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Preliminary Information
The following information details the structure of, and information contained in, the Electrical Diagnostic Manual
(EDM). The manual is designed t o provide diagnostic information on all major electrical systems fitted t o 1995MY
Sedan Vehicles. Where diagnostics require major component removal or overhaul, reference will be made to the
relevant sections of the Vehicle Service Manual (VSM) and Unit Service Manuals (USM) as necessary.
Manual Structure
The manual structure is closely aligned t o the VSM in both sectional arrangement and numbering. Each section o f t h e
EDM is intended t o complement the corresponding VSM section by providing detailed diagnostic procedures designed
t o resolve faults which may be discovered during general maintenance or vehicle use.
Manual Content
Manual content consists of individual system sections each divided into the following subsections:
0 System Description: A brief description of h o w each system operates, h o w faults are identified and logged and
the location and function of each system component.
0 Component Description: Detailed descriptions of each system component giving relevant data and
specifications.
0 Diagnostic Fault Codes: List of all fault codes with explanatory information and potential causes / remedies.
0 Symptom Flow Charts: Logical ‘flow diagram’ type fault diagnosis, where applicable, or descriptive system
testing.
0 Diagnostic Subroutines: Detailed information o n specific areas identified in Symptom Flow Charts.
0 Pin Point Tests: Exact locations of test points for faulty areas identified during fault diagnosis.
HOW TO USE THIS MANUAL
This manual is intended to be used in conjunction with the VSM t o identify and correct electrical faults within the
vehicle‘s systems. Each section is designed to explain and diagnose system faults in a logical, concise manner t o
reduce maintenance repair time. The method of extracting fault codes from the various electronic microprocessor
modules vary between systems and each method is detailed in its section. All systems with fault codes conforming
t o CARB OBDll legislation have codes accessible by a hand-held scan tool. All system codes are accessible using
Jaguar Diagnostic Equipment, ie Portable Diagnostic Unit.
The manual has been divided between three covers, as detailed below:
Cover
1
2
3
3
3
3
3
3
Section Number
5.1
52
8.1
8.2
10
12
14
15
Section Title
Fuel, Emission Control and Engine Management (AJ16)
Fuel, Emission Control and Engine Management (V12)
Automatic Transmission (AJl6)
Automatic Transmission (V12)
Steering
Brakes
Climate Control Systems
Electrical
Circuit diagrams are contained in cover 3, following Section 15.
An index to this manual can be found at the rear of cover 3.
X300 EDM
1
Issue 2 June 1995
Introduction
This glossary of terms is intended to cover both general and emissions-related (to SAE J 1930)terminology. It is intended t o enable the user to ascertain the meaning of standardized terms and acronyms used throughout the Manual.
The required term may be looked-up in the left-hand column, and subsequent columns givethe standard abbreviation
or acronym, definitions and previously used terms, as applicable.
As this Manual is a world-wide publication, and must comply with certain Society of Automotive Engineers Standards,
it has been necessary to adopt the terminology etc. demanded by that Standard.
Term(s)
I
Abbreviation
(if applicable)
Definition
Previously used
term(s) (or English Equivalent)
A
AP
AF
throttle pedal
measurement across the spanner flats of a
nut or bolt head
adaptor
after top dead center
ABDC
ATDC
41RBAG 1 SRS
ACL
NC
ACS
I
Air Conditioning
Air Conditioning Signal
Air Conditioning Control Module
NCCM
airfoil
I
alternating current
ac
I aluminum
Ambient temperature
Ampere
Ampere hour
Anti-Lock Braking System
ABS I traction control control
A
Ah
ABS
AC, aircon
air
conditioning
compressor
clutch
operation is signalled to the PCM which
induces
idle
speed
corrections
to
compensate for engine load changes
module controlling air conditioning, heating
and ventilation
wing or similar, designed to obtain some aerofoil
effect from the flow of air over it
electrical current whose flow alternates in
direction, in a sinusoidal wave-form
aluminium
Temperature of the air surrounding an object
SI unit of current
Amp
1 Ampere flowing for one hour
Amo. hour
system, usually electronically controlled (but
can be mechanically) which prevents wheel
lock-up under braking by sensing lack of
rotation of a wheel(s) and diverting fluid
pressure away from it (them). Originally
Anri-Blockier System (Bosch).
ABS CM
ABS 1 TC CM
module
aerial
antennas)
analog
Analog Volt-Ohm meter
I atmomheres
automatic transmission
Issue 2 June 1995
analogue
AVO M
atm
unit of Dressure (1.01325 bar)
auto,
auto gearbox
shaft transmitting power to the rear wheel drive shaft
hubs
2
X300 EDM
i
Introduction
Term(s)
Abbreviation
(if applicable)
Previously used
term(s) (or English Equivalent)
Definition
white metal
backlight,
rear screen
reversing lamp
Babbitt metal
backlight
back-up lamp
balk ring
BARO
rotating component of manual transmission baulk ring
which prevents premature engagement of
gears
The positive Voltage from a battery or any B+, +ve, VSS
circuit connected directly t o it.
sensor
measuring the
pressure of BARO, APS
surrounding air at any given temperature
and altitude
Idle rpm determined by the throttle lever
being hard-set on the throttle body with the
IAC solenoid disconnected
before bottom dead center
before top dead center
blower
BBDC
BTDC
BLR
Body Processor Module
BPM
Spark advance in degrees before top dead
center of the base engine without any control
from the PCM
Electrical storage device producing DC
Voltage by means of electrochemical
reaction
event occurring before BDC
event (usually ignition) occurring before TDC
Device which supplies a current of air at
moderate pressure, e.g. heater or N C blower
(Central
Control module for body electrical systems, CCM
e.g. interior lamps, windshield wash / wipe Control Module).
CPU
control etc..
standard specification issued by the British
Standards Institution
B+
battery positive Voltage
Barometric Absolute
Sensor
Pressure
base Idle
base timing
battery
British Standards
BS
British Standards Automotive
BSAu
bhP
effective horsepower developed by an
engine or motor, as measured by a brake
applied to its output shaft
brake mean effective pressure
BMEP
that part of the effective pressure developed
in a cylinder that would result in a cylinder
output equal to the bhp of the engine
brake on/off
brake rotor
break-in, breaking-in, wearing-in
BOO
indicates the position of the brake pedal
bottom dead center
BDC
bypass air
BPA
brake horsepower
bumper guard
bushing
X300 EDM
brake disc
process of bedding-in the internal working running-in
surfaces of e.g. an engine by avoiding excess
build-up of heat
I
I
lowest point of piston travel in
reciprocating engine
mechanical control of throttle bypass air
I
I cylindrical plain bearing
3
a
overrider
bush
Issue 1 August 1994
(if applicable)
term(s) (or English Equivalent)
C
I
camshaft
Camshaft Position Sensor
a shaft on which phased cams are mounted.
Usually used t o regulate opening and closing
of engine cylinder head valves
CMP
CMPS
canister
Canister Purge
Carbon Dioxide
CANP
CO2
Canadian Motor Vehicle Safety
Standard
caster
CSE GND
CID sensor,
Hall sensor
device designed t o hold dry material, e.g.
evaporative emission canister
controls purging of the EVAP canister
colorless gas with a density of approximately
1.5 times that of air
poisonous gas produced as the result of
incomplete combustion
I Control module casing ground
inclination of the plane of a wheel to the
vertical plane of the vehicle. May be negative
or positive.
Also convex curvature across road surface
CMVSS
C
center
centimeters
charge current
Closed Loop
Closed Loop System
indicates camshaft position
I
Carbon Monoxide
Case Ground
camber
I
cm
CLS
I---P
clutch disc, clutch disk
clutch throwout bearing
color
trail built in to the geometry of a steered caster, castor
roadwheel to give it a caster - self-steering effect
in-line exhaust system device used to reduce
the level of engine exhaust emissions
SI term for the Centigrade scale, with freezing
point at zero and boiling point at looo
centre
centimetres
1
charging current
I current developed by the generator
I
control system with one or more feedback
loops
device which uses mechanical, magnetic or
friction type connections t o facilitate
engaging or disengaging two shafts or
rotating members
clutch plate,
friction disc of a clutch assembly
centre plate,
driven plate
bearing mounted on clutch throw-out fork, clutch release
which depresses the pressure plate’s bearing
diaphragm spring to release the clutch disc
colour
C/M CM
connecting rod bearing
Issue 1 August 1994
bearing (usually split, plain) at the lower end big end bearing
of the connecting rod where it connects with
the crankshaft
4
X300 EDM
t
Introduction
GLOSSARY OF TERMS
CM
Control Module
convertible top
countershaft
I
Crankshaft Position
Crankshaft Position Sensor
CKP
CKPS
Crankshaft Position Timing Ring
Crankcase Ventilation System
CKPTR
cv
I
cubic centimeters
cm3
I
curb weight
Previously used
term(s) (or English Equivalent)
a means or device to direct and regulate a
process or guide the operation of a machine,
apparatus or system
Control
cotter pin
Definition
Abbreviation
(if applicable)
TermM
a
self-contained
group
of
electrical/electronic components, designed
as a single replaceable unit, and controlling
one or more processes as above
flexible, usually fabric, roof of an open
(convertible)vehicle
shaft, carrying pinions, running parallel to
the mainshaft in a transmission unit
split pin which is used as a locking device for
a castellated nut, etc.
hood,
convertible hood
layshaft
split pin,
cotter pin
~~~~
generates crankshaft position information in
conjunction with the CKPTR (also generates
speed information in certain applications)
toothed ring which triggers the CKPS
system which scavenges camshaft cover and
crankcase emissions and feeds them into the
inlet manifold.
cubic
centimetres
weight of vehicle with fuel, lubricants and kerb weight
coolant, but excluding driver, passengers or
payload
thin-walled, hard metal cylinder inserted into cylinder liner
the cylinder block of an engine, and in which
the piston runs
T
cylinder sleeve, sleeve
X300 EDM
5
Issue 1 August 1994
Term(s)
Abbreviation
(if applicable)
Definition
Previously used
term(s) (or English Eauivalent)
D
I change down
downshift
draft
drivability
driveshaft
/ draught
longitudinal shaft transmitting power from
transmission output to rear axle differential
tunnel in floor abovethe driveshaft (propeller
shaft)
cylinder sleeve which is not in contact with
coolant
engine configuration with two camshafts
positioned above the valves
(US)Fact or group of facts.
driveshaft tunnel
dry sleeve
Dual Overhead Cam
DOHC
Data
Data Link Connector
DLC
Data OutDut Line
DOL
defogger, backlight defogger
I
connector providing access and/or control of
the
vehicle
information,
operating
conditions, and diagnostic information
circuit that sends certain information from
the PCM to the instrument cluster
driveability
propeller shaft
transmission
tunnel
dry liner
(English) Group
offacts (i.e. plural
of datum)
I HRW, rear screen
heater, demister
degree (angle or temperature)
DeDartment of TransDortation
(US,
.~ ~,
Department of Transport (UK)
Deutsche lnstitut fur
Normung
diameter
Diagnostic Module
deg, O
DOT
Diagnostic Test Mode
DTM
Diagnostic Trouble Code
DTC
DTP
DIN
dia
DM
differential housing
differential pressure
Differential
EGR
Pressure Feedback
DPFE
German Standards regulation body
Supplemental
Restraint
System
(non-controlling) module for diagnostics
overview
a level of capability in an OBD system. May
include different functional states to observe
signals, a base level to read DTCs, a monitor
level which includes information on signal
levels, bi-directional control with on/off
board aids, and the ability to interface with
remote diagnosis
an alphahumeric identifier for a fault
condition identified by the On-Board
Diagnostic (OBD) system
rotating housing (in a bevel differential)
attached to the crownwheel, carrying the
final drive oinions
pressuredifference between two regions e.g.
between intake manifold and atmospheric
pressures
an EGR system that monitors differential
EGR pressure across a remote orifice to
control EGR flow
dimmer switch
Issue 1 August 1994
Self Test Mode
Self Test Code.
Fuel Fail code
differential cage
dip switch,
dipper switch
6
X300 EDM
Term(s)
Abbreviation
Definition
term(s) (or Eng-
i
direct current
dc
disk, disc
Distributor Ignition
Distributor Ignition Cap
Distributor Ignition Carbon Brush
DlCB
Distributor Ignition Leads
Distributor Ignition Rotor Arm
DIL
DIRA
X300 EDM
current which flows in one direction only,
though it may have appreciable pulsations in
its magnitude
7
disc
I
I
arm
I
I
Issue 1 August 1994
I
Id
Introduction
w
GLOSSARY OF TERMS
Term(s)
Abbreviation
(if applicable)
Definition
Previously used
term($) (or English Equivalent)
E
Exhaust Gas Recirculation
EGR
EGR Temperature
EGRT Sensor
EGR Vacuum Regulator
EGRT
EVR
EGR Valve Position
EVP
Electrical Diagnostic Manual
EDM
System which reduces NOx emissions by EGR
adding exhaust gases to the incoming
fuel/air charge
Sensing EGR function based o n temperature
change.
controls EGR flow by changing vacuum to
the EGR valve
an EGR system that directly monitors EGR
valve position to control EGR flow
Manual which deals with the diagnosis of
electrical faults (see also Vehicle Service
Manual and Unit Service Manual)
EEPROM,
E2PROM
EPROM
Electrically Erasable Programmable Read-Only memory
EIect rica Ily Programmable
Read-Only memory
Electronic Engine Control
EEPROM
Electronic Secondary Air Injection
EA1R
Engine Control Module
Engine Coolant Level
ECM
ECL
Engine Coolant Temperature
ECT Sensor
ECT
ECTS
Engine Speed
Engine Speed Sensor
RPM
Environmental Protection Agency
Evaporative Emission
EPA
EVAP
Evaporative Emission Control
Valve
Exhaust Gas Recirculation
Solenoid Vacuum Valve
Exhaust Gas Recirculation
Temperature Sensor
Exhaust Gas Recirculation Valve
Extreme Pressure
EVAPP
purge valve
EGRS
EGR
solenoid
valve
EGR temperature
sensor
Issue 1 August 1994
EPROM
EEC
a system that provides electronic control of
eng ine electronics
a pump-driven system for providing
secondary air using an electric air pump
ECU
engine coolant
level indicator
temp.
thermistor which provides engine coolant Coolant
temperature signal t o the PCME to trigger sensor, ECT
enrichment circuits which increase injector
‘on’ time for cold start and warm-up
rev/min, RPM
sensor fitted o n flywheel of V I 2 engine;
provides engine speed information
system designed t o prevent fuel vapor from
escaping into the atmosphere. Typically
includes a charcoal filled canister t o absorb
fuel vapor
EGRT Sensor
EGRV
EP
additives to drive axle lubricants. Designed
to protect the spiral bevel gears from wear
induced by their sliding/rolling action
8
X300 EDM
i
Introduction
GLOSSARY OF TERMS
Definition
Abbreviation
(if applicable)
Term(s)
FC
Fan Control
Fascia
farad
Previously used
term(s) (or English Equivalent)
engine cooling fan control
fascia, facia
F
SI unit of electrostatic capacitance; more
usually subdivided t o microfarad
FMVSS
Federal Motor Vehicle Safety
Standard (US)
fender
wing,
I (also tonneau)
I fihrn
I
bulkhead,
dash panel
firewall
I
1
1
i
:1
Flash Electrically Erasable Programmable Read-only Memory
Flash Erasable Programmable
Read-only Memory
Flywheel Sensor
I
FEEPROM
I
FEPROM
I
CKFS
flywheel ring gear tooth t o give an engine
fueling
Fuel Injectors
Y
FI
Fuel Pressure Regulator Control
FPRC
Fuel Pump
Fuel Pump Monitor
Fuel Pump Relay
fuel rich/lean
FP
FPM
FPR
X300 EDM
solenoid operated devices that spray a fuel injectors,
metered quantity of fuel into the inlet ports injectors
controls fuel pressure regulator; used
primarily t o give extra fuel at cold start-up
monitors operation of fuel pump
qualitative evaluation of airfluel ratio based
o n a ratio known as stoichiometry, or 14.7:l
(Lambda1
9
Issue 1 August 1994
Term(s)
Abbreviation
(if applicable)
Definition
Previously used
term(s) (or English Equivalent)
G
gauge (gage also used, but not
preferred)
gasoline
gauge
petrol,
I petroleum spirit
I petrol
gas tank
gear cluster
gearshift (lever), shift lever
generator
GEN
Gramme centimeter
Grammes (force)
Grammes (mass)
ground
gcm
gf
g
GND
Issue 1 August 1994
tank, fuel
tank
Iayshaft
gear lever
rotating machine which converts mechanical alternator
energyinto electrical energy
electrical conductor used as a common re- earth
turn for an electrical circuit or circuits, and
with a relative zero potential
10
X300 EDM
Term(s)
Abbreviation
(if applicable)
Definition
Previously used
term(s) (or English Equivalent)
I
Idle Air Control
Idle Air Control Valve
idle speed convolume of air by-passing the throttle to trol actuator, idle
maintain the programmed idle speed
air bypass control, idle speed
control valve
device which amplifies the ignition system
ignition amplifier
OUtDUt
ignition ground
Inertia Fuel Shut-off
IGN GND
an inertia system that shuts off the fuel
supply when activated by predetermined
force limits brought about by (e.g.) collision
shuts down fuel and ignition systems in the inertia switch
event of a vehicle imDact
inlet
air drawn through a cleaner and distributed
to each cylinder for use in combustion
temperature of intake air
device used to measure IAT
ACT, airtemperature sensor, MAT,
ATSD. VAT. TBT
thermistor which signals the ECM to retard
the ignition timing in response to high inlet
air temperatures
thermistor which inputs air density
information to the ECM
Inertia Fuel Shut-off Switch
intake
Intake Air
Intake Air Temperature
Intake Air Temperature Sensor
IAT
IATS
Intake Air Temperature Sensor
Ignition
IATSl
Intake Air Temperature Sensor
Iniection
internal diameter
International Standards Organization
interrupter
IATSF
i.dia
IS0
interruptor
J
iumDer cable
Issue 1 August 1994
I
I
I iumD lead
12
X300 EDM
I lish Equivalent)
K
kilogrammes (mass)
kilogrammes (force)
kilogrammes force per square
centimeter
kiIometers
' kilometers per hour
kilopascals
kilovolt
knock
~
knock sensor
k9
kgf
kgf/cm2
km
kmlh
kPa
kV
KS
kilometres
km/h, kph
the sharp metallic produced sound when two
pressure fronts collide in a combustion
chamber (see also ping)
sensor which detects the onset of detonation
and signals the ECM t o retard the ignition
L
1 wheel nut
1 lug nut
X300 EDM
13
Issue 1 August 1994
Term(s)
Abbreviation
(if applicable)
Definition
Previously used
term(s) (or English Equivalent)
M
Malfunction Indicator Lamp
Manifold Absolute Pressure
Manifold Absolute Pressure Sensor
Manifold Surface Temperature
manual transmission,
transmission
Mass Air Flow
MAP
MAPS
Mass Air Flow Sensor
MAFS
maximum
metal inert gas
max.
MIG
meters (measurement)
metric (screw thread, e.g. M8)
Microfarad
m
M
MFD
millimeters
millimeters of mercurv
minimum
minute
Model Year
Module
mold
Motorized In-Car Aspirator
a required on-board indicator t o alert the fuelling failure
driver of an emission related malfunction
absolute pressure of the intake manifold air
sensor located in the PCM and ported to the
intake manifold
MIL
M ST
Mfl
MAF
I
I
I
I
mm
mmHa
min.
minute
MY
M
transmission which is manually, externally gearbox
controlled
system which provides information on the
mass flow rate of the intake air t o the ennine
1 hot-wire sensor which monitors air flow into air flow meter
the intake manifold for fueling and ignition
control
electric welding system in which a stream of
inert gas shields the electrode, preventing
oxidation
metres
unit of electrical capacitance, one millionth of
a farad
I
I
I
I
self contained group of electrical/electronic
components which is designed as a single
replaceable unit
MIA
muffler
multiport fuel injection
Issue 1 August 1994
MFI
min.
I
mould
device which constantly samples cabin motorized
temperature by passing air over a sensor, rator
and communicates with the A/CCM to modify
A/C system performance to suit
device which causes exhaust gas flow t o silencer
expand and thereby reduce its pressure and
hence its noise
14
aspi-
X300 EDM
National Institute of Occupational
Safety & Health (US)
Newton
Newton meters
NIOSH
N
Nm
Nitrous Oxides
Non-Volatile Random
Memow
normally aspirated
NOx
Access
NVRAM
Normally Closed
Normally Open
North American Specification
NC
NO
NAS
1 octane number
i Occupational Safety & Health I
Ad minist rat ion (US)
odometer
oil gauge, oil gage
oil pan
oil passage
On-Board Diagnostic
-
I measure ofthe anti-knock properties of afuel
open circuit
OEM
OHC
oc
NOx
02s
oxides of nitrogen
Oxygen Sensor
X300 EDM
instrument which records the total mileage mileometer
covered by a vehicle
dipstick
sump, oil sump
oilway
I a system that monitors some or all computer
input and output control signals. S i g n a h )
outside the pre-determined limits imply a
fault in the system or a related system
a circuit which does not provide a complete
path for flow of current
0.dia
Oxidation Catalytic Converter
I
vehicles for sale in the USA and Canadian
OSHA
OBD
oriainal eauioment manufacturer
outside diameter
overhead camshaft
SI unit of force. 1 N = 0.2248 pounds force
SI unit of torque. Must not be confused with
nm (nanometer)
compounds of nitrogen and oxygen formed
Major source of
at high temperatures.
exhaust-gas air-pollution
RAM which retains memory even if power
supply is interrupted
fueling system using intake air at
atmospheric pressure; not supercharged or
turbocharged
I
engine configuration with single camshaft
positioned above the valves
catalytic converter system that reduces cat, OC
levels of HC and CO
a sensor which detects oxygen content in the EGO, 0 2 EOS,
EGS, OS, EGOS,
exhaust gases
Lambda Sensor
I
15
issue 1 August 1994
II
P
paragraph
parking brake
Park Neutral Position
Park Neutral Position Switch
para
handbrake
PNP
PNPS
indicates the selected non-drive modes of NDS, NGS, TSN,
gearbox sensor
the (automatic) transmission
boss in the piston wall (two per piston) which piston pin boss
is bored to accept one end of the piston pin
metallic pinging sound caused by detonation pinking
in the combustion chamber, usually caused
by incorrect grade of fuel (too low octane) or
over-advanced ignition timing (see also
knock)
I
piston pin (also wrist pin)
pin which connects the connecting rod to the gudgeon pin
piston, and permits articulation between the
two.
Dower steerina
hvdraulic DumD-assisted steerina svstem
power assisted steering
power steering pressure
powertrain
the elements of a vehicle by which motive drive line
power is generated and transmitted to the
driven axle
sequence of events to be performed by a programme, procontrol module/computer
I
programable or programmable I
programed or programmed
I programer or programmer
I
programing or programming
Proarammable Electronic Control I
Units System
programming
PECUS
process whereby a common ECM is
programmed on the production line to suit
the market requirements of a particular
vehicle
Programmable Read-only Mem-
ROM with some provision for setting the
stored data after manufacture
enai neer's blue
Prussian blue
device used to raise, transfer, or compress
fluids by suction, pressure or both
drain plug, drain
purge cock
tan
Issue 1 August 1994
16
X300 EDM
-
..
I lish Equivalent)
0
R
Radio Data System
RDS
Random Access Memory
RAM
Read-only Memory
ROM
rear wheel drive
relay
RWD
relay module
reservoir
RTN
RPM
return
revolutions per minute
right-hand
riaht-hand drive vehicle
1 rocker Dane1
I roof lining
local traffic information service which
automatically breaks in to whichever station
is being received. Also programmable to
lock onto the strongest available frequency
for a given nationally available radio station,
regardless of the geographical location of the
receiver
fast access memory store which is accessible
for entry or extraction of data
fast access memorv in which data is fixed and
may not be entered or extracted
I
an (usually) electro-mechanical device in
which connections in one circuit are opened
or closed by changes in another circuit
a module containing two or more relays
container, usually for oils, coolants or
hydraulic fluids
a dedicated sensor ground circuit
shaft-speed of a device, usually an engine or
motor
RH
RHD
door sill, sill
head lining
I
I
0
0
X300 EDM
17
Issue 1 August 1994
Term(s)
Abbreviation
(if applicable)
Definition
ST
device
that
interfaces
with
and
communicates information o n a data link
module controlling the seat motor systems
(not electric raise/lower-only seats)
air provided to the exhaust system
system used for a period of time each time
the engine is started, unless certain
temperature criteria are met. Pumps air
directly into the exhaust system which
generates extra heat and reduces the time
taken for the catalytic converters t o reach
operating temperature
vents secondary air t o atmosphere
valve which prevents back-flow of exhaust
gas to the AIR system when the system is
inoperative
diverts secondary air to either the catalyst or
exhaust manifold
clutch mounted o n the AlRP drive shaft
Previously used
term(s) (or English Equivalent)
S
Scan Tool
Seat Control Module
SCM
Secondary Air
Secondary Air Injection
AIR
Secondary Air Injection Bypass
Secondary Air Injection Check
Valve
AlRB
AlRC
Secondary Air Injection Diverter
AlRD
Secondary Air Injection Magnetic
Clutch
Secondary Air Injection Pump
AIRPC
Secondary Air Injection Relay
AlRR
Secondary Air Injection Switching
Valve
Security & Locking Control Module
sedan
AIRS
AlRP
Service Bulletin
Service Manual
S
I
SB
SM
SMPIB
formation Bulletin
SRO
(number)
Issue 1 August 1994
NRV, non-return
valve
air pump clutch
mechanically driven rotary vane pump, AIP, air pump
driven through the AIRPC
controls the injection of air into the exhaust air injection relay
system
vacuum operated valve backing-up the AlRC air
switching
valve
module controlling the vehicle's security and
closure-lockina functions
passenger car having t w o or four doors, and saloon
front and rear seatsfor driver and passengers
generic name for a device that senses either
the absolute value or a change in a physical
quantity such as temperature, pressure or
flow rate, and converts that change into an
electrical auantitv sianal
SLCM
Sensor
AIP, AI, Thermac,
air injection system
I
form of Service Bulletin specifically designed
t o enable the rapid issue of temporary pages
for inclusion in the Service Manual
Number generated by Jaguar Methods &
Techniques system which relates t o the time
allowed t o complete a repair operation.
Further information o n the system can be
found in the separate Jaguar Publications
(for each model range) entitled 'Repair
Operation Times'.
18
X300 EDM
i
Introduction
GLOSSARY OF TERMS
Term(s)
Previously used
term(s) (or English Equivalent)
part of the shift mechanism of a manual selectorfork
transmission, mounted on the shift rail, and
relaying movement in the shift lever to the
sleeve coupling
.
- which moves gears in and
out of engagement
selector rod
rail which carries the shift fork
controls
shifting
in
an
automatic
transmission
part engine, usually the cylinder block, short engine
crankshaft I connecting rod I piston
assembly, supplied as a reconditioned unit
an undesirable connection between a
(usually electrical) circuit and any other point
in-line engine which is mounted in the inclined engine
vehicle at an angle from the perpendicular, as
AJ 6
sun roof
sun roof control
module
Abbreviation
(if applicable)
Definition
shift fork
I
' shift
rail
shift solenoid
ss
short block
I
short circuit
~
slant engine
, sliding roof
0
' sliding roof control module
SRCM
SIG RTN
, signal return
circlip
buffer block, usually of a rubber compound, bump stop
which fits between the axle and the body unit,
and absorbs any excess travel
snap ring
snubber
Society of Automotive Engineers
solenoid
SAE
device consisting of an electrical coil which,
when energized, produces a magneticfield in
a plunger which is pulled to a central
position. A solenoid may be used as an
actuator in a valve or switch
mud flap
the magnitude of velocity (regardless of
direction)
Module controlling Speed Control System
Cruise
Control
Module (CCM)
splash guard
speed
SCCM
Speed Control Control Module
square centimeters
stabilizer bar
0
cm'
torsion bar across the vehicle, connecting anti-roll bar
bodv and susDension
standard
station wagon
I
stoD lamD
sulfur, sulfuric
supercharger
I
Supercharger Bypass
supply Port
std
sc
SCB
SP
I
I
I
II
estate car, shootina brake
brake lamp
sulphur, -ic
an intake system which utilizes a
supercharger (mechanically driven device
that pressurizes intake air,thereby increasing
density of charge air and the consequent
power output from a given displacement)
supply port of valve
e
X300 EDM
19
Issue 2 June 1995
i
Introduction
GLOSSARY OF TERMS
Term(s)
Abbreviation
(if applicable)
switch
synchromesh
synchro
I
system
Issue 1 August 1994
Definition
term(s) (or Enalish Eauivalentl-
I
device for making, breaking or changing the
connections in an electrical circuit
manual transmission mechanism consisting
of a cone shaped clutch inside a coupling
sleeve which ensures that the sleeve and the
gear are turning at the same speed as they
mesh
group of interacting mechanical or electrical
components serving a common purpose
20
X300 EDM
i
Introduction
GLOSSARY OF TERMS
0
Term(s)
Abbreviation
(if applicable)
tachometer
TACH
Thermal Vacuum Valve
TVV
Three-way Catalytic Converter
TWC
Three-way
Converter
+ Oxidation
Catalytic
TWC + OC
Throttle
0
Throttle Body
Throttle Position
Throttle Position Sensor
TB
TP
TPS
throw-out bearing
throw-out fork
Definition
Previously used
term(s) (or English Equivalent)
a circuit that provides input for an electronic
tachometer display
controls vacuum levels or routing based on
temperature
catalytic converter that reduces the levels of cat
HC, CO & NOx
catalyticconverter system that has both TWC cat, dual bed
and OC. Usually secondary air is introduced
product is measured under various
conditions
a valve for regulating the supply of a fluid,
usually air or an air/fuel mixture, to an engine
device containing the throttle
interprets throttle position and movement t o Throttle potenidentify idle, acceleration and full-power tiometer, TPS, TP
demands
clutch
release
bearing
clutch
release
lever
track rod
tie-rod (steering)
timing
relationship between spark plug firing and
piston position, usually expressed in
crankshaft degrees BTDC or ATDC of the
comDression stroke
tyre
tire
top dead center
torque converter
TDC
Torque Converter Clutch
TCC
device which, by its design, multiplies the
torque in a fluid coupling between an engine
and transmission
Transmission
Transmission Control Module
TCM
Transmission Control Switch
TCS
Transmission Oil Temperature
Transmission Range
TOT
TR
Transmission Speed Sensor
TSS
tread
trunk
turn indicator, turn signal lamp
two cycle
X300 EDM
TCC, CCC, CCO,
LUS,
MLUS,
MCCC
device which selectively increases or
decreases the ratio of relative rotation
between its input and output shafts
controls the shifting pattern of the transmission
ECU
(automatic) transmission
Modifies the operation of electronically
controlled transmissions
indicates temperature of transmission fluid
the range in which the transmission is
operating
indicates rotational speed of transmission
output shaft or turbine shaft
track between tire contact centers; not to be track
confused with tire contact tread Dattern
boot,
luggage
compartment
direction indicator
principle of engine which fires every second two stroke
stroke of the Diston
21
Issue 1 August 1994
I
U
I underseal
undercoating
unitized construction
I
unitary construction
Unit Service Manual
'unit' (e.g. transmission, engine) fitted t o a
Jaguar vehicle (see also Vehicle Service
Manual and Electrical Diagnostic Manual)
V
a device by which the flow of liquid, gas,
vacuum or loose materials may be started,
stopped or regulated by a movable part
which opens, shuts or partially obstructs one
or more passageways or ports. A 'Valve' is
also the movable part of such a device
in an OHC engine, the plunger fitted between :appet, bucket
valve stem and cam lobe
valve
valve lifter
vapor
Vehicle Condition Monitor
Vehicle
Emission
Information Label
Vehicle Service Manual
Control
VCM
instrument panel display which warns of
faults
VECl Label
VSM
Service Manual which pertains t o a specific
family of Jaguar vehicles (see also Unit
Service Manual and Electrical Diagnostic
vss
sensor which provides vehicle speed
information
number assigned to the vehicle by the
manufacturer, primarily for licensing and
identification ourooses
I
Manual).
Vehicle Speed Sensor
7Vehicle Identification Number
VI N
VI
I Voltage Regulator
Issue 1 August 1994
VR
(1) vaporizing at room temperature (liquid)
(2) not permanent (memory)
device which regulates the variable output
voltage of a generator
22
X300 EDM
Introduction
GLOSSARY OF TERMS
-
Warm-up
Converter
Oxidation
-
-
IArbb
_.
tion I
(if applicable)
Terrnls)
..
Catalytic
WU-OC
Warm-up Three-way Catalytic
Converter
WU-TWC
watts
wet sleeve
wheelslip
Wide ODen Throttle
windshield
wrist pin (also piston pin)
W
nitiion
1
luslv used
term(s) (or English Equivalent)
catalytic converter system designed to lower
HC and CO emissions during the warm-up
period. Usually located in or near the
exhaust manifold
catalytic converter system designed to lower
HC, CO and NOx emissions during the
warm-up period. Usually located in or near
the exhaust manifold
SI unit of power (1 hp = 745.7 watts)
thin walled hard metal cylinder supported at wet liner
cylinder head and crankshaft ends; in contact
with coolant
wheelspin
Ifull throttle Dosition
windscreen
pin which connects the connecting rod to the gudgeon pin
piston, and permits articulation between the
two.
I
WOT
I
XYZ
X300 EDM
23
Issue 1 August 1994
24
Fuel, Emission Control & Engine Management (AJ16)
SECTION CONTENTS
Sub-Section
SRO
Title
Page
. . . . . . . . . . . . . . . . . . Prliminary Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
5.1 . . . . . . . . . . . . . . Fuel, Emission Control & Engine Management ............................................
1
5.1.1 . . . . . . . .
. Introduction ......................................................
. . . . . . . . . . . . . . . .1
.....................
1
. . . . . . . . . . . Diagnostic Codes ............................................
. . . . . . . . . . . On-Board Diagnostics II ..............................................................
1
5.7.7.3 . . . . .
. Catalyst Monitoring ..................................................................
1
5.1.1.4 . . . . . .
. Misfire Monitoring ............................................................
5.1.7.5 . . . . . . . . . . . Exhaust Gas Recirculation (EGR) Monitoring ..........................
. . . . . . . . . . . . . . .2
5.7.1.6 . . . . . . . . . . . Secondary Air Injection Monitoring . . . . . . . . . . . . . . . .
................................. 2
5.7.2 . . . . . . . . . . . . . Component Description . . . . . .
..................................................... 3
5
5.1.2.1 . . . . . . . . . . . Component Location Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.2.2 . . . . . . . . . . . Engine Management Control Module - Pin Details ........................................
7
5.1.2.3 . . . . . . . . . . . Transmission Component Location Diagrams .............................................
8
5.1.2.4 . . . . . . . . . . . Transmission Control Module (ZF 4HP 24 E) - Pin Details ..................................
9
5.1.3 . . . . . . . . . . . . . Diagnostics . . . . . . . . . . .
........................................................
10
5.1.3.1 . . . . . . . . . . . Data Link Connector . . .
........................................................ 10
5.1.4 . . . . . . . . . . . . . Data Stream Information .............................................................
71
5.1.4.1 . . . . . . . . . . . Parameter Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
5.1.4.2 . . . . . . . . . . . Freeze Frame Data ..................................................................
12
5.1.4.3 . . . . . . . . . . . Generic Scan Tool . . . . .
........................................................ 12
12
5.1.4.4 . . . . . . . . . . . Oxygen Sensor Monitoring Test Results .................................................
Note: Due to the complexity of component diagnostics the symptom charts 1 pin point tests have been collated in
5.7.1.7
5.7.1.2
group and 'P' code order; their listing commences on page ii.
X300
EDM
I
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
DIAGNOSTIC FAULT CODES
FUEL AND AIR METERING
Page no.
GROUP 1
P 0101
P 0102
P 0103
GROUP 2
PO112
PO113
MASS AIR FLOW SENSOR - MAFS
MAF circuit range / performance
MAF circuit low input
MAF circuit high input
Remove / Refit
MIL
Y
Y
Y
GROUP 4
P 0121
P 0122
P 0123
GROUP 5
P 0131
P 0132
P 0133
P 0137
P 0138
P 0139
P 1137
P 1138
P 0151
P 0152
P 0153
P 0157
P 0158
P 0159
P 1157
P 1158
Issue 2 June 1995
13
85
86
87
16
-
17
INTAKE AIR TEMPERATURE IAT
IAT circuit low input
IAT circuit high input
Remove / Refit
Y
Y
88
88
19
-
PO116
P 01 17
P 01 18
P 0125
Diagnostic
chart page
no.
20
ENGINE COOLANT TEMPERATURE ECT
ECT circuit range / performance - falling temperature
ECT circuit low input
ECT circuit high input
Excessive time to enter closed loop fuel control
Remove / Refit
Y
Y
Y
Y
THROlTLE POSITION - TP
TP circuit range / performance
TP position circuit low input
TP position circuit high input
Remove / Refit
Y
Y
Y
89
90
91
92
24
25
93
94
95
28
HEATED OXYGEN SENSOR - H02S
Bank 1 Sensor 1
0 2 sensor circuit low voltage
0 2 sensor circuit high voltage
0 2 sensor circuit slow response
Bank 1 Sensor 2
0 2 sensor circuit low voltage
0 2 sensor circuit high voltage
0 2 sensor circuit slow response
Lack of 0 2 switch, indicates lean
Lack of 0 2 switch, indicates rich
Bank 2 Sensor 1
0 2 sensor circuit low voltage
0 2 sensor circuit high voltage
0 2 sensor circuit slow response
Bank 2 Sensor 2
0 2 sensor circuit low voltage
0 2 sensor circuit high voltage
0 2 sensor circuit slow response
Lack of 0 2 switch, indicates lean
Lack of 0 2 switch, indicates rich
Remove / Refit
29
96
97
98
Y
Y
Y
99
100
101
102
103
96
97
98
Y
Y
Y
99
100
101
102
103
34
ii
X300 EDM
Fuel, Emission Control
Engine Management
Page no.
0
MIL
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
GROUP 6
P 0171
P 0172
P 0174
P 0175
P 1171
P 1172
P 1176
P 1177
P 1178
P 1179
ADAPTIVE FUEL
System too lean - bank 1 - reduced flow
System too rich - bank 1 - excess flow
System too lean - bank 2 - reduced flow
System too rich - bank 2 - excess flow
Lean fuelling - banks 1 & 2
Rich fuelling - banks 1 & 2
Lean fuelling trim, long term (FMFR)
Rich fuelling trim, long term (FMFR)
Lean fuelling trim, long term (AMFR)
Rich fuelling trim, long term (AMFR)
GROUP 7
P 1191
P 1192
P 1193
P 1194
P 1195
P 1196
HEATED OXYGEN SENSOR - H02S (HEATER)
Banks 1 & 2 Sensor 1
0 2 sensor heater olc
0 2 sensor heater slc
0 2 sensor heater - olc - inferred
0 2 sensor heater - resistance
0 2 sensor heater circuit low resistance
0 2 sensor heater - low resistance
Banks 1 & 2 Sensor 2
0 2 sensor heater olc
0 2 sensor heater slc
0 2 sensor heater - olc - inferred
0 2 sensor heater - resistance
0 2 sensor heater circuit low resistance
0 2 sensor heater downstream - low resistance
GROUP 8
P 1199
FUEL LEVEL
Fuel level input circuit (This group is not active)
GROUP 9
PO201
P 0202
P 0203
P 0204
P 0205
P 0206
P 1201
P 1202
P 1203
P 1204
P 1205
P 1206
INJECTOR - FI
Injector circuit - cylinder 1
Injector circuit - cylinder 2
Injector circuit - cylinder 3
Injector circuit - cylinder 4
Injector circuit - cylinder 5
Injector circuit - cylinder 6
Injector olc or slc cylinder 1
Injector olc or slc cylinder 2
Injector olc or slc cylinder 3
Injector olc or slc cylinder 4
Injector olc or slc cylinder 5
Injector olc or slc cylinder 6
Remove I Refit
P 1185
PI186
P 1187
P 1188
P 1189
P 1190
X300 EDM
Diagnostic
chart page
no.
35
104
105
104
105
106
108
109
110
111
111
38
112
113
114
115
116
117
118
119
120
121
122
123
N
43
124
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
125
-
45
iii
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
IC NlTlON SYSTEM
Page no.
GROUP 10
P 0300
P 0301
P 0302
P 0303
P 0304
P 0305
P 0306
P 1313
P 1314
P 1315
P 0326
P 0327
P 0328
P 0331
P 0332
P 0333
GROUP 12
P 0335
P 0336
MIL
N
N
N
N
N
N
N
N
N
N
N
MISFIRE
Random misfire detected
Misfire detected -cylinder 1
Misfire detected - cylinder 2
Misfire detected -cylinder 3
Misfire detected -cylinder 4
Misfire detected - cylinder 5
Misfire detected -cylinder 6
Misfire rate, catalyst damage - bank 1
Misfire rate, catalyst damage - bank 2
Persistent misfire
Misfire rate above limit
KNOCK SENSOR 1 - KS 1
KS 1 circuit range / performance
KS 1 circuit low input
KS 1 circuit high input
KNOCK SENSOR 2 - KS 2
KS 2 circuit range / performance
KS 2 circuit low input
KS 2 circuit high input
Remove / Refit
GROUP 13
P 1361
P 1362
P 1363
P 1364
P 1365
P 1366
P 1371
P 1372
P 1373
P 1374
P 1375
P 1376
Issue 2 June 1995
47
126
127
-
-
129
129
131
131
49
Y
Y
Y
133
134
135
Y
133
134
135
Y
Y
52
-
53
CRANKSHAFT POSITION SENSOR CKP
CKP circuit
CKP circuit range / performance
Remove / Refit
CAMSHAFT POSITION SENSOR CMP
CMP circuit
136
137
Y
Y
54
55
-
P 0340
Diagnostic
chart page
no.
138
Y
57
IGNITION COILS
Ignition coil cylinder 1 - no activation
Ignition coil cylinder 2 - no activation
Ignition coil cylinder 3 - no activation
Ignition coil cylinder 4 - no activation
Ignition coil cylinder 5 - no activation
Ignition coil cylinder 6 - no activation
Ignition coil cylinder 1 -early activation
Ignition coil cylinder 2 - early activation
Ignition coil cylinder 3 - early activation
Ignition coil cylinder 4 - early activation
Ignition coil cylinder 5 -early activation
Ignition coil cylinder 6 -early activation
Remove / Refit
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
iv
139
-
140
-
X300 EDM
Fuel, Emission Control
0
A UXlLlARY EMISSION CONTROLS
Page no.
GROUP 14
P 0400
P 1400
P 1401
P 1408
P 1409
GROUP 15
P 041 1
P 0413
P 0414
0
Engine Management
EXHAUST GAS RECIRCULATION- EGR
EGR flow or function sensor olc
EGR valve position control
EGR valve position circuit
EGR function sensor
EGR valve circuit
Sensor and Valve Remove I Refit
MIL
Y
Y
Y
Y
Y
Diagnostic
chart page
no.
60
141
142
143
144
145
65
AUXILIARY AIR INJECTION - AIR
AIR insufficient flow
AIR switching valve olc
AIR switching valve slc
Air Pump Remove I Refit
66
Y
Y
Y
146
147
148
68
69
GROUP16
P 0420
P 0430
CATALYST SYSTEM EFFICIENCY
Catalyst efficiency low - bank 1
Catalyst efficiency low - bank 2
GROUP 17
P 0441
P 0442
P 0443
P 0446
P 0452
P 0453
P 1440
P 1441
P 1447
P 1448
P 1454
EVAPORATIVE EMISSION CONTROL - EVAP
EVAP purge flow
System leak detected
EVAP purge control valve circuit
System vent control
System pressure sensor low input
System pressure sensor
EVAP purge valve open
ELC system 1 fault
ELC closure valve flow
ELC system 2 fault
System vacuum test
Purge Valve Remove I Refit
N
N
149
151
70
Y
Y
Y
Y
Y
153
154
Y
Y
Y
Y
Y
Y
72
VEHICLE SPEED AND IDLE SPEED CONTROL
0
GROUP 18
P 0500
VEHICLE SPEED SENSOR - VSS
GROUP 19
P 0506
P 0507
P 1508
P 1509
IDLE SPEED CONTROL - ISC
Idle control rpm low
Idle control RPM high
ISC o h
ISC SIC
Remove I Refit
GROUP 20
P 1514
P 1516
PI517
X300 EDM
73
vss
Y
155
74
156
157
158
159
77
PARK / NEUTRAL POSITION SWITCH - PNPS
High load neutral I drive
Gear change neutral I drive
Cranking neutral I drive
V
78
Y
Y
Y
161
162
163
Issue 2 June 1995
Y
Y
Y
165
166
167
168
Fuel, Emission Control & Engine Management (AJl6)
PRELIMINARY INFORMATION
The information in this document is designed to assist non-franchised technicians in fault diagnosis and rectification
on 1995MY Jaguar saloon vehicles compliant with OBDll legislation. The document comprises two main sections; Engine Management and Transmission numbered 5.1 and 8. Transmission, Section 8 is divided into two furthersub-sections (8.1 and 8.2) to accommodate the different transmission systems fitted to normally aspirated and supercharged
vehicles.
During fault diagnosis procedures reference is made to the Service Drive Cycle, instruction for performing this action
are detailed below.
Introduction
Most ofthe frequent diagnostic tests involving sensors and actuators will run within approximately20 seconds of starting the engine. The other less frequent diagnostics are timed such that they occur and complete within the Federal
Test Pipe (FTP) drive cycle when conditions are appropriate to providing a correct outcome.
For the purposes of the service technician a more expedient method of generating a trip is described below. This
should ensure that all diagnostic routines are exercised. Any fault information regarding any of the tests will be held
in the GEMS system fault messages received parameters. It must be remembered that the GEMS system operates a
two trip logic convention as allowed by CARB; ie two defined trips are required to switch on the MIL unless the faults
compromise functionality of the whole system, causing the MIL to switch on immediately.
Service Drive Cycle
1.
2.
3.
4.
5.
Allow the car to 'soak' at room temperature until the coolant temperature reaches 60°C.
Start engine.
Idle for approximately8 minutes; diagnostics such as a misfire, sensors and actuators will run and produce an outcome. An additional test requiring the engine to run for 15 minutes is present, thus a long idle period is the most
appropriate method consuming time without excessive miles being clocked.
Accelerate in drive (maximum gear 3rd engine speed 2000 rpm, wide open throttle), up an incline to majntain a
high load for approximately 10 seconds, this will test the Neutral Drive switch and Road Speed diagnostics.
Drive as normal, whilst driving, change through the gears briskly such that 40 gear changes are requested. This
further tests the Neutral Drive Switch.
Note:
Required gear changes must be between gears, not between Neutral and Drive.
6. Accelerate in drive to a target road speed in the range of 35-45mph, then cruise at target speed preferably in a flat
surface to achieve a steady load. Attempt to maintain the speed for a duration of approximately 3 minutes. This
allows adaptations and the Catalyst monitoring routine within the system to take place.
7. Come to idle and park.
8. Rev the engine to 1500 / 2000rpm for a duration of approximately one minute.
9. Wait at idle for a period of 2 minutes.
10. Interrogate Generic Scan Tool and establish faults, if any.
11. Switch off engine.
When performing diagnostics on a vehicle technicians should be aware that erreoneous codes may be introduced by
their actions. In order to ensure correct diagnosis, all codes should be noted, before commencing diagnosis, so that
induced codes can be identified on completion and safely cleared without futher work.
vii
X300 EDM
~
~~
~~~~
Issue 2 June 1995
viii
Fuel, Emission Control & Engine Management (AJI6)
-
0
5.1
FUEL, EMISSION CONTROL AND ENGINE MANAGEMENT
5.1.7
Introduction
5.1.1.1
Diagnostic Codes
All emissions-related diagnostic codes relevant to the 1995MY Jaguar Sedan AJ16 engined vehicles are included in
the Electrical Diagnostic Manual (EDM). The SAE diagnostic codes, which commence with a number '0', e.g. P 0234,
are detailed in numerical order in the contents section. Voluntary codes, which have been added to the system and
commence with a number '1', e.g. P 1234, are included in their related section.
Code numbers are displayed at the top outer corner of the relevant page, starting with P 0101, through to P 1796. The
first page of each section displays all the codes for that section. A description of the location and operation of the component is followed by the individual codes and their fault definition.
5.1.1.2
On-Board Diagnostics I1
OBD I1covers any failure ofthe powertrain system likely to affect exhaust gas quality; this includes fuel, ignition, transmission, anti-lock braking, active suspension, tyre pressure monitoring and active differential failures. The emission
effect threshold is an increase of 1.5 times the base vehicle standard.
The OBD II document contains clauses covering standard communication protocols, fault codes, vehicle terminology
and vehicle interface points.. Whereas the original OBD only monitored failed items, OBD II providesfailure prediction
by observing performance deterioration over a period of time. The four main areas of observation are catalyst, misfire,
exhaust gas recirculation and secondary air system.
0
5.1.1.3
Catalyst Monitoring
Precise control of the fuel and air mixture to the correct stoichiometric level is essential to the proper function of the
three way catalyst, which oxidises Carbon Monoxide (CO) and Hydrocarbons (HC), while reducing Nitrous Oxide
(NOx).
Deterioration of the catalyst conversion efficiency leads to a higher level of emissions. In order to be able to detect
a change in the efficiency ofthe catalyst, the control system must observe both the incoming and the outgoing exhaust
gases. To achieve this aim, exhaust gas oxygen sensors are fitted both upstream and downstream of the catalytic
converter.
5.1.1.4
0
Misfire Monitoring
As engine misfire is the major cause of damaged catalytic converters, control systems must be able to monitor the
quality of each individual firing and so detect engine misfire. The control system must recognise the following three
types of engine misfire:
o A misfire which causes instantaneous catalyst damage.
0 A misfire which will cause a vehicle to fail a Federal Emissions procedure.
0 A misfire which will cause a vehicle to fail an Inspection and Maintenance test.
To create a reference for engine timing, the system needs to accurately detect engine position and speed. This is done
by using a Crankshaft Position Sensor (CKPS).
0
X300 EDM
1
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
5.1.1.5
Exhaust Gas Recirculation (EGR) Monitoring
The production of Nitrous Oxide is limited by the EGR system recirculating exhaust gas through the combustion
chamber. The introduction of exhaust gas contaminates the fuel and air mixture and causes a slower/coolerfuel burn,
reducing Nitrous Oxide emissions.
If the EGR system seizes closed it will cause the uncontrolled production of Nitrous Oxide; if it seizes open it will cause
cooler and cooler combustion resulting in high Hydrocarbon and Carbon Monoxide emissions.
Control systems must detect a failure based upon a fixed Nitrous Oxide emission level. To achieve this control a temperature sensor is fitted in the EGR pipe and levels of emission can be assumed from changes in the temperatures recorded for given EGR valve openings.
5.1.1.6
Secondary Air Injection Monitoring
Secondary air, ie air from the secondary injection system is pumped into the exhaust pipe during the first 30 seconds
of engine running, coinciding with burning , excess fuel, mixture expelled from the engine. This combination allows
the excess fuel to burn, in the exhaust, shortening the raising time of the catalyst operating temperature.
Control systems must indicate when the air flow, from the secondary air injection system, decreases to the extent that
an emissions failure level is reached. The system can gauge the air being delivered by recording the drift in oxygen
sensor switching levels.
Issue 2 June 1995
2
X300 EDM
Fuel, Emission Control & Engine Management (AJI6)
5.7.2
COMPONENT DESCRIPTION
Reference numbers eg (1) are shown in Fig. 1, on the following page.
The engine management system is controlled by the Engine Control Module (ECM) (I),
which receives signals from
the various EMS sensors, compares them to the required standards and then modifies the fuel and ignition settings
to maintain an optimum, stoichiometric, fuel and air mixture under all conditions. Sensor information is supplied to
the ECM as inputs (21, and control commands are issued through the ECM outputs (3).
The Mass Air Flow Sensor (MAFS) (4), measures the quantity of air drawn into the engine and reports to the ECM.
The Intake Air Temperature Sensor (IATS) (5). measures the temperature of the air in the induction tract and reports
to the ECM.
The Idle Speed Control Valve (ISCV)(6), responding to ECM output signals and in conjunction with ignition timing control, governs engine idle speed.
The Engine Coolant Temperature Sensor (ECTS) (71, monitors the engine operating temperature and reports to the
ECM.
The fuel pump (8), situated in the fuel tank, supplies fuel to the fuel rail (9); the fuel pressure regulator (IO), in the fuel
rail, controls the fuel pressure at the fuel injector (FI) (1I),
which injects fuel into the area behind the inlet valve, when
commanded by the ECM.
Thevolumeoffuel injected isgoverned bythe length oftimethe injector isopen;thistime/quantity, required to achieve
the correct mixture, is controlled by the ECM.
Ignition is by spark plugs with attached individual coils (12). Timing of ignition is varied according to speed and load.
The combustion gases, after passing through the exhaust manifold, enterthe catalyticconvertor (13), where the quality
of the exhaust gas emission is modified. The quality of the exhaust gas emission is constantly checked by the Heated
Oxygen Sensors (H02S) (14), which are situated both upstream and downstream of the catalysts. By comparing the
sianal outputs of pre and post catalyst sensorsthe ECM can make corrections to the fuel and ignition settings as necessa4. The sensors contain integral Heaters which accelerate the warming-up of the sensors to enable a rapid correction
of initial settings which may be causing the emission of low quality exhaust gases.
Throttle position is detected by the Throttle Position Sensor (TPS) (15), which reports to the ECM.
The Exhaust Gas Recirculation (EGR) Valve (161, when activated by the ECM, allows exhaust gas to enter the intake air
stream to dilute the oxygen content of the combustible fuel /air mixture, so lowering combustion temperatures and
consequently Nitrous Oxide emissions. The temperature of the introduced gases is monitored by the adjacent EGR
function sensor (17).
If combustion knock is detected by the Knock Sensor (KS) (18), ignition timing, which is normally at optimum advance,
may be retarded on specific cylinders.
Engine speed is measured by the Crankshaft Position Sensor (CKPS)(191, which also monitors differences in crankshaft
acceleration between cylinders, to detect specific cylinder low performance (misfire).
Engine position is measured by the Engine Position Sensor (CMP) (20). This measurement is used by the ECM to determine the commencement of injection.
0
The Secondary Air Injection (AIR) Pump (21), on command from the ECM, via a relay, provides additional airto reduce
the level of Carbon Monoxide (CO) and Hydrocarbons (HC), in the exhaust gases. The additional air accelerates the
rise in exhaust temperature to rapidly reach the catalyst operating temperature level. When the relay energises the
pump in the AIR system it also energizes the solenoid controlling the integral stop valve, opening the air line, through
the mechanical check valve (221, to the exhaust manifold.
Thefueltank(23), hasafuelcapacityof90%ofthetankvolume. Theairvolumeabovethefuel isventedtoatmosphere
through an activated charcoal canister (24), which absorbs the fuel vapour. As fuel is withdrawn from the tank, air is
drawn in through the canister and as the fuel laden air in the tank expands, pressure is relieved through the canister
which retains the suspended fuel.
The canister purge valve (25), responds to an ECM signal and opens the canister line to inlet manifold vacuum; airthen
flows through the activated charcoal canister, carrying vapour into the inlet manifold.
Fuel level is measured by the fuel level sensor (26).
The park/ neutral switch (27), Security and Locking Control Module (SLCM) (28) and ignition on (29), signals are conveyed to the ECM input. Signals are conveyed to the instrument pack (road speed) (30), trip computer (311, diagnostic
MIL lamp (32), Data Link Connector (DLC) (33), and Transmission Control Module (TCM) (Torque Control) (34),from the
ECM.
The inertia switch (35), ensures that electrical power is cut off when the vehicle is subjected to a violent deceleration.
X300 EDM
3
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
0
1
lk32
33
35
____D 34
JlS 23d
1.
2.
3.
4.
5.
6.
7.
8.
9.
IO.
11.
12.
13.
14.
15.
16.
17.
18.
Engine Control Module (ECM)
Engine Control Module Inputs
Engine Control Module Outputs
Mass Air Flow Sensor (MAFS)
Intake Air Temperature Sensor (IATS)
Idle Speed Control Valve (ISCV)
Engine Coolant Temperature Sensor (ECTS)
Fuel Pump
Fuel Rail
Fuel Pressure Regulator
Fuel Injector (FI)
Spark Plugs with Integral Coils
Catalytic Convertor
Heated Oxygen Sensors and Heaters (H02S)
Throttle Position Sensor (TPS)
Exhaust Gas Recirculation (EGR) Valve
EGR Function Sensor
Knock Sensor (KS)
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
Crankshaft Position Sensor (CKP)
Engine Position Sensor (CMP)
Secondary Air Injection System (AIR)
Mechanical Check Valve
Fuel Tank
Activated Charcoal Canister
Canister Purge Valve
Fuel Level Sensor
Park / Neutral Switch
Security and Locking Control Module
Ignition On
Instrument Pack (Road Speed)
Trip Computer
Diagnostic MIL Lamp
Data Link Connector (DLC)
Transmission Control Module (Torque Control)
Inertia Switch
Fig. 1 Engine Management System
Issue 2 June 1995
4
X300 EDM
Fuel, Emission Control & Engine Management
5.1.2.1
Component Location Diagrams
8
I
9
I
14
I
13
2
3
2
13
12
11
-1
1
13 2
5
10
I
6
7 1
I I
10
I
3
I
8. Exhaust Gas Recirculation Valve
9. EGR Function Sensor
IO. Knock Sensor (KS)
11. Crankshaft Position Sensor (CKPS)
12. Engine Position Sensor (CMPS)
13. Secondary Air Injection System (AIR)
14. Fuel Pressure Regulator
1. Idle Speed Control Valve (ISCV)
2. Engine Coolant Temperature Sensor (ECTS)
3. Fuel Injector (FI)
4. Spark Plugs with Integral Coils
5. Catalytic Convertor
6. Oxygen Sensors and Heaters (H02S)
7. Throttle Position Sensor (TPS)
Fig. 1
X300 EDM
5
issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
14
J86 1779
1. Fuel Level Sensor
Carbon Canister
3. On-plug Coils
4. Fuel Injectors
5. Exhaust Gas Recirculation Valve
6. Fuel Pump Regulator
7. Mass Air Flow Sensor
8. Purge Valve
9. Air Pump
IO. Generator
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
2.
Engine Position Sensor
EMS Relay
Crankshaft Position Sensor
Knock Sensor
Heated Oxygen Sensor
Heated Oxygen Sensor
Throttle Position Sensor
Knock Sensor
Engine Control Module
Inertia Switch
Fig. 1 Engine Management Schematic
~~
~
Issue 2 June 1995
6
X300 EDM
Fuel, Emission Control & Engine Management
5.1.2.2
Engine Management Control Module - Pin Details
0
0
J86 1659
High Power Connector A, P1104 (Black)
0
0
1.
2.
3.
4.
5.
6.
7.
8.
9.
IO.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
Power Ground
Injector 1
Idle Speed Control 1
H02S (Post Cat) Heater O/P
Ignition Coil 4
Ignition Coil 3
Air Pump O/P
Ignition Coil 2
Ignition Coil 5
Ignition Coil 1
Ignition Coil 6
Power Ground
Injector 4
Injector 3
Injector 2
Idle Speed Control 4
Fuel Used O/P
ECM Control Relay O/P
Fuel Pump Relay O/P
MIL
Air Conditioning Relay O/P
Engine Speed O/P
Crankshaft Position Sensor I/P
ECM Control Relay Supply
Injector 6
Crankshaft Position Sensor Ground
Injector 5
Idle Speed Control 3
Idle Speed Control 2
H02S (Pre Cat) Heater O/P
Evap. Vent Close Valve O/P
Throttle Position O/P
Engine Torque O/P
Evap. Valve O/P
EGR Valve O/P
Power Ground
Low Power Connector B, P1105 (Red)
1.
2.
3.
4.
5.
6.
7.
8.
9.
IO.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
Fig. 1
Intake Air Temperature I/P
Electrical Load I/P
EGR Valve Function Sensor I/P
Mass Air Flow l/P
-
H02S 3 I/P
Throttle Position Sensor 5V Ground
H02S Signal Ground
Knock Sensor Ground
Diagnostic K Line
Throttle Position Sensor 5V Supply
Throttle Position Wiper
-
Engine Coolant Temperature I/P
EGR Valve Position I/P
H02S 1 I/P
BVC I/P
H02S 2 I/P
H02S 4 I/P
Fuel Tank Level Sensor I/P
Knock Sensor A I/P
-
-
Engine Position Sensor 12V Supply
-
Torque Reduction Request
ParWNeutral Position l/P
Road Speed I/P
Mass Air Flow Sensor Ground
Small Signal Ground
Small Signal Ground
Knock Sensor B I/P
Ignition ’On’ I/P
Engine Position Sensor I/P
Start Inhibit I/P
Air Conditioning ‘On’ I/P
Fuel, Emission Control & Engine Management (AJ16)
5.1.2.3
Transmission Component Location Diagrams
2. Temperature Sensor
3. Speed Sensor
Fig. 1 ZF 4HP 24 E Automatic Transmission
3. Solenoid Operated Valves
4. Pressure Control valve
1. Transmission Harness Connector
2. Internal Harness
Fig. 2 ZF 4HP 24 E Automatic Transmission
Issue 2 June 1995
8
X300 EDM
Fuel, Emission Control & Engine Management
-
5.1.2.4
16
Transmission Control Module (ZF 4HP 2 4 E) - Pin Details
0
/
0
0
-\
Pin Function
Pin Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
Ignition Supply
Vehicle Speed Sensor Positive
Engine Speed
Program Switch Input
Solenoid Valve No.1
Pressure Regulator
Digital Ground
nla
nla
nla
nla
nla
nla
Position Code Y
Diagnostic L Line
System Fault Indicator
nla
nla
Solenoid Valves Supply
Road Speed Screen
Engine Torque Signal
nla
nla
Solenoid Valve MI2
nla
Power Ground
nla
nla
Traction Control Input
nla
nla
Torque Reduction Request
Position code Z
nla
nla
nla
nla
Road Speed Negative
nla
nla
Kick Down Switch
Solenoid Valve No.3
nla
Oil Temperature Sensor Ground
nla
Oil Temperature Sensor Input
Throttle Position Input
nla
Sport Mode Indicator
Position Code X
Diagnostic K Line
nla
nla
nla
nla
Fig. 1
0
X300 EDM
9
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
5.1.3
DIAGNOSTICS
5.1.3.1
Data Link Connector (DLC)
The DLC is located in the passenger compartment between the steering column and the centre line of the vehicle,
mounted at the forward end of the transmission tunnel.
The DLC is rectangular in design and capable of accommodating up to sixteen terminals. The connector has keying
features to allow easy connection in a one handed / blind operation. The vehicle connector and the test equipment
connector have latching features that ensure the test equipment connector will remain mated when properly connected.
16
I I
8
/0
o0
o0
o0
o0
o0
o0
o0
o
I I
\ HI II
i \ I
00000000
wlo
ooooooo'
I'
W- I ,1
I
.
-
J86 1922
Data Link Connector Pin Details
Cavity
1
2*
3
4"
5"
6
7"
8
General Assignment
Ignition Switch Override
(not used)
Discretionary (not used)
Chassis Ground
Signal Ground (SIG RTN)
Discretionary (not used)
K Line of IS0 9141
Discretionary (not used)
Cavity
9
IO"
11
12
13
14
15*
16*
General Assignment
Battery Power - Switched
(not used)
Discretionary (not used)
Discretionary (not used)
Discretionary (not used)
Discretionary (not used)
L Line of I S 0 9141
Battery Power - Unswitched
* Federal Mandated Pins
Fig. 1 Data Link Connector
Issue 2 June 1995
10
X300 EDM
I
Fuel, Emission Control & Engine Management (AJ16)
'
5.1.4
DATA STREAM INFORMATION
5.1.4.1
Parameter Identification (PID) - Access (Mode 07)
Generic OBD I1 PID List
easurernen
X
X
0014
0014
0
X
X
0015
0015
02s11
SFTI 1
Oxygen Sensor 11
Short Term Fuel Trim
02s12
SFTl2
0 2 s 11
Oxygen
Sensor 12
.Short Term Fuel Trim
0018
0018
X
X
02s21
SFT21
0019
0019
X
X
02822
SFT22
~~~~
~
~
~~~~
0 2 s 12
Oxygen Sensor 21
Short Term Fuel Trim
0 2 s 21
Oxygen Sensor 22
Short Term Fuel Trim
Volts
Percent
1 Volts
1 Percent
I
Volts
Percent
1 Volts
I Percent
~
X = Freeze Frame PID (refer to Freeze Frame Access for more information)
Open = Open loop, have not satisfied conditions for closed loop.
Closed = Closed loop using 02%) as feedback for fuel control.
OP DRV = Open loop due to due to driving conditions (heavy acceleration)
OP SYS = Open loop due top vehicle system fault.
CL 02s = Closed loop fuel control, but fault with 0 2 s sensor(s).
X300 EDM
11
Issue 2 June 1995
a
5.1.4.2
Fuel, Emission Control & Engine Management (AJ16)
Freeze Frame Data - Access (Mode 2 )
Freeze Frame Data allows access to emission related data values from specific generic PIDs. These values are stored
the instant an emission related DTC is stored in Continuous Memory. This provides a snapshot of the conditions that
were present when the DTC was stored. Once one set of freeze frame data is stored, this data will remain in memory
even if another emission related DTC is stored, with the exception of Misfire or Fuel System DTCs. Once Freeze frame
data for Misfire or Fuel System DTC is stored, it will overwrite any previous data and freeze frame will not be further
overwritten. When a DTC associated with the freeze frame is erased or a PCM memory reset is performed, new freeze
frame data can be stored again. In the event of multiple emission related DTCs in memory, always note the DTC for
the freeze frame data.
Freeze Frame Data Access List
X
X
X
X
X
0007
0008
0009
oooc
OOOD
5.1.4.3
X
X
LFTI
SFT2
LFT2
RPM
vss
Long Term Fuel Bank 1
Short Term Fuel Bank 2
Long Term Fuel Bank 2
Engine RPM
Vehicle SDeed
Percent
Percent
Percent
R/MIN
MPH/KPH
Generic Scan Tool
Refer to the scan tool manufacturer's instructions to access Freeze Frame Data (Mode 02).
5.1.4.4
Oxygen Sensor Monitoring Test Results - Access (Mode 05)
The Oxygen Sensor Monitoring Test Results allows access to the On-Board sensor fault limits and actual values during
the test cycle. The test cycle has specific operation conditions that must be met (engine temperature, load, etc.) for
completion. This information helps to determine the efficiency of the exhaust catalyst. Listed below are the tests and
test identification numbers that are available.
I
Test ID
I Test Description
I Rich to lean sensor threshold voltage for test cycle
I Lean to rich sensor threshold voltage for test cycle
I Low sensor voltage for switch time calculation
I High sensor voltage for switch time calculation
1 Rich to lean sensor switch time
I
01h
02h
03h
04h
05h
I
I
I
1
-
I Units
1 volts
1 volts
1 volts
I volts
I seconds
The following codes to be confirmed:
06h
09h
35h
36h
80h
Issue 2 June 1995
Lean to rich sensor switch time
Time between sensor transitions
Rich to lean sensor switch time
Lean to rich sensor switch time
Switching time mark-space ratio
seconds
seconds
seconds
seconds
seconds
12
X300 EDM
Fuel, Emission Control
Engine Management (AJ16
MASS AIR FLOW SENSOR - MAFS
Group 1
P 0101
P 0102
P 0103
Monitoring Procedure
The range is checked for values outside the limits.
No signal (open circuit) at any time with the ignition on, or a high signal output below a set engine speed, will be registered as a fault. A low signal test will check for an air meter output consistent with other engine parameters. If these
tests are not passed then a fault event is recorded and if the count exceeds a given limit then a fault is registered.
While fault counting is in progress a back-up value of airflow will be supplied and when faults are present a default
value of airflow, calculated from throttle position, engine speed and inlet airtemperature, will be supplied. The strategy
will report to the Diagnostic Status Manager (DSM) when all the tests have been performed once; the DSM will then
decide whether to store a fault code and illuminate the MIL lamp.
The MAFS (1 Fig. 1) is situated on the left side of the engine compartment, connected to the induction air filter and the
induction manifold elbow (2 Fig. 1). The MAFS electrical connection to the vehicle harness is bythe three pin connector
(3 Fig. 1).
Fig. 1 MAFS Location
~-
X300 EDM
13
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJI6)
Sfrucfure of MAFS
The Lucas 20AM MAFS is of the heated wire type, which measures air flow by the cooling effect of passing air over
a heated platinum wire, altering the electrical resistance of that wire. The electrical resistance value is converted to
an analogue output voltage signal, which is supplied to the Engine Control Module (ECM), for the regulation of the
correct air / fuel ratio.
The heated wire sensor (1 Fig. 1) is situated in the central pillar, which is an integral part of the casing. The pillar has
a central tube entry (2 Fig. 1) and four exit slots (3 Fig. 1) which allow air to pass over the heated wire sensor and return
to the main air flow. The sensor is an integral part of the heatsink and control unit (4 Fig 1) which has the three pin
connector (5Fig. 1) included in the moulding. The metal gauze screen (6 Fig. 1) is designed to stabilize the airflow
through the sensor and also serves to protect the sensor from any debris which may enter the air-stream.
6
2
I
I
1
3
4
5
I
I
118 199
Fin. 1 MAFS Sectional Diagram
Issue 2 June 1995
14
X300 EDM
Fuel, Emission Control & Engine Management (AJI6)
I
0
MAFS / ECM Interface Circuit
12v
MAFS
SOOR
PHOM29
500R
P1118/003
n
1
J91-499
MAFS pin no.
Voltage
Description
00 1
002
003
12v
0-5 V
Ignition dependent voltage supply
Signal - low current
Ground via ECM
ov
Fig. 1 Interface between ECM and MAFS
Additional Information
1.485
1.897
2.293
2.689
3.108
3.525
3.874
4.279
4.700
X300 EDM
0.009
0.017
0.030
0.050
0.080
0.120
0.160
0.215
0.284
15
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
MASS AIR FLOW SENSOR (MAFS) (AJ76 NORMALLYASPIRATED) - RENEW
SRO
18.30.15
Fig. 1 MAFS Location
The Mass Air Flow Sensor (MAFS) is situated on the left-hand side of the engine compartment, connected to the induction air filter and the induction manifold elbow.
Open the hood and fit a wing cover.
Open the trunk and remove the battery cover.
Disconnect the battery ground lead.
Disconnect the MAFS harness multi-plug (3 Fig. 1).
Undo and remove the securing nut of the induction manifold elbow mounting.
Undo and remove the securing nut of the induction air filter mounting.
Slacken the securing clips of the induction manifold elbow hose at the MAFS. Displace and reposition the hose.
Displace and reposition the induction manifold elbow from the mounting bobbin.
Displace and reposition the induction air filter from the mounting bobbin.
Carefully displace and remove the MAFS.
Remove and discard the ’0’ ring seal.
Fitting a new MAFS is the reverse of the removal procedure. Make sure the’O’ ring seal is correctly seated and located
in the locating dowel of the induction air filter.
..
..
..
..
..
.
Issue 2 June 1995
16
X300 EDM
Fuel, Emission Control & Engine Management (AJ16)
0
INTAKE AIR TEMPERATURE - IAT
P 01 12
PO113
Group 2
Monitoring Procedure
The range is checked for values outside the limits.
lfthese tests are not passed then a fault event is recorded and if the count exceeds a given limit then a fault is registered.
While fault counting is in progress a back-up value of air temperature will be supplied and when faults are present a
default value of airtemperature will be supplied. The strategywill report to the Diagnostic Status Manager (DSM)when
all the tests have been performed once; the DSM will then decide whether to store a fault code and illuminate the MIL.
0
I
I l l
/
J18-222
Fig. 1 IAT Sensor Location
The Lucas IOTTIAT Sensor ( (Fig. 2) consists of a negative
temperature coefficient thermistor exposed to inlet air and
enclosed in a ventilated protected housing.
0
Fia. 2
0
X300 EDM
17
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
The following values may be used to check the function of the thermistor:
2.90V at 20°C to 0.57V at 95°C
ECM
- -
5v (clamped)
L
5v
' IP11051001
3k3
ADC
I
+47n
1
1
I
s
I
I
+2n2
PI 106100:
4
I AT
I
Fig. 1 Interface between ECM and IAT
P 07 12
/AT Circuit Low Input
The IAT output is checked for intake values outside expected limits:
0 High temperature threshold 180°C
0 Low temperature threshold 39°C
Possible causes:
0 Temperatures have been very cold (sub -50°C)
0 IAT disconnected
0 IAT harness open circuit or high resistance
0 IAT signal short circuit to battery voltage
0 IAT sensor fault - open circuit or high resistance
o ECM interface circuit fault
/AT Circuit High Input
PO713
A range check o n the output of the air temperature sensor is performed to check for intake values outside expected
limits.
Possible causes:
0 Temperatures have been very hot - engine has boiled
0 IAT harness wires short circuit to ground
0 IAT fault - low resistance
0 ECM interface circuit fault
Issue 2 June 1995
18
X300 EDM
Fuel, Emission Control & Engine Management (AJI6)
INTAKE AIR TEMPERATURE SENSOR - RENEW
SRO
18.30.52
..
.
The AIT sensor is mounted in the induction elbow.
Open the hood and fit a wing cover.
Open the trunk and remove the battery cover.
1 Disconnect the battery ground lead.
1 Disconnect the multi-plug from the AIT sensor.
Undo and remove the AIT sensor and copper washer from
the induction elbow.
1 Refitting a new AIT sensor is the reverse of the removal
procedure.
I
Ill
/
J18-222
Fig. 1 IAT Sensor
X300 EDM
19
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
ENGINE COOLANT TEMPERATURE - ECT
P 0116
PO717
PO118
P 0125
Group 3
Monitoring Procedure
The range is checked for values outside the limits.
A 'time-to-warm-up' test will check that the sensor is responding to the rise in coolant temperature in the running
engine and ensure that closed loop fuelling is entered within a specified time limit. Anothertest will check for abnormal
falls in temperature once the temperature rise has been detected.
If these tests are not passed then a fault event is recorded and if the count exceeds a given limit then a fault is registered.
While fault counting is in progress a back-up value of coolant temperature will be supplied and when faults are present
a default value of coolant temperature will be supplied. Coolant temperature default value will depend on intake air
temperature value. The strategy will report to the Diagnostic Status Manager when all the tests have been performed
once; the DSM will then decide whether to store a fault code and illuminate the MIL Lamp.
Fin. 1 Location of ECT sensor
issue 2 June 1995
20
X300 EDM
Fuel, Emission Control & Engine Management (AJl6)
The Lucas 8TT Engine Coolant Temperature Sensor (ECTS) is a negative temperature coefficient thermistor enclosed
in a protective housing. The ECTS is situated in the thermostat housing and supplies the ECM with engine coolant
temperature information.
Fig. 1 ECTS
0 '
ECM
?'"
PI107/001
r'
4
EC T
0
Fig. 2 Interface between ECM and ECTS
0
X300 EDM
21
issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
ECT Circuit Range / Performance - Falling Temperature
PO116
A falling temperature test will check for abnormal falls in temperature once a temperature rise has been detected.
e
Possible causes:
o Thermostat seized open
0 ECT connector high resistance when hot
0 Intermittent high resistance - ECT harness
0 ECT - changing output
PO177
ECT Circuit Low Input
The output of the ECT sensor is checked for values outside limits:
0 High temperature limit 180°C
0 Low temperature limit -39°C
Possible causes:
o Temperatures under -50°C
0 ECT disconnected
0 ECT harness open circuit or high resistance
o ECT signal short circuit to battery voltage
0 ECT fault - open circuit or high resistance
0 ECM interface circuit fault
0
PO118
ECT Circuit High Input
The output of the ECT sensor is checked for values outside limits.
Possible causes:
0 Temperatures very hot - engine boiled
0 ECT harness wires short circuit to ground
0 ECT fault - low resistance
0 ECM interface circuit fault
P 0725
Excessive Time to Enter Closed Loop Fuel Control
A test will check that the sensor responds in 5 seconds to a rise in coolant temperature to 20°C
Possible causes:
0 Low ambient temperature
0 Thermostat seized open
0 ECT harness - high resistance
0 ECT high resistance
0 ECM interface circuit
Issue 2 June 1995
0
22
X300 EDM
Fuel, Emission Control & Engine Management (AJ16)
Additional Information
The following information is also relevant to the IAT sensor. Figure 1 shows a graph of coolant
resistance with respect to temperature.
5
4
2
c
E
-$
104
8
6
4
0
C
2
0
+
v)
*p
K
z&
w=
103
8
6
4
2
102
8 I
-30-20
I
I
I
I
I
0
20
40
60
80
I
100 120130
Temperature "C
J91-470
Fig. 1 Sensor resistance with respect to temperature
The voltage level for any temperature may be calculated by taking the following readings and substituting them into
the formula. Figure 2 shows the test points.
VT
ov
ORT
J 91-469
Formula:
VT=
RT
x5v
( 1k8 + R f )
Fig. 2 Test points
X300 EDM
23
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
C O O L A N T TEMPERATURE SENSOR - RENEW
SRO
18.30.10
The coolant temperature sensor is mounted in the thermostat housing.
WARNING: ALLOW THE ENGINE TO COOL BEFORE WORKING ON THE COOLING SYSTEM.
Open the hood and fit a wing cover.
Open the trunk and remove the battery cover.
Disconnect the battery ground lead.
Carefully release the coolant pressure at the header tank.
Re-tighten the header tank cap.
Disconnect the coolant temperature sensor multi-plug.
Undo and remove the coolant temDerature sensor from
the thermostat housing.
Refitting a new coolant temperature sensor is the reverse
of the removal procedure.
.
Fig. 1 Coolant Temperature Sensor
Issue 2 June 1995
24
X300 EDM
X300 EDM
25
Issue 2 June 1995
0
I
I
Fig. 1 TP Sensor
a
ECM
1
5v (clamped)
r
P1118/002
12k
I
ADC
P
P1118/001
PI1WO03
0
TP
J
J91-502
Fig. 2 TP Circuit
Issue 2 June 1995
26
X300 EDM
Fuel, Emission Control & Engine Management (AJl6)
0
TP Circuit Range / Performance
P 0121
Possible causes:
0 Engine unable to breathe properly - blocked inlet or exhaust system
0 TP harness / connector partial short circuit or open circuit - undetected by range checks
0 ECM stepper position is wrong but undetected
0 TPfaulty
0 MAFS signal is wrong but undetected
0 IAT sensor is wrong but undetected
0 Extreme altitude barometric conditions and limit components have been encountered
0 ECM engine speed value is wrong
P 0122
TP Position Circuit low Input
A range check on the output of the throttle position sensor is performed to check for input values outside expected
limits.
0 High voltage threshold: 4.0V
0 Low voltage threshold: 0.15V
0
High voltage test not performed at engine loads greater than 0.36 g/s.
High voltage test counter not incremented until all conditions for test failure have been present for longer than 5 seconds.
Possible causes:
o Partial short circuit to ground or open circuit in TP signal wire / connectors
o TP supply low - wiring / connectors high resistance
0 TP faulty low out of range
0 ECM fault in Analogue to Digital Conversion (ADC) and interface circuit - gives low volts
P 0123
TP Circuit High Input
A range check on the output of the throttle position sensor is performed to check for input values outside expected
limits.
0 High voltage threshold: 4.0V
0 Low voltage threshold: 0.15V
High voltage test not performed at engine loads greater than 0.36 g/s
High voltage test counter not incremented until all conditions for test failure have been present for greater than 5 seconds.
0
Possible causes:
0 TP ground harness / connectors open circuit
o TP faulty high out of range
o ECM load signal is wrong (too low) but undetected
o ECM fault in Analogue to Digital Conversion (ADC) and interface circuit gives high volts
0
X300 EDM
27
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
THROTTLE POSITION SENSOR - RENEW
SRO
18.30.17
Refer to Fig. 1.
1 Open the hood and fit a wing cover.
1 Open the trunk and remove the battery cover.
1 Disconnect the battery ground lead.
1 Disconnect the throttle position sensor multi-plug.
1 Undo and remove the throttle position sensor to throttle
housing securing screws.
m: Remove the securing screw towards the front of the
vehicle first.
1
1
1
Displace and remove the throttle position sensor retaining
plate.
Remove the throttle position sensor.
Clean the throttle housing mating face.
Fit and fully seat the new throttle sensor to the throttle
housing, making sure it engages correctly on the spindle.
Fit and align the retaining plate.
Fit the securing screw towards the rear of the vehicle. Do
not fully tighten at this stage.
Fit and tighten the securing screw towards the front of the
vehicle.
Fully tighten the rear securing screw.
Note:
1
1
1
1
Fig. 1
Make sure the throttle position sensor remains correctly engaged during fitting.
Reconnect the harness multi-plug.
Reconnect the battery ground lead.
Refit the battery cover.
Carry out engine setting procedure using Jaguar Diagnostic equipment.
Issue 2 June 1995
28
X300 EDM
Fuel, Emission Control & Engine Management (AJ16)
HEATED OXYGEN SENSOR - H02S
P 0131 / P 0132
P 0133
P 1137/P0137
P 1138/P0138
P 0139/ P 0151
P0153/P0152
P 1157/ P 0157
P 1158/P0158
P 0159
Group 5
Monitoring Procedure
The oxygen sensors are first tested when a fuel system fault is suspected; the results of further periodic tests on the
response rate of the sensors are compared to standards.
If a sensor is faulty, then the default will be to switch to using fuel feedback control on the diagnostic sensor for that
bank, and if that sensor is not working correctly then the next default action will be to switch to open loop fuelling.
If the test response rate is lower than the standard then the test will fail; the output will also be monitored to determine
maximum and minimum signal voltages and if these are not within the limits then the test will fail. If these tests are
not passed then a fault event is recorded and if the count exceeds a given limit then a fault is registered.
The strategy will report to the Diagnostic Status Manager (DSM)when all the tests have been performed once; the DSM
will then decide whether to store a fault code and illuminate the MIL Lamp.
The Heated Oxygen Sensors (H02S)are situated upstream and downstream the catalysts in the exhaust system and
are identified asfollows:
Bank 1 - Cylinders 1 to 3 -forward exhaust system
Bank 2 - Cylinders 4 to 6 - rearward exhaust system
Sensor 1 - Sensor upstream of the catalyst - close to the cylinder head
Sensor 2 -Sensor downstream of the catalyst - away from the cylinder head
Fig. 1 Upstream sensors
A - Bank 1 Sensor 1
B - Bank 2 Sensor 1
X300 EDM
Fig. 2 Downstream Sensors
C - Bank 1 Sensor 2
D - Bank 2 Sensor 2
29
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
m: H02S sensors and harness connectors are not identified as to position, so when sensors, harness or exhaust
arechanged they must be labelled to enable correct reconnection and location. Failure to observe this precaution may require the use of a Jaguar Diagnostic equipment to reprogramme the ECM.
0
The NTKTO 19 H02S is used in the three way catalytic converter system to accurately monitor exhaust gas for correct
air / fuel mixture.
The sensors are of the Titanium Dioxide (Ti02) type, which have a tip, composed of an alumina substrate with a thick
film titanium dioxide element. The Ti02 sensor does not require reference air to detect the oxygen content of the exhaust, so flooding or contamination of the sensor exterior will not affect sensor performance. The resistance of the
sensor element varies greatly with the partial pressure of oxygen in the exhaust gas. This change in resistance is converted to a change in voltage output to the ECM via a constant voltage source and reference resistance. Whenever the
air / fuel ratio passes lambda-I (stoichiometric mixture), the sensor delivers a voltage swing, indicating whether the
mixture is richer or leaner than lambda-I.
The sensor resistance also varies with temperature and so a heater is used to maintain a constant tip temperature of
approximately 800°C. It takes approximately 20 seconds from engine start for the sensors to reach an active temperature of approximately 500°C.
Catalyst equipped vehicles must use unleaded fuel; the use of one tank of leaded fuel will have a damaging effect on
catalyst and sensor efficiency. The importance of using unleaded fuel is emphasised by labels fitted to the filler neck
panel and the fuel gauge area of the fascia. The fuel filler neck is designed to accommodate only unleaded fuel pump
m: With the exception of France and Germany, labels denoting unleaded fuel are not fitted to UK and European
0
vehicles.
1
2
8
J19.455
1.
2.
3.
4.
4
3
7
5
6
5.
6.
7.
8.
Lead Wire
Silicon Rubber Plug
Glass Seal
Gasket
e
Ti02Tip
Cover
Shell
Lead Wire
Fig. 1 H02S Section
e
Issue 2 June 1995
30
X300 EDM
Fuel, Emission Control
Engine Management
ECM
H02S Sensor
r
-
J 91 503
Fia. 1 H02S Circuit - H02S No. 1 Onlv
Lean
CAT Volts
Area
Rich
CAT Volts
Upstream
’
Downstream
J91-467
.
/
Fig. 2 H02S Characteristic
X300 EDM
31
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
H02S Circuit Low
H02S Circuit Low
H02S Circuit Low
HO2S Circuit Low
Voltage - Bank 1 Sensor 1
Voltage - Bank 1 Sensor 2
Voltage - Bank 2 Sensor 1
Voltage - Bank 2 Sensor 2
P 0131
P 0137
P 0151
P 0157
e
The output voltage of the H02S is monitored for values which are lower than the expected range.
The H02S low voltage threshold is 14.65 mV.
Possible causes of fault:
0 H02S signal wire short circuit to ground.
o H02S fault.
0 H02S sensor tip too hot - heater error, or loss of full load enrichment.
0 ECM interface circuit fault.
H02S Circuit High
HO2S Circuit High
HO2S Circuit High
H02S Circuit High
Voltage - Bank 1 Sensor 1
Voltage - Bank 1 Sensor 2
Voltage - Bank 2 Sensor 1
Voltage - Bank 2 Sensor 2
P 0132
P 0138
P 0152
P 0158
The output voltage of the sensor is monitored for values which are higher than the expected range.
The 0 2 sensor high voltage threshold is 4.989 V
a
Possible causes of fault:
0 H02S disconnected
0 H02S ground or signal wire open circuit or short circuit to battery voltage
0 H02S tip too cold - heater error
0 H02Sfault
0 ECM - interface circuit fault
H02S Circuit - Slow Response - Bank 1 Sensor 1
H02S Circuit - Slow Response - Bank 1 Sensor 2
H02S Circuit - Slow Response - Bank 2 Sensor 1
HO2S Circuit - Slow Response - Bank 2 Sensor 2
P 0133
P 0139
P 0153
P 0159
Periodic tests on the response rates of the sensors will be compared against reference rates, if the response is lower
than the reference, then the test will fail.
Possible causes of fault:
0 H02S harness fault
0 H02S contaminated
o H02Sfault
Issue 2 June 1995
*
32
X300 EDM
Fue Emission Control & Engine Management (AJ16)
Lack of H 0 2 S Switch Indicates Lean - Bank 1 Sensor 2
Lack of H 0 2 S Switch Indicates Lean - Bank 2 Sensor 2
P 1137
P 1157
The sensor output is monitored to determine the system control setting; if this is not within the required limits then
the test will fail.
Tests are performed on the sensors to check for sensor output signals at eitherthe upper or lower limit values; if a signal, at a limit, is detected then fuelling changes will be introduced to move the signal off the limit. If this is successful
then a fuelling fault is suspected.
Possible causes of fault:
0 Exhaust air leak
0 H02S loose - not fitted correctly
0 H02S wiring fault - sensor open circuit
0 H02S heater problem - tip temperature too cold
0 H02S wires crossed
0 H02S failure - remains lean - high resistance
0 ECM fault - H02S input circuit fixed - indicating lean
Lack of H 0 2 S Switch Indicates Rich - Bank 1 Sensor 2
Lack of H 0 2 S Switch Indicates Rich - Bank 2 Sensor 2
I
P 1138
P 1758
The sensor output is monitored to determine the system control setting; if this is not within the required limits then
the test will fail.
Tests are performed on the sensors to check for sensor output signals at either the upper or lower limit values; if a signal, at a limit, is detected then fuelling changes will be introduced to move the signal off the limit. If this is successful
then a fuelling fault is suspected.
Possible causes of fault:
0 H02S wiring fault -sensor short circuit to ground
o H02S heater problem - t i p temperature too hot
0 H02S wires crossed
0 H02S failure - remains rich - low resistance
0 ECM fault - H02S input circuit fixed - indicating rich
X300 EDM
33
Issue 2 June 1995
I
HEATED OXYGEN SENSOR (HOZS), DOWNSTREAM - RENEW
SRO
78.30.66
The downstream heated oxygen sensors (H02S) are situated after the catalytic converters (Fig. 1). The sensor, harness
and connector must be renewed as a whole.
Note:
..
.m:
H02S and harness connectors are not identified as to position. When renewing sensors, label the harness connectors to ensure correct reconnection.
Open the hood and fit a wing cover.
Open the trunk and remove the battery cover.
Disconnect the battery ground lead.
.
..
The downstream H02S harness connectors are
bracket mounted on the left-hand side of the engine
above the bell housing.
Remove the bolt securing the H02S harness connector
bracket to the inlet manifold.
Identify the downstream H02S harness connector.
Release the tang securing the H02S harness connector to
the bracket and disconnect.
Cut and remove the ratchet strap securing the harness
below the mounting bracket.
Release the appropriate harness from the harness clips
around the engine / bell housing joint.
Fig. 1
J18 291
Remove the bolt securing the harness ‘P‘ clip at the right
hand side of the bell housing.
Raise the vehicle.
Displace and remove the harness ‘P‘clip from the H02S
harness.
Remove the sensor from the catalytic converter.
Fit and fully seat a new sealing washer to a new H02S.
Fit and tighten the H02S to the catalytic converter.
Insert the H02S harness into the ’P’ clip. Fit and tighten the ‘ P clip to bell housing securing bolt.
Lower the vehicle.
Route the harness across the bell housing joint to the left-hand side of the engine, inserting the harness into the clips.
Reconnect the H02S connector and fully seat in the mounting bracket.
Secure the H02S harnesses together beneath the mounting bracket with ratchet straps.
Align the connector mounting bracket to the inlet manifold and fit and tighten the securing bolt.
Reconnect battery ground lead.
Refit battery cover and close trunk.
Remove wing cover and close hood.
.
.
..
..
..
..
..
...
Issue 2 June 1995
34
X300 EDM
System Too Rich
System Too Rich
- Bank 1 - Excess Flow
- Bank 2 - Excess Flow
P 0172
P 0175
Possible causes:
0 Exhaust leak on A, B
0 Misfire on that bank
o Oxygen sensor wiring problem - partial short circuit to ground, sensor A, B
0
o
o
Leaky injector on that bank
Oxygen sensor high Mark Space Ratio (MSR) - Sensor fault, rich shift on A, B
ECM fault - interface or Analogue to Digital Convertor (ADC) problem with sensor input A, B
Rich Fuelling - Banks 1 and 2
P 1172
Possible causes:
0 Pressure regulator fault - high fuel rail pressure
o Blocked fuel pipe in return to tank
0 Vacuum pipe ruptured between manifold and pressure regulator
0 Leaking injectors on both banks
0 Air flow meter high output
0 Both oxygen sensors (A and B) fail to switch lean
o ECM fault - reads Battery Voltage Correction (BVC) wrongly (lower than actual)
lean Fuelling Trim, Long Term (FMFR)
P 1176
These tests monitor the performance of the adaptive fuelling system. There are limits on both fuel mass flow rate
(FMFR) and air mass flow rate (AMFR). If the corrections it applies exceed these limits then the appropriate fault is
present until the system returns within limits.
Possible causes:
o Fuel pump relay fault - not driving pump
o Low voltage supply to fuel pump
0 Fuel pump failure - low pressure out of pump
0 Blocked fuel pipe or fuel filter
0 Fuel filter very dirty
0 Pressure regulator fault - low fuel rail pressure
0 Blocked injectors on both banks - dirty fuel
o Wiring fault on injector supply - partial short circuit to Ground
0 Air flow meter low output
0 Fuel pipe! rail leaks
0 ECM fault - reads Battery Voltage Correction (BVC) wrongly (higher than actual)
Issue 2 June 1995
36
X300 EDM
Fuel, Emission Control & Engine Management (AJ16)
0
Rich Fuelling Trim, Long Term (FMFR)
P 1177
These tests monitor the performance of the adaptive fuelling system. There are limits on both fuel mass flow rate
(FMFR) and air mass flow rate (AMFR). If the corrections it applies exceed these limits then the appropriate fault is
present until the system returns within limits.
Possible causes:
0 Blocked fuel pipe in return to tank
0 Pressure regulator fault - high fuel rail pressure
0 Vacuum pipe ruptured between manifold and pressure regulator
0 Leaking injectors on both banks
o Air flow meter high output
0 Injector problem - high flow or leaky injectors
0 One or both oxygen sensor get a rich bias - sensor fault
0 ECM fault - reads Battery Voltage Correction (BVC) wrongly (lower than actual)
Lean Fuelling Trim, Long Term (AMFR)
a
0
0
P 1178
Fuel, Emission Control & Engine Management (AJ16)
HEATED OXYGEN SENSOR - H02S (HEATER)
P
P
P
P
P
P
Group 7
1185/P
1187/P
1189/P
1191 / P
1193/P
l195/P
1186
1188
1190
1192
1194
1196
Monitoring Procedure
The heaters are connected to the ECM in pairs and hardware detection will provide indication of both heaters in a pair
open circuit or, one or both heaters short circuit. The heater current and average output tests use the closed loop tip
temperature control system to indicate faults and, if this system is unable to control tip temperature satisfactorily, then
a number of faults can be detected.
If a fault is registered, the system will default to operating the heaters whenever the fuel pump is on, except when engine speed and load are above limits.
The strategy will report to the Diagnostic Status Manager (DSM) when an oxygen sensor heater fault is present and
the DSM will then decide whether to store a fault code and illuminate the MIL IamD.
The Heated Oxygen Sensors (H02S) are situated before and after the catalysts in the exhaust system and are identified
as follows:
Bank 1 - Cvlinders 1 to 3 - forward exhaust svstem
Bank 2 - Cylinders 4 to 6 - rearward exhaust system
Sensor 1 -Sensor upstream of the catalyst - close to the cylinder head
Sensor 2 - Sensor downstream of the catalyst - away from the cylinder head
Fig. 2 Downstream Sensors
C - Bank 1 Sensor 2
D - Bank 2 Sensor 2
Fig. 1 Upstream sensors
A - Bank 1 Sensor 1
B - Bank 2 Sensor 1
-!&e:
H02S sensors and harness connectors are not identified as to position, so when sensors, harness or exhaust
arechanged they must be labelled to enablecorrect reconnection and location. Failure to observe this precaution may require the use of a Jaguar Diagnostic equipment to re-programme the ECM.
Issue 2 June 1995
3%
X300 EDM
Fuel, Emission Control & Engine Management
1
2
1.
2.
3.
4.
5
7
8
J19.455
4
3
6
5.
6.
7.
8.
Lead Wire
Silicon Rubber Plug
Glass Seal
Gasket
Ti02Tip
Cover
Shell
Lead Wire
Fig. 1 H02S Section
PI1261003
PI1261004
K
1
Sensor
-
L(
d
1
-
J91-504
Fig. 2 H02S Circuit
The H02S resistance varies with temperature and so a heater is used to maintain a constant tiptemperature of approximately 700°C. At this temperature the sensor output will be 3.3V for lean running and 1.1V for rich running.
X300 EDM
39
Issue 2 June 1995
HOZS Sensor Heater Open Circuit - Banks 1 and 2 Sensor 7
HOZS Sensor Heater Open Circuit - Banks 1 and 2 Sensor 2
P 1191
Possible causes:
0 Heater wiring open circuit
0 ECM to heater connector open circuit
0 ECM to heater wiring is short circuit to ground
o Both heaters open circuit supply - harness or connector faults
0 Both heaters open circuit - sensor
0 ECM hardware monitor fault implying open circuit heaters
H02S Sensor Heater Short Circuit - Banks 1 and 2 Sensor 1
HOZS Sensor Heater Short Circuit - Banks 1 and 2 Sensor 2
P 1186
P 1192
The heaters are connected to the ECM; hardware detection will provide indication of both heaters open circuit and one
or both heaters short circuit.
Possible causes:
o ECM to heater wiring is short circuit to voltage source
0 Both heaters short circuit -sensor
0 ECM hardware monitor fault implying short circuit heaters
H02S Sensor Heater Open Circuit - Inferred - Banks 7 and 2 Sensor 7
H02S Sensor Heater Open Circuit - Inferred - Banks 1 and 2 Sensor 2
P 1187
P 1193
The heaters are connected to the ECM in pairs; hardware detection will provide indication of both heaters open circuit
and one or both heaters short circuit.
Possible causes:
0 Heater harness high resistance or open circuit
0 Excessive ignition retard causing hot exhaust gases
0 Both heaters high resistance
0 Incorrect test timing - air flow meter problem
0 Incorrect heater calibration - ECM programming
0 ECM fault - heater control system
Issue 2 June 1995
40
X300 EDM
0
Fuel, Emission Control & Engine Management (AJ16)
0
H 0 2 S Sensor Heater - Resistance - Banks 1 and 2 Sensor 1
H 0 2 S Sensor Heater - Resistance - Banks 7 and 2 Sensor 2
The heater current and average output tests use the closed loop tip temperature control system
the closed loop system is unable to control tip temperature then faults will be detected.
P 1188
P 1194
indicate faults. If
Possible causes:
0 ECM to heater wiring is open circuit
0 ECM to heater wiring is part open circuit
0 ECM to heater wiring is short circuit to ground
0 Battery voltage low and battery voltage sensing
0 Both heaters are high resistance or open circuit - sensor
0 ECM heater current monitor reads low
0 Incorrect heater calibration
0 ECM current sense resistor
H 0 2 S Sensor Heater Circuit Low Resistance - 1 - Banks 7 and 2 Sensor 1
H 0 2 S Sensor Heater Circuit Low Resistance - 1 - Banks 1 and 2 Sensor 2
The heater current and average output tests use the closed loop tip temperature control system
the closed loop system is unable to control tip temperature then faults will be detected.
P 1189
P 1195
indicate faults. If
Possible causes:
0 H02S out of exhaust
0 Heater harness short circuit
0 Low battery voltage
0 Incorrect test timing - air flow meter problem
0 H02S heater low resistance
0 Incorrect heater calibration - ECM programming
H 0 2 S Sensor Heater Circuit Low Resistance - 2 - Banks 1 and 2 Sensor 1
H 0 2 S Sensor Heater Circuit low Resistance - 2 - Banks 1 and 2 Sensor 2
The heater current and average output tests use the closed loop tip temperature control system
the closed loop system is unable to control tip temperature then faults will be detected.
P 1190
P 1196
indicate faults. If
Possible causes:
0 ECM to heater wiring short circuit to a voltage source
0 Excess heater current - battery voltage > 17V
0 Both heaters low resistance or short circuit
0 ECM heater current monitor reads high - ECM fault
o Incorrect heater calibration - ECM programming
0 ECM current sense resistor
X300 EDM
41
Issue 2 J une 1995
Fuel, Emission Control & Engine Management (AJ16)
Additional Information
Fig. 1 shows a graph of sensor resistance with respect to the tip temperature; GEMS controls the temperature of the
tip to 700°C.
100M
\ \
I
10M
z
Sensor to Sensor
Resistance Variability
1M
0
cc
8
$ 100k
c,
v)
.
I
v)
10k
E
\
\
\\
Ik
I
Rich( X =0.9)
100
400
500
600
700
800
900
Tip Temperature ("C)
J91-C71
Fig. 1 Sensor Resistance with Respect to Temperature
The voltage level for any temperature may be calculated by taking the following readings and substituting them into
the formula. Fig. 2 shows the test points.
VT
IOU
Formula:
VT=
RT
x5v
(51K + RT)
4
RT
J91-468
Example: At 700°C Lean RT = 100k VT = 3.3V
Rich RT = 15K VT = 1.1V
Issue 2 June 1995
Fig.
42
X300 EDM
Fuel, Emission Control & Engine Management
-
INJECTORS
P
P
P
P
P
P
Group 9
Monitoring Procedure
Two double sampled tests are used to check injector operation.
The first test operates while the engine is running, the second operates during stall or power-down. When sufficient
events have occurred to register a fault with the engine running a hardware fault is present. When sufficient events
have occurred to register a fault with the engine stalled or
during power-down, an injector ground short or open circuit
fault is present. There is no injector default strategy.
The strategy will report to the Diagnostic Status Manager
(DSM) when an injector fault is present and the DSM will
then decide whether to store a fault code and illuminate the
MIL Lamp.
Fig. 1 Injector Location
X300 EDM
43
issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
Problems with the injectors may be detected usingtwo tests;
the first cannot distinguish between open circuit and short
to battery or ground faults, the second isolates the short to
battery condition.
0
Current Profile:
Resistance - 15.9 f 0.35Q. at 20°C.
At idle, pulse width is approximately 2.4ms.
Injector
Pulse Width
Voltage Profile:
J91-466
Fig. 1
Injector Ciri tit - Cylinder 1
Injector Circuit - Cylinder 2
Injector Circuit - Cylinder 3
Injector Circuit - Cylinder 4
Injector Circuit - Cylinder 5
Injector Circuit - Cylinder 6
P 0207
P 0202
P 0203
P 0204
P 0205
P 0206
Possible causes:
0 Injector harness problem
0 Injector coil fault
0 ECM fault - injector drive circuit problem
Injector Circuit Open Circuit or Short Circuit ;
P
P
P
P
P
P
Cylinder 1
Cylinder 2
Cylinder 3
Cylinder 4
Cylinder 5
Cylinder 6
1201
1202
1203
1204
1205
1206
Possible causes:
0 Injector harness problem - injector N
0 Injector coil fault - injector N
0 ECM fault - injector drive circuit problem
Issue 2 June 1995
44
X300 EDM
0
Fuel, Emission Control & Engine Management (AJ16)
FUEL RAIL /PRESSURE REGULATOR VALVE/ INJECTORS (NORMALLY ASPIRATED ENGINE), RENEW
SRO
19.60.13
SRO
79.45.11
SRO
18.10.01 INJECTORS
SRO
18.10.02 INJECTORS (VEHICLE SET)
WARNING: WORKING ON THE FUEL SYSTEM MAY RESULT IN FUEL AND FUEL VAPOUR BEING PRESENT IN THE
ATMOSPHERE. FUEL VAPOUR IS EXTREMELY FLAMMABLE, HENCE GREAT CARE MUST BE TAKEN
WHILST WORKING ON THE FUEL SYSTEM. ADHERE STRICTLY TO THE FOLLOWING PRECAUTIONS:
DO NOT SMOKE IN THE WORK AREA.
DISPLAY ‘NO SMOKING’ SIGNS AROUND THE AREA.
ENSURE THAT A CO2 FIRE EXTINGUISHER IS CLOSE AT HAND.
ENSURE THAT DRY SAND IS AVAILABLE TO SOAK UP ANY FUEL SPILLAGE.
EMPTY FUEL USING SUITABLE FIRE PROOF EQUIPMENT INTO AN AUTHORIZED EXPLOSION-PROOF
CONTAINER.
DO NOT EMPTY FUEL INTO A PIT.
ENSURE THAT WORKING AREA IS WELL VENTILATED.
ENSURE THAT ANY WORK ON THE FUEL SYSTEM IS ONLY CARRIED OUT BY EXPERIENCED AND WELL
QUALIFIED MAINTENANCE PERSONNEL.
Fig. 1
Fig. 2
X300 EDM
45
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
.
..
..
..
..
.
..
0
Remove
9
Reposition top edge of trunk front liner for access.
Disconnect multi-plug from evaporative loss flange.
Switch ignition on.
Crank engine to depressurize fuel system.
Switch ignition off.
Disconnect battery, see Section 15.
Disconnect ground lead eyelet from inlet manifold stud.
Disconnect engine harness to oxygen sensor leads multi-plug.
Disconnect engine harness to starter motor solenoid link lead multi-plug.
Undo fuel injector multi-plug cover fixings (1 Fig.1, previous page).
Disconnect cover(2 Fig.1, previous page) from injectors.
Undo fuel rail to feed pipe union nut (2 Fig.2, previous page).
Reposition fuel feed pipe from fuel rail union and fit blanking plugs to rail and pipe.
Undo and remove regulator mounting bracket to inlet manifold bracket securing bolts.
Undo fuel rail to regulator union nut.
Reposition regulator from fuel rail union and fit blanking plugs.
.
/
/
8 /
119 L66
Fig. 1
..
..
..
..
..
Undo and remove fuel rail securing bolts.
Remove fuel rail assembly (1 Fig.1) from manifold.
Fit blanking plugs to manifold.
Drain the residual fuel from the fuel rail into a suitable drain tin.
Remove the injector retaining clips (2 Fig.1).
Remove injectors (3 Fig.1).
Disconnect vacuum hose from regulator.
Remove regulator mounting bracket.
Undo fuel rail to regulator union nut.
Remove regulator assembly.
Refit in the reverse order of the removal procedure.
issue 2 June 1995
46
X300 EDM
P 1313
P 1314
Fuel, Emission Control & Engine Management (AJ16)
Persistent Misfire
Possible cause:
0 One cylinder identified and injector turned off
p1315
Misfire Rate Above Limit
P 1316
Possible causes:
o Harness faults - injectors or coils - partial open circuit or short circuit
o Spark plug problems
0 Low fuel pressure
0 Fuel contaminated
0 ECM fault - ignition coil drive or injector drives
Issue 2 June 1995
48
X300 EDM
0
K N O C K SENSOR - KS
Group 11
Monitoring Procedure
Knock sensing faults are detected by using two tests. If the knock controller cannot adjust the background noise average to within limits then a knock sensor fault event is recorded and when the fault event counter reaches its limit, a
low or high background noise knock fault is registered. If knock correction is at the maximum value for a set number
of cycles then a continuous knock fault is registered.
The strategy will report to the Diagnostic Status Manager (DSM) when a knock sensing fault is present and the DSM
will then decide whether to store a fault code and illuminate the MIL Lamp.
Fig. 1 Location of knock sensors
The knock sensor uses a piezo-electric sensing element to detect broad band (2-20 khz) engine accelerations. When
the closed loop knock controller is unable to adjust the background noise average to within a defined band either side
of the reference background noise average then a fault has occurred, and a relevant fault counter incremented.
X300 EDM
49
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
ECM
560fJk
I
1
PH051009
I
U
PI1owoo1
U
I
Fig. 1 Interface between ECM & knock sensor
KS 1 Circuit Range / Performance A, B
KS 2 Circuit Range / Performance A, B
P 0326
P 0331
When continuous knock detection on one or more cylinders has caused knock correction to reach it’s maximum value
and stay there for a predetermined number of cycles, then there is a knock sensor circuit range / performance fault.
Possible causes:
o Cylinder head overheats - loss of coolant
0 Wrong fuel type used - low octane
0 Cylinder deposits (on bank A,B)
o Quiet engine with background noise spikes causing retard A,B
o Radio Frequency Interference (RFI) affects knock signal -shielding problem with harness A,B
o ECM fault - knock ASK fails
P 0327
P 0332
KS 1 Circuit Low Input A, B
KS 2 Circuit Low Input A, B
When the closed loop knock controller is unable to adjustthe background noise average to within a defined band either
side of the reference background noise, then a knock sensor fault event has occurred. If the knock fault event counter
reaches a given threshold, then a low or high background noise knock fault is present.
Possible causes:
o Knock sensor A,B not in good acoustic contact with block e.g. loose
o Knock sensor wiring open circuit or short circuit to ground
o Background anomalously quiet for a cylinder on that bank
o Knock sensor signal attenuated - harness problem
0 Knock sensor fault A,B, lost sensitivity
o ECM fault - knock ASK failed
Issue 2 June 1995
50
X300 EDM
Fue Emission Control & Engine Management
-
-
6)
P 0328
P 0333
KS 1 Circuit High Input
KS 2 Circuit High Input
When the closed loop knockcontroller is unable to adjustthe background noise average to within a defined band either
side of the reference background noise, then a knock sensor fault event has occurred. If the knock fault event counter
reaches a given threshold, then a low or high background noise knock fault is present.
Possible causes:
0 Background anomalously noisy for a cylinder on that bank
0 Radio Frequency Interference (RFI) adds to knock signal - harness shielding problem
0 Knock sensor A,B - over sensitive
0 ECM fault - knock ASK failed
Additional Information
Knock sensors use a piezo-electric sensing element to detect broad band (2kHz to 20 kHz) engine accelerations.
Output of sensor:
X300 EDM
Charge sensitivity = 37.5 pC / g nominal
Voltage sensitivity = 29 + 15% mV / g
51
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
F R O N T K N O C K SENSOR - RENEW
SRO
rn
.
rn
.
rn
rn
18.30.67
Open the hood and fit a wing cover.
Remove the battery cover.
Disconnect the battery ground lead.
Remove the air pump. See Section 5.1 of the VSM.
Disconnect the knock sensor harness multi-plug.
Undo and remove the front knock sensor.
Fitting a new front knock sensor is the reverse of the removal procedure.
I
JI2.813
Fia. 1
REAR K N O C K SENSOR - RENEW
SRO
rn
.
rn
rn
rn
rn
18.30.68
Open the hood and fit a wing cover.
Remove the battery cover.
Disconnect the battery ground lead.
Raise the vehicle on a four post ramp
From underneath the vehicle disconnect the knock sensor harness multi-plug.
Undo and remove the knock sensor.
Fitting a new rear knock sensor is the reverse of the removal procedure.
Issue 2 June 1995
52
X300 EDM
Fuel, Emission Control & Engine Management (AJI6)
0
CRANKSHAFT POSITION SENSOR - CKPS
P 0335
P 0336
Group 12
Monitoring Procedure
If CMP signals are detected which indicate engine rotation
above a given speed without any signal from a crankshaft
sensor, then a fault is present. If the crankshaft gear teeth
count is incorrect by more than one tooth, then a fault event
is registered and if the number of fault events exceeds the
limit without the engine synchronising then a crankshaft inaccurate fault is present.
The strategy will report to the Diagnostic Status Manager
(DSM) when a crankshaft inaccurate fault is present and the
DSM will then decide whether to store a fault code and illuminate the MIL Lamp.
The CKP and CMP are tested by cross checking the output of
the sensors and identifying when only one sensor is operating. A tooth position check will test that all tooth edges are
being correctly detected and the 'missing tooth' gap is present. As the CKPS is central to engine management system
operation the engine cannot run with a CKPS circuit fault.
Fig. 1 Location of CKPS
The average engine speed is measured using the camshaft
sensor during stall. If the engine speed is greater than a
threshold then a crankshaft position sensor fault is present.
-
CKP
-
I
+
d
Pl111/002
J91- 5 0 6
Fig. 2 Interface between ECM & CKPS
X300 EDM
53
Issue 2 June 1995
m
.
Fuel, Emission Control & Engine Management (AJl6)
-
CKP Circuit
0
Possible causes:
0 Crank sensor not fitted correctly - hanging loose
0 Reluctor ring fault - not fixed to crank
0 Crank sensor harness open circuit or short circuit to ground
0 Crank sensor fault
0 ECM interface circuit fault
CKP Circuit Range / Performance
P 0336
The CKPS counts the number of teeth between the ‘missing tooth’ gaps. If the tooth count is incorrect by more than
one tooth, above or below the actual number of teeth, then a missing tooth fault event has occurred. If a number of
fault events occur without the engine synchronising then a crankshaft range / performance fault is present.
Possible causes:
0 Damaged reluctor ring
0 Magnetic debris on reluctor ring
0 Radio Frequency Interference (RFI) problem with crank sensor wiring
m
CRANKSHAFT POSITION SENSORS (CKPS) - RENEW
.
.
SRO
18.30.12
Open the hood and fit a wing cover.
Disconnect the CKPS harness multi-plug and release from
the mounting bracket.
Undo and remove the sensor securing bolt and remove
the sensor.
Clean the mating faces.
.
Fitting a new CKPS is the reverse of the removal procedure.
Fin. 1 Location of CKPS
Issue 2 June 1995
54
X300 EDM
Fuel, Emission Control
e
CAMSHAFT POSITION SENSOR - CMPS
Monitoring Procedure
If the engine is turned and there is no camshaft signal, then
a camshaft sensor fault is present, so the system is synchronised using the crankshaft sensor alone. Synchronization
ensures that ignition coils are actuated in the normal sequence but if after a number of engine revolutions the engine does not start, then the actuating sequence is shifted by
one engine revolution. If after a number of engine revolutions the engine does not start, then the sequence shifting
is repeated until the engine is running. To detect faults the
crank and camshaft sensor outputs are cross checked plus
a crankshaft ‘missing tooth’ position check.
The strategy will report to the Diagnostic Status Manager(DSM) when a crankshaft inaccurate fault is present and
the DSM will then decide whether to store a fault code and
illuminate the MIL Lamp.
Fig. 1 Location of CMPS
I
The CKP and CMP are tested by cross checking the output of
the sensors and identifying when only one sensor is operating.
Fig. 2 CMPS
ECM
Supply Signal
PI1lzl001
1
1
5
P1112/002
I
I
IXI
-I
i
I
Ground
CMP
Fig. 3 Interface between ECM & CMP
X300 EDM
55
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
CMP Circuit
Possible causes:
0 CMPS out of alignment
0 Radio Frequency Interference problems on CMPS line
0 CMPS sensor tooth damage
0 CMPS sensor fault
-
-
6
.
. _. .
L
Issue 2 June 1995
56
X300 EDM
Fuel, Emission Control & Engine Management (AJ16)
IGNITION COILS
P
P
P
P
P
P
Group 13
1361 / P
1363 / P
1365 / P
1371 / P
1373 / P
1375/P
1362
1364
1366
1372
1374
1376
Monitoring Procedure
Two tests on the current monitor signal, when the coils are turned on during normal engine running, check for the lack
of, or early, activation, which will imply that the coil was not fully charged when it was fired or that the coil charged
too quickly. If either of these tests is not passed then a fault event is recorded and when the limit is reached a fault is
registered. The ignition coil driver circuits have a current limiting system which will attempt to maintain ignition coil
operation with all fault conditions present.
The strategy will report to the Diagnostic Status Manager (DSM) when an ignition coil fault is present and the DSM
will then decide whether to store a fault code and illuminate the MIL lamp.
Fig. 1 Location of coils
0
The six sparking plugs each have individual ignition coils attached which are fitted flush with the camshaft cover and
concealed beneath a central cover plate.
Resistance = 0.75 ohm.
The coil assembly consists of coil body with an integral two
pin plug, a central electrode and extension housing. Problems with the ignition coils are detected using two tests on
signals checking the coil current which analyse the current
monitor signal when ignition coils are turned on during normal engine running. The coils are monitored to detect either
non or early activation.
w
J I B 205
Fin. 2 Coil Assembly
X300 EDM
57
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
Ignition Coil Cylinder 1 - No Activation
Ignition Coil Cylinder 2 - No Activation
Ignition Coil Cylinder 3 - No Activation
Ignition Coil Cylinder 4 - No Activation
Ignition Coil Cylinder 5 - No Activation
Ignition Coil Cylinder 6 - No Activation
P
P
P
P
P
P
1361
1362
1363
1364
1365
1366
0
ECM
Possible causes:
o Ignition coil open circuit, high resistance or inductance
0 Ignition LT harness open circuit or high resistance
0 Ignition LT harness short circuit to ground
0 Crank sensor problems -‘ringing’ or radio frequency
interference on line
0 ECM fault - ignition coil driver
0 ECM fault - ignition coil current sensing problem
Ignition
0
Spark Plug
I
191-508
Fig. 1 Interface between ECM &coil
Ignition Coil Cylinder 1 - Early Activation
Ignition Coil Cylinder 2 - Early Activation
Ignition Coil Cylinder 3 - Early Activation
Ignition Coil Cylinder 4 - Early Activation
Ignition Coil Cylinder 5 - Early Activation
Ignition Coil Cylinder 6 - Early Activation
P
P
P
P
P
P
1371
1372
1373
1374
1375
1376
Dwell
Possible causes:
0 Ignition coil short circuit, low internal resistance or inductance
0 Ignition LT harness short circuit
0 Ignition coil fault - inter winding short circuit on secondary
0 ECM fault - ignition coil driver
0 ECM fault - ignition coil current sensing problem
e
Voltego profile:
,*,.U
Spark
Duration
Fig. 2 Ignition coil characteristics
0
Issue 2 June 1995
58
X300 EDM
Fig. 1
Fuel, Emission Control & Engine Management (AJ16)
EXHAUST GAS RECIRCULATION - EGR
P 1400 / P 0400
P 1401
P 1408
P 1409
Group 14
Monitoring Procedure
The diagnostics for the EGR valve are split into five parts.
Range tests check the EGR thermistor and the pintle position
sensor. The controller and pintle position sensor are used
to monitorthe difference between the target and actual positions of the pintle.
The EGR thermistor is used to verify the flow of exhaust gas
in the EGR system. The Pulse Width Modulated (PWM)drive
circuit provides open / short circuit detection.
The EGR valve is situated on the inlet manifold between the
throttle body and the cylinder head.
Pintle Control
The difference between the target and actual pintle positions
is monitored; if it continually exceeds the limit over a set
time period then a fault is registered.
Fin. 1 Location of EGR valve
Range Tests
The pintle position sensor input is monitored to detect a high
or low out of range value; if it continually exceeds the limit
over a set time period then a fault is registered. The EGR
thermistor is monitored to detect a high out-of-range temperature.
Flow Rate
When the engine reaches test condition; i.e. engine speed
and load are within limits, coolant and air temperatures are
above the minimum setting and the throttle position is
below the limit; the EGR temperature is monitored and if it
does not rise above a limit within the set time period, then
a fault event has occurred. When sufficient fault events have
occurred then a fault is registered.
PWM Drive Hardware
The ECM, Pulse Width Modulated (PWM) drive hardware
will report open or short circuit faults directly. If the Pintle
position sensor has an out-of-range fault then the EGR will
be disabled. The strategywill reportto the Diagnostic Status
Manager (DSM) when an EGR fault is present and the DSM
will then decide whether to store a fault code and illuminate
the MIL Lamp.
J 18 221
Fig. 2 EGR valve, section
EGR Valve
The EGR valve consists of three main parts; the Solenoid, Pintle and Seat, and the Pintle Position Sensor. The Solenoid
provides a unidirectional magnetic field to act upon the armature, which is connected to the Pintle. The resulting force
acts to pull the Pintle away from the Seat so allowing exhaust gas to flow into the inlet manifold. Movement of the
armature and pintle is resisted by three forces; pressure drop across the pintle and seat area, gravity, and spring load
from the pintle position sensor.
Issue 2 June 1995
60
X300 EDM
Fuel, Emission Control
Engine Management
The continuously variable control of the flow of exhaust gas
into the inlet manifold is achieved by the pintle position sensor providing feedback to the ECM for closed loop control of
the pintle position. Pintle position feedback allows the ECM
to calculate fuel and spark corrections as well as exhaust gas
flow rate. The EGR Function Sensor, situated on the inlet
manifold between the throttle body and the EGR valve, is
used to verify the flow of exhaust gas in the EGR system.
m
,*L
EGR Position
lJ=
EGRValve
~ ~ ~ ~ i p e f r o m
Exhaust Manifold
Fig. 1 EGR & manifold, section
P1117/001
PI1171005
PHW035
\
EGR
Fig. 2 Interface between ECM & EGR (low power)
I ,
ECM
5V (clamped)
P1117/003
I
PI105/015
Mux
I
Y
I
.PH05/007
. . ..
-. .
..
J
-
J
J91-510
EGR
Fig. 3 Interface between ECM & EGR (high power)
X300 EDM
61
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
P 0400
EGR Flow or Function Sensor Open Circuit
The EGR temperature is monitored when the following conditions are met; engine speed and load are within limits,
coolant and air temperatures are above their threshold figures and the throttle position is below it’s threshold setting.
lfthe temperature, measured bythe EGR thermistor, does not rise above a given setting within a time limit, on a number
of occasions, then a fault is registered.
0
Possible causes of fault:
0 EGR function sensor or harness open circuit
0 Insufficient gas flowing in EGR circuit due to a leak
0 EGR function sensor loose
0 EGR function sensor contaminated or blocked
0 Insufficient gas flowing due to a blocked pipe or valve
0 IAT, TP or MAFS problem affecting test
P 7400
EGR Valve Position Control
The ECM monitors the difference between actual and demanded pintle valve position. If the pintle position error exceeds 10% for a set time period, then a pintle valve position fault is registered.
Possible causes of fault:
0 EGR pintle position sensor - incorrect voltage, partial short circuit or open circuit on sensor harness
0 Obstruction in valve
0 Valve seized
0 ECM and ignition switch problem
0 ECM to EGR drive stage problem
0 ECM to EGR control fault
0
P 1401
EGR Valve Position Circuit
The pintle valve position sensor input is monitored to detect a high or low out-of-range value, continuously for a time
period.
Signal range: 0 to 5 volts
Low out-of-range threshold: 0.37 volts
High out-of-range threshold: 4.80 volts
Possible causes of fault:
0 EGR pintle sensor harness open circuit or short circuit to supply or ground
0 EGR pintle sensor supply open circuit or short circuit to battery voltage or ground
0 EGR pintle sensor ground open circuit or short circuit to supply
0 EGR pintle sensor fault
0 ECM interface circuit error
0
0
Issue 2 June 1995
62
X300 EDM
Fuel, Emission Control & Engine Management
EGR Function Sensor
EGR temperature is controlled to a maximum of 400°C. The
function sensor output is checked for a high, out-of-range,
temperature; when this occurs more than a given number of
times then a fault is present.
Possible causes of fault:
o Harness short circuit to ground or supply
0 EGR function sensor fault
o ECM interface circuit fault
The EGR function sensor output varies with temperature, as
follows:
4.397V at 100°C.
3.696V at 200°C.
0.54V at 400°C.
Fig. 1 EGR function sensor location
118-237
Fig. 2 EGR function sensor assembly
EGR Valve Circuit
The ECM valve drive hardware will report open or short circuit faults directly.
Possible causes:
0 EGR drive harness open circuit or short circuit
0 EGR drive solenoid fault open circuit or short circuit
0 EGR driver fault
X300 EDM
63
Fuel, Emission Control & Engine Management (AJ16)
Additional Information
Figure 1 shows a graph of the EGR function sensor resistance with respect to temperature.
1000
100
01
t
w
f
10
0
w
M
.-
I
a
1
100
50
150
200
250
300
350
400
Temperature "C
J91-172
Fin. 1 Sensor resistance with respect to temperature
The voltage level for any temperature may be calculated by
taking the following readings and substituting them into the
formula. Figure 2 shows the test points.
VT = RT x 5V
Formula:
(1k8 + RT)
Examples:
20 "C
50 "C
100 "C
200 "C
400 "C
Issue 2 June 1995
GEMS
RT
RT
RT
RT
RT
= 2M5
= 635K
= 85k3
= 5k10
= Ok22
VT
VT
VT
VT
VT
WRT
= 4.996V
*
= 4.994v
= 4.397v
= 3.696V
J 91469
Fig. 2 Test points for calculation
= 0.540V
64
X300 EDM
Fuel, Emission Control
Engine Management
EXHAUST GAS RECIRCULATION (EGR) VALVE - RENEW
SRO
17.45.01
Fig. 1
The EGR valve is situated on the inlet manifold between the throttle body and the cylinder head.
Open the hood and fit a wing cover.
Open the trunk and remove the battery cover.
Disconnect the battery ground lead.
Disconnect the EGR valve harness multi-plug.
Undo and remove the EGR valve securing bolts.
Remove the EGR valve and valve gasket.
Clean the valve mating faces.
0
Fitting a new EGR valve is the reverse of the removal procedure.
EXHAUST GAS RECIRCULATION (EGR) FUNCTION SENSOR - RENEW
SRO
.
17.45.08
Open the hood and fit a wing cover.
Open the trunk and remove the battery cover.
Disconnect the battery ground lead.
Release the EGR sensor multi-plug from the mounting bracket and disconnect the multi-plug.
Undo and remove the EGR sensor.
Fitting a new EGR valve is the reverse of the removal procedure.
X300 EDM
65
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
SECONDARY AIR INJECTION SYSTEM
PO417
P 0413
P 0414
Group 15
0
Monitoring Procedure
The diagnostics for auxiliary air injection combine air flow and electrical circuit monitoring.
Air Flow Monitoring
In hot idle conditions, oxygen sensor feedback is used to detect the auxiliary air injected into the exhaust. If a change in
the exhaust condition is detected then the test is passed, if
not, a fault is present. There is no default strategy.
Electrical Circuit Monitoring
An open or short circuit fault in the Secondary Air Injection
(AIR) pump drive relay circuit will be reported directly by the
ECM hardware to the Diagnostic Status Manager DSM. The
strategy will report to the DSMr when an AIR fault is present
and the DSM will then decide whether to store a fault code
and illuminate the MIL lamp.
0
The electric air pump is situated at the front left side of the
engine.
Fig. 1 Location of Air Pump
Description
The electric AIR pump is a regenerative turbine type which is permanently lubricated and requires no periodic maintenance. The pump draws air from the air cleaner and pumps it under pressure to the check valve mounted near the exhaust manifold; this check valve will prevent exhaust gas blowing back to the pump. Battery voltage to the AIR pump
is supplied through the AIR pump relay which is controlled by the ECM. The pump has an integral, solenoid operated,
stop valve which operates with the pump. When the pump is not operating the solenoid valve is at rest preventing
air flow through the pump.
AIR pump operation is only possible when the coolant temperature is at or below 16°C. The system will run for 15 seconds at engine start-up or until the coolant reaches 16°C; the maximum pump running time is four minutes. The ECM
checks the AIR system air flow using the electrical circuit and lambda feedback detecting additional air in the exhaust.
ECM
P1146/003
P1146/005
I
I
4.A t
I
AIR
J91-511
Fig. 2 Interface between ECM and AIR
Issue 2 June 1995
66
X300 EDM
Fuel, Emission Control & Engine Management (AJI6)
-
PO417
AIR Insufficient Flow
Possible causes:
0 AIR pipe blocked
0 AIR pipe ruptured
0 AIR pump permanently off
0 AIR pump fault
0 AIR pump wiring fault (between pump and relay)
0 AIR relay fault
0 ECM fault -AIR relay fault
P 0413
AIR Switching Valve Open Circuit
Possible causes:
0 AIR relay missing or open circuit
0 AIR relay harness open circuit or short circuit to battery voltage
0 ECM relay driver open circuit
0 ECM fault
P 0414
Air Switching Valve Short Circuit
Possible causes:
0 AIR relay short circuit
0 AIR relay harness short circuit
0 ECM relay driver short circuit
0 ECM fault
9.0 r
Additional Information
Figure 1 shows a graph of airflow with respect to back pressure.
'-O
t
\
\
*1.0
-Or
0'
0
I
10
I
I
\A'
I
\
30
40
50
Back Pressure (H20)
20
60
J9,-L73
Fig. 1
X300 EDM
67
Issue 2 June 1995
I
Fuel, Emission Control & Engine Management (AJ16)
AIR PUMP - RENEW
SRO
..
8
77.25.07
Open the hood and fit a wing cover.
Disconnect the air pump harness multi-plug.
Slacken the air pump inlet and outlet hose securing clips
and disconnect the hoses.
Undo and remove the three air pump to mounting bracket
securing bolts. Remove the air pump.
Remove the air pump rubber mounts.
.
.
.
Refitting the air pump is the reverse of the removal procedure.
Fig. 1
Issue 2 June 1995
68
X300 EDM
CAT
Lean
CAT
Rich
upstream
J91-4 67
’
Downstream
Fig. 1 Catalyst Characteristic
/
.-
Fuel, Emission Control & Engine Management (AJl6)
EVAPORATIVE EMISSION CONTROL - EVAP
Group 17
P 0441
P 0443
Monitoring Procedure
When a large fuelling correction is detected by the oxygen sensors during purging, the purge valve flow test is passed
and no further action is taken. If the purge valve flow test is not passed, the purge valve is ramped open from the fully
closed position when closed loop idle speed control is active. Any changes in lambda feedback correction and air bypass valve position are monitored to detect the effect of the purge valve flow. A fault is confirmed if no effect is detected.
The strategy will report to the Diagnostic Status Manager (DSM) when an EVAP monitoring fault is present and the DSM
will then decide whether to store a fault code and illuminate the MIL Lamp.
Fig. 1 Carbon Canister and Valve Assembly
The evaporative carbon canister is located on the LH side of the vehicle in front of the rear axle. North American vz
hicles; a secondary carbon canister is located on the RH side of the vehicle, opposite the primary carbon canister.
The purge valve is located below the LH headlamp module.
Evaporative Emission Control, (EVAP), limits the escape of fuel vapour from the fuel tank into the atmosphere. The
fuel tank iscapableof beingfilledto approximately90%of itsvolume, theadditional 10% isavolumeofairwhich allows
forexpansion ofthefuel without itescapingfrom thetank. Theairabovethefuel inthetankischarged with fuelvapour,
which if the tank was allowed to vent to atmosphere, would escape as a pollutant.
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In order to collect the vapour, the tank is vented through a canister (1 Fig. 1) packed with activated carbon. The fuel
vapour is adsorbed onto the carbon and held there until the ECM commands the EVAP control valve (2Fig. 1) to open
and allow manifold depression to draw air through the carbon via the controlled entry port (3 Fig. 1). The flow of air
through the carbon picks up vapour from the fuel which has been adsorbed by the carbon, so carrying the vapour to
the inlet manifold (4 Fig. 1) to supplement the fuel injected, and be consumed.
When the engine is at rest the fuel tank is maintained at a positive pressure of 1.0 to 1.33 Ib/in2 by the pressure control
valve (5Fig. 1); pressure above this setting is released, by the valve, to the carbon canister. When the engine is running,
the line (6Fig. 1) from the inlet manifold to the pressure control valve is subject to manifold depression which activates
the valve, so opening the line to the canister, allowing air drawn through the canister to replace the fuel withdrawn,
to maintain atmospheric pressure in the fuel tank. If the Dressure control valve is inoDerative. over Dressurisation of
the fuel tank is prevented by the fuel filler cap having a pressure release setting of 2.0 to 2.5 Ib / in2.'
Fig. 1 EVAP Circuit
X300 EDM
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Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
EVAP Purge Flow
P 0441
The purge valve is ramped open from the fully closed position during conditions when closed loop idle speed control
is active. Changes in lambda feedback correction and air bypass valve position are monitored to detect the effect of
the purge valve flow. A fault is confirmed if no effect is detected.
Possible causes:
o Purge valve fault - sticking
o Purge valve blocked
o Purge pipework blocked
o Purge to manifold pipe blocked or ruptured
o AIR pump stuck on - masks purge flow
o Auxiliary loads rise and fall to exactly match increase / decrease in purge flow
o Very low atmospheric pressure - insufficient to drive purge mixture through to engine
EVAP Purge Control Valve Circuit
P 0443
Possible causes:
o Purge valve connector open circuit
o Purge valve wiring open circuit or short circuit to ground or short circuit to battery voltage
o ECM fault - purge valve drive stage failed
o ECM fault - SOD fault
-
PURGE CONTROL VALVE RENEW
SRO
17.75.30
Open the hood and fit a wing cover.
Displace and remove the fastener securing the air cleaner
to front panel blanking cover. Remove the blanking cover.
Release the air cleaner cover retaining clips. Remove the
cover and the filter element.
Displace and remove the filter cover from the inner wing
grommet.
Disconnect the purge valve connector.
Release the clip securing the canister to purge valve hose.
Disconnect the hose from the purge valve.
Disconnect the elbow from the front of the purge valve.
Undo and remove the purge valve mounting nuts.
Displace and remove the purge valve from the mounting
bracket.
.
.
.
.
9
.
Fig. 1
Refitting the purge valve is the reverse of the removal proced ure.
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Fuel, Emission Control & Engine Management (AJ16)
VEHICLE SPEED SENSOR - VSS
Group 18
P 0500
Monitoring Procedure
An engine load test will check for a sustained high engine load being present within a given range of engine speeds
and a low road speed.
The tests will be different for manual and automatic transmission vehicles.
Electronic automatic transmission vehicles have a test using the transmission retard request signal; if these requests
are being made at a low road speed then the test will fail.
No default strategy is applied to the road speed input.
If these tests are not passed then a fault event has occurred.
When sufficient fault events have occurred then a fault is registered.
The strategy will report to the Diagnostic Status Manager (DSM) when a VSS monitoring fault is present and the DSM
will then decide whether to store a fault code and illuminate the MIL Lamp.
Vehicle Speed Sensor - VSS
P 0500
Possible causes:
o Transmission CM fault - sends ignition retard requests whilst stationary
o Road speed sensor fault
o Road speed signal pulled down by another consumer ECM
o Road speed signal swamped by Radio Frequency Interference (RFI)
o Road speed signal wrongly sent by another ECM
o ECM load signal is wrong high - but undetected
X300 EDM
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
IDLE SP€ED CONTROL - ISC
Group 19
P 0506
P 1507
P 1508
P 1509
Monitoring Procedure
Open and short circuit problems with the ISC stepper motor and wiring are detected by sampling the stepper motor
coils fault status lines from the Serial Output Device. Stepper motor coils are checked for open circuit after referencing,
during power down; the power to the stepper motor is not removed until after this test and if a given number of consecutive faults occur on any coil, an open circuit fault is present.
Both ends of the stepper motor coils are checked for short circuit during power down referencing and if a given number
of fault events occur for any coil, then a short circuit fault is present.
The closed loop test monitors the cumulative opening and closing idle speed control steps, a fault being registered
when the steps exceed the limits without causing a corresponding change in airflow rate.
If these tests are not passed then a fault event has occurred. When sufficient fault events have occurred then a fault
is registered. The strategy will report to the Diagnostic Status Manager (DSM) when an ISC monitoring fault is present
and the DSM will then decide whether to store a fault code and illuminates the MIL Lamp.
Fig. 1 Location of ISC
Issue 2 June 1995
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X300 EDM
Fuel, Emission Control & Engine Management
0
Fig. 1 idle Speed Control Valve
0
Fig. 2 Sectioned Throttle Body with lSCV
0
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Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
ISC RPM Low
P 0506
During closed loop control a test monitors the cumulative opening and closing ISC steps, a fault being logged when
the cumulative steps applied in either direction exceed threshold values, without having caused a corresponding increase or decrease in airflow rate to beyond threshold values.
Threshold number of cumulative steps: 120
Minimum coolant temperature for diagnostic to operate 79°C
Minimum engine speed for diagnostic to operate manual 485rpm
Minimum engine speed for diagnostic to operate auto 485rpm
Minimum engine speed for diagnostic to operate manual only 75%
Possible causes:
o ISC passages blocked
0 ISC stepper motor jammed
0 ISC stepper motor incorrectly mounted
0 Air flow meter fault - output stuck
0 ISC motor disconnected
0 Engine not running properly - e.g. open throttle and still at idle
ISC RPM High
PO507
During closed loop control a test monitors the cumulative opening and closing ISC steps, a fault being logged when
the cumulative steps applied in either direction exceed threshold values, without having caused a corresponding increase or decrease in airflow rate to beyond threshold values.
Possible causes:
0 Base idle set too high
0 ISC passages blocked
0 ISC stepper motor jammed
0 ISC stepper motor incorrectly mounted
0 Airflow meter fault - output stuck
0 ISC motor disconnected
o Air leak passed throttle
ISC Open Circuit
P 1508
Open and short circuit tests check for hardware failures by monitoring the stepper motor coils fault status lines.
The open circuit test checks for open circuit stepper motor coils during power-down, after ISC power-down referencing (which enables the ECM to align the valve to a reference opening). The power to the stepper motor is not removed
until after this test. During a power-down, if a given number of consecutive fault events occur for any coil, then an
ISC open circuit fault is present.
The short circuit test checks both ends of the stepper motor’s coils during power down referencing. During a power
down, if a given number of consecutive fault events occur for any coil, then an ISC short circuit fault is present.
Possible causes:
0 ISC wiring open circuit in one or more wires
0 ISC stepper motor fault - open circuit coil
0 ECM fault - open circuit coil drive
ISC Short Circuit
P 1509
Open and short circuit tests check for hardware failures by monitoring the stepper motor coils fault status lines.
The open circuit test checks for open circuit stepper motor coils during power-down, after ISC power-down referencing (which enables the ECM to align the valve to a reference opening). The power to the stepper motor is not removed
until after this test. During a power-down, if a given number of consecutive fault events occur for any coil, then an ISC
open circuit fault is present.
The short circuit test checks both ends of the stepper motor coils during power down referencing. During a powerdown, if a given number of consecutive fault events occur for any coil, then an ISC short circuit fault is present.
Issue 2 June 1995
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X300 EDM
IDLE SPEED CONTROL VALVE/ GASKETS (NORMALLY ASPIRATED), RENEW
5.1.8
SRO
18.30.74 IDLE SPEED CONTROL VALVE
SRO
18.30.77 IDLE SPEED CONTROL VALVE GASKET
..
Remove
Disconnect the battery ground lead.
Remove the intake elbow to throttle housing hose.
Disconnect idle speed control valve multi-plug.
Disconnect throttle potentiometer multi-plug.
Remove clevis pin circlip.
Reposition link arm from quadrant.
Disconnect kick-down cable (where fitted) from quadrant.
Open throttle fully and disconnect inner cable from quadrant.
Carefully release throttle against stop.
Fit pipe clamps to throttle body heater feed and return
hose.
Disconnect feed hose from throttle body stub pipe.
Remove throttle body assembly from inlet manifold.
Remove idle speed control valve from throttle body.
Remove gasket.
Retrieve distance piece from throttle body recess.
..
..
.
..
..
..
.
9
Fig. 1
Refit in the reverse order of the removal procedure.
X300 EDM
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Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
PARK/ NEUTRAL POSITION SWITCH - PNPS
P 1514
Group 20
0
P 1516
P 1517
Monitoring Procedure
The PNPS is tested for incorrectly indicating neutral by detecting gear changes in electronic automatic transmission
or high load conditions. The PNPS is tested for incorrectly
indicating drive, by cranking. If these tests are not passed
then a fault event has occurred. When sufficient fault events
have occurred then a fault is registered.
i
The strategy will report to the Diagnostic Status Manager
(DSM) when a PNPS monitoring fault is present and the
DSM will then decide whether to store a fault code and to illuminate the MIL Lamp.
Three tests check the operation of the Neutral / Drive switch.
0 The Drive position test will check for engine conditions that indicate that the transmission is in Neutral
while the switch indicates Drive.
0 The high load test establishes that there is a false indication of Neutral from the Neutral / Drive switch by
checking for high engine load whenever high engine
speed is seen in Neutral; high load indicates that the
transmission is in Drive and low load implies Neutral.
0 The gear change test on an electronically controlled
automatic transmission involves monitoring for gear
change requests while the switch indicates Neutral.
0
10
9
6
4
5
J44 - 708
Fig. 1 PNPS Location
If these tests are not passed then the appropriate fault count
will be incremented.
High Load Neutral / Drive
Test checks whether the Neutral / Drive switch is incorrectly
indicating neutral, by detecting high engine load conditions
or gear changes (on automatic transmission vehicles).
In neutral if engine load up to 47.8% and engine speed up to
1900 rpm then fault counter incremented.
P 7514
I '
\
I
I
c-
Possible causes:
0 ECM signal is wrong but undetected
0 Neutral / Drive switch falsely shows Neutral.
0 Neutral / Drive wiring / connector short circuit to
ground
0 Neutral / Drive wiring pulled low by other ECM
Fig. 2 Component Detail / Schematic
issue 2 June 1995
X300 EDM
or gear changes (on automatic transmission vehicles).
This test monitors for gear change request signals whilst the Neutral / Drive switch indicates neutral.
Possible causes:
o Neutral / Drive switch falsely shows N
o Neutral / Drive wiring / connector short circuit to ground
0 Neutral / Drive wiring pulled low by other ECM
0 Transmission ECM fault - sending extra ignition retard requests
0 Road speed sensor fault - but undetected
0 Road speed signal pulled down by another consumer ECM - but undetected
0 Road speed signal swamped by Radio Frequency Interference (RFI) - but undetected
o Road speed signal wrongly sent by other ECM - but undetected
Cranking Neutral / Drive
0
A test checks for whether the Neutral / Drive switch is incorrectly indicating drive by detecting cranking.
Possible causes:
o Neutral / Drive switch falsely shows D
0 Cranking inhibit not working with switch in D
0 Neutral / Drive wiring /connector open circuit
o Neutral / Drive wiring pulled high by other ECM
o Neutral / Drive wiring /connector short circuit to voltage source
0 ECM engine speed signal corrupted to look like cranking - Radio Frequency Interference (RFI)
Fuel, Emission Control & Engine Management (AJ16)
ENGINE CONTROL MODULE (ECM)
Group 21
P 1607
P 1621
P 1622
MIL Output Circuit
P 1607
A hardware test is carried out on the MIL Lamp by the ECM. The instrument pack’bulb-check‘ period, afterthe ignition
is switched on, is used to drive the MIL Lamp ‘on’ and ‘off’ for a period of time. This allows the diagnosis of open and
short circuit faults. Two successive trips within which the diagnostic indicates a fault will lead to a fault being stored.
Monitoring Procedure
The bulb check period, after the ignition has been switched on, is used by the MIL Lamp managerto drive the MIL Lamp
both on and off, which allows the hardware to diagnose both open and short circuits.
The strategy will report to the Diagnostic Status Manager (DSM) when a MIL Lamp monitoring fault is present and the
DSM will then decide whether to store a fault code and illuminate the MIL Lamp.
Possible causes:
0 Wiring / connector fault in MIL Lamp harness
o Body computer to GEMS harness connector - open circuit or short circuit
0 GEMS ECM hardware monitor faulty
ECM Engine Immobilisation Input Circuit Malfunction
P 1621
A range check on the diagnostic L-line is performed to check for voltages outside expected limits.
On detecting out of range voltages the appropriate fault code is stored and MIL lamp illuminated.
P 1622
Engine Immobilisation Input Code Malfunction
With the ignition ’on‘, and the security system ‘disarmed’ the security ECM transmits the appropriate authorisation
code to the ECM. If the ECM receives two identical incorrect; or three different incorrect; authorisation codes from the
security ECM; then this will be interpreted as an illegal attempt to start the vehicle.
On detection of an illegal attempt to start the vehicle, a fault code will be stored and the MIL Lamp illuminated.
Issue 2 June 1995
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Fuel, Emission Control & Engine Management (AJl6)
~~
~
L@
CODES COMMON T O ECM A N D TCM
P 0605
Group 22
TCM
I
r---lWatchdog
liI
U
d
TCM 55-way connector
J86 -1828
Fig. 1 Internal Relay Circuit Schematic
Internal Control Module ROM Test Error
0
P 0605
On each power-up, the ECM accesses its Electrically Erasable Programmable Read Only Memory (EEPROM)where it
has stored DTC codes which have been flagged; freeze frame data logged at the time of those flaggings; and adaptive
fuelling values. If a retrieved parameter does not correspond to what the ECM knows to being a ’sensible’value, then
it will re-access that memory location up to two more times to try to obtain a such a value.
If a ’sensible’ value for a parameter accessed from EEPROM is not received after three attempts then the fault code is
stored and the MIL Lamp illuminated.
During initialization and operation the background diagnostics run a checksum on the data in the EEPROM. The checksum is performed on 20 bytes each programme cycle and the results are summed to achieve a complete checksum.
If a fault is already logged then a complete checksum will be performed during initialization. When a checksum error
is detected, the TCM will adopt the default function and store this fault code.
If this fault is permanently flagged, then the TCM should be replaced taking care to obtain the correctly programmed
variant.
X300 EDM
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Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
TRANSMISSION
P
P
P
P
Group 23
A
B
D
F
H
J
K
L
M
Road Speed Sensor
Pressure Regulator
Oil Temperature Signal
Road Speed Sensor
M V I Solenoid
Oil Temperature Ground
MV2 Solenoid
M W K Solenoid
Solenoid Supply
1775
1776
7777
1794
K
0
OB\
Fig. 1 Transmission Connector (GB003)
The solenoid valves are located on the valve block in the transmission assembly and can be identified by their position.
Connection is made via a connector located on the LHS of the transmission assembly.
Resistance Checks Between Connector Contacts
28 to 60 ohm: M to L, M to K, M to H
33 to 67 ohm: L to B, K to B, H to B
56 to 120 ohm: L to K, L to H, K to H
5 t o 7 ohm M to B
Open circuit: the combination of any one contact from each row M K L H B A D F J
Issue 2 June 1995
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Fuel, Emission Control & Engine Management
v
Y
I
Transmission MIL
I
P 1775
~
Monitoring Procedure
The ignition retard request line, from the TCM to the ECM, indicates when an emission-related fault is present in the
automatic transmission.
The strategy will report to the Diagnostic Status Manager (DSM) when a MIL Lamp monitoring fault is present and the
DSM will then decide whether to store a fault code and illuminate the MIL Lamp.
Possible causes:
0 Transmission ECM sent MIL Lamp request
0 Possible wrong Pulse Width Modulation (PWM) message received
P 1776
Ignition Retard Request Duration
Monitoring Procedure
If the ignition retard request line indicates a request for longer than the time limit, then there is a fault.
The strategy will report to the Diagnostic Status Manager (DSM) when a MIL Lamp monitoring fault is present and the
DSM will then decide whether to store a fault code and illuminate the MIL Lamp.
Possible causes:
0 Transmission ECM fault - retard request for too long
0 Driver repeatedly requests shifts which require repeated ignition retard requests may not be possible
P 1777
Ignition Retard Request Circuit
Monitoring Procedure
The status of the TCM ignition retard request line is tested for hardware fault events. There is no automatic transmission default strategy so all faults that require such a strategy will be administered by the TCM.
---
The strategy will report to the Diagnostic Status Manager (DSM) when a MIL Lamp monitoring fault is present and the
n e n n ...:II .I--A--:A.-.I--&I---~-I Ll d. .UI &l L G--U-IU..e d--A
:II..-:..-L-+L.nail I
llU
U31VI
Possible causes:
0 Transmission
0 Transmission
0 Transmission
0 Transmission
ECM error - sends invalid Pulse Width Modulation (PWM)
ECM to GEMS harness connector open circuit
ECM to GEMS harness connector short circuit to ground
ECM to GEMS harness connector short circuit to battery voltage
System Voltage
P 1794
The TCM monitors the supply voltage and will log this fault if the voltage is less than 10.5V when the engine speed is
greaterthan 1600rpm. This fault code is unlikelyto becaused bya fault within theTCM and assuch thevehicle harness
and fuses etc. should be completely tested before the TCM is condemned.
Possible causes:
0 Battery capacity low.
0 Faulty fuse.
0 Fault in harness.
X300 EDM
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84
Fuel, Emission Control & Engine Management (AJ16)
MASS AIR FLOW SENSOR
- POlOl
Symptom Chart
CONDITION
POSSIBLE SOURCE
ACTION
correct proceed to pinpoint test A7
Check for inlet air leak, if found rectify and
proceed to pinpoint test A7
Check for inlet / exhaust blockage, if found
rectify and proceed to pinpoint test A7
Check harness and connector condition /
integrity with ignition off if faulty rectify and
proceed to pinpoint test A7
If faults not found, proceed to pinpoint test A I
I
Pinpoint Tests
TEST STEP
Check harness continuity PI 116/002 to ECM
pin PI 105/004
RESULT
OK
Open Circuit
A2
Check harness continuity PI 116/003 to ECM
pin PI 105/029
OK
Open Circuit
A3
Check harness insulation PI 116/002 to
ground
OK
Short circuit
A4
Check 12V +ve supply to PI 116/001 and
continuity PI 116/003 to ground
OK
Incorrect
A5
Check throttle position read PID 11h
OK
Incorrect
AI
e
0
A6
Check MAFS
A7
Clear fault code and perform service drive
:ycle to verify fault cleared
A8
Return to Symptom Chart and repeat
diagnostic procedure
ACTION
Proceed to A2
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to A7
I
I Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Proceed to A5
Locate and rectify wiring fault,
re-connect harness and proceed to A7
I Proceed to A6
I
I
I
Re-calibrate throttle and proceed to
~7
OK
Proceed to A7
Incorrect
Repair or renew MAFS, re-connect
harness and proceed to A7
OK
stop
Fault still present I Proceed to A8
1
Fault still present I Contact Jaguar Service Hotline
0
X300 EDM
I
85
Issue 2 June 1995
I
I
Fuel, Emission Control & Engine Management (AJ16)
MASS AIR FLOW SENSOR - PO102
Symptom Chart
POSSIBLE SOURCE
ACTION
-Check fault run engine - read PID IOh, if
correct proceed to-pinpoint test A6
Check for inlet / exhaust blockage, if found
rectify and proceed to pinpoint test A6
Check harness and connector condition /
integrity with ignition off, if faulty rectify and
proceed to pinpoint test A6
1 MAFS Low Input fault
_.
I If faults not found,
proceed to pinpoint test A I
Pinpoint Tests
TEST STEP
I
IAl Check harness continuity PI 116/002 to ECM
pin PI 105/004
=
RESULT
OK
Open Circuit
Check harness continuity PI 116/003 to ECM
pin PI 105/029
b
OK
Open Circuit
Check harness insulation PI 116/002 to
ground
OK
Short circuit
I A4
Check 12V +ve supply to PI 116/001 and
continuity PI 116/003 to ground
OK
Incorrect
I AS
Check MAFS
OK
Incorrect
A2
I A7
ACTION
Proceed to A2
Locate and rectify wiring fault,
reconnect harness and proceed to A6
I Proceed to A3
Locate and rectify wiring fault,
reconnect harness and proceed to A6
Proceed to A4
Locate and rectify wiring fault,
reconnect harness and proceed to A6
I Proceed to A5
Locate and rectify wiring fault,
reconnect harness and proceed to A6
Clear fault code and perform service drive
cycle to verify fault cleared
Proceed to A6
Repair or renew MAFS, re-connect
harness and proceed to A6
OK
stop
Fault still present Proceed to A7
Return to Symptom Chart and repeat
diagnostic procedure
OK
Fault still present
Issue 2 June 1995
86
I Stop
I Contact Jaguar Service Hotline
X300 EDM
CONDITION
Fault code PO103
I
POSSIBLE SOURCE
MAFS High Input fault
I
Pinpoint Tests
0
AI
TEST STEP
Check harness continuity PI 1161003 to
chassis ground
RESULT
OK
Open circuit
A2
Check MAFS
OK
Incorrect
A3
Perform service drive cycle to verify fault
cleared
Return to Symptom Chart and repeat
diagnostic procedure
OK
Fault still present
OK
Fault still present
A4
e
0
ACTION
Proceed to A2
Locate and rectify wiring fault,
re-connect harness and proceed to A3
Clear fault code and proceed to A3
Repair or renew MAFS, re-connect
harness and proceed to A3
stop
Proceed to A4
stop
Contact Jaguar Service Hotline
CONDITION
Fault code PO1 12
Fault code PO1 13
A1
POSSIBLE SOURCE
IAT Low Input fault
IAT High Input fault
TEST STEP
Check harness continuity PI 1051030 to PI
1061002
A2
Check harness continuity PI 1061001 to PI
105/001
A3
Check sensor resistance within limits
A4
Perform service drive cycle to verify fault
cleared
A5
Return to Symptom Chart and repeat
diagnostic procedure
Issue 2 June 1995
ACTION
Read PID OFh - check in range, if correct
proceed to pinpoint test A4
Check harness and connector condition I
integrity with ignition off, if faulty rectify and
proceed to pinpoint test A4
If fault not found, disconnect IAT and proceed
to pinpoint test A1
RESULT
OK
Open Circuit
ACTION
Proceed to A2
Locate and rectify wiring fault,
reconnect harness and proceed to A4
OK
Proceed to A3
Open Circuit
Locate and rectify wiring fault,
reconnect harness and proceed to A4
Yes
Clear fault code and proceed to A4
No
Fit new IAT sensor, re-connect
harness and proceed to A4
OK
stop
Fault still present Proceed to A5
OK
stop
Fault still present Contact Jaguar Service Hotline
88
X300 EDM
Fuel, Emission Control & Engine Management (AJI6)
ENGINE COOLANT TEMPERATURE SENSOR - PO1 16
Symptom Chart
POSSIBLE SOURCE
CONDITION
II Fault code PO116
I ECT Range / Performance fault
I
I
I
I
1
ACTION
II Turn ignition off
I
I
I
Check harness and connector condition I
integrity with ignition off, if faulty rectify and
proceed to pinpoint test A2
I If fault not found,
proceed to pinpoint test A l
I
I
I
Pinpoint Tests
TEST STEP
Remove thermostat to check operation
Perform service drive cycle to verify fault
cleared
Return to Symptom Chart and repeat
diagnostic procedure
0
X300 EDM
RESULT
OK
I Incorrect
OK
Fault still oresent
OK
Fault still present
I
89
ACTION
Proceed to A2
I Fit new thermostat and proceed to A2 I
stop
I Proceed to A3
stop
II Contact Jaguar
- Service Hotline
I
I
Issue 2 June 1995
Engine Management (AJ16)
CONDITION
AI
TEST STEP
Check harness continuity PI 1051031 to PI
1071002
A2
Check harness continuity PI 107/001 to PI
105/014
A3
Check sensor resistance within limits
A4
Clear fault code and perform service drive
cycle to verify fault cleared
A5
Return to Symptom Chart and repeat
diagnostic procedure
issue 2 June 1995
ACTION
Read PID 05H - check in range, if correct
proceed to pinpoint test A4
Check harness and connector condition I
integrity with ignition off, if faulty rectify and
proceed to pinpoint test A4
If fault not found, disconnect ECT sensor and
proceed to pinpoint test AI
POSSIBLE SOURCE
RESULT
,
ACTION
Proceed to A2
Locate and rectify wiring fault,
reconnect harness and proceed to A4
Proceed to A3
OK
Open circuit
Locate and rectify wiring fault,
reconnect harness and proceed to A4
I OK
I Proceed to A4
incorrect
Renew sensor, reconnect harness
and proceed to A4
OK
stop
Fault still present Proceed to A5
OK
stop
Fault still present Contact Jaguar Service Hotline
OK
Open circuit
90
I
X300 EDM
Fuel, Emission Control
ENGINE COOLANT TEMPERATURE SENSOR - PO1 18
Symptom Chart
CONDITION
POSSIBLE SOURCE
Pinpoint Tests
RESULT
AI
0
A2
A3
Check harness continuity PI 105/031 to PI
107/002
OK
Check harness continuity PI 107/001 to PI
105/014
OK
Check sensor resistance within limits
OK
Open circuit
Open circuit
Incorrect
A4
Clear fault code and perform service drive
cycle to verify fault cleared
OK
A5
Return to Symptom Chart and repeat
diagnostic procedure
OK
0
0
X300 EDM
Fault still present
Fault still present
ACTION
Proceed to A2
Locate and rectify wiring fault,
re-connect harness and proceed to A4
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to A4
Proceed to A4
Renew sensor, re-connect harness
and proceed to A4
stop
Proceed to A5
stop
Contact Jaguar Service Hotline
.
Fuel, Emission Control & Engine Management (AJ16)
-
0
CONDITION
Fault code PO125
AI
POSSIBLE SOURCE
ECT Excessive Time to Enter Closed
Loop Fuel Control
TEST STEP
Remove thermostat to check operation
A2
Perform service drive cycle to verify fault
cleared
A3
Return to Symptom Chart and repeat
diagnostic procedure
ACTION
Check harness and connector condition I
integrity with ignition off, if faulty rectify and
proceed to pinpoint test A2
If fault not found, remove thermostat and
proceed to pinpoint test A I
RESULT
ACTION
OK
Proceed to A2
Incorrect
Fit new thermostat and proceed to A2
OK
stop
Fault still present Contact Jaguar Service Hotline
OK
stop
Fault still present Contact Jaguar Service Hotline
0
0
a
Issue 2 June 1995
92
X300 EDM
Fuel, Emission Control
Engine Management (AJl
THROTTLE POSITION - PO721
Symptom Chart
POSSIBLE SOURCE
TP Range / Performance Fault
ACTION
Read PID 11H - check values correct when
throttle is held fully open /closed, if correct
proceed to pinpoint test A8
Switch ignition off
Check harness and connector condition /
integrity, if faulty rectify and proceed to
pinpoint test A8
If fault not found, disconnect TP sensor,
switch on ignition and proceed to pinpoint
test A I
Pinpoint Tests
AI
0
A2
A3
TEST STEP
Check 5V +ve at pin P1118/003 and OV at pin
PI 118/00 1
Check harness continuity PI 118/003 to PI
105/011
Check harness continuity PI 118/002 to PI
105/012
RESULT
ACTION
Switch off ignition and proceed to A2
Locate and rectify wiring fault,
re-connect harness and proceed to A8
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to A8
Locate and
Proceed
to A4
rectify wiring fault,
OK
Incorrect
,
I
Open circuit
Open circuit
re-connect harness and proceed to A8
A4
A5
A6
0
Check harness continuity PI 118/001 to PI
105/007
OK
Open circuit
I Proceed to A5
Locate and rectify wiring fault,
Check harness insulation PI 118/002 to PI
118/001
Connect multi-meter between TP terminals 1 OK
and 2. Move wiper arm slowly through its
Incorrect
range checking for smooth response in
meter resistance reading.
A7
Check for inlet / exhaust blockage
A8
Clear fault code and perform service drive
Gycle to verify fault cleared
A9
Return to Symptom Chart and repeat
diagnostic procedure
1
re-connect harness and proceed to A8
Proceed to A7
Repair or renew TP sensor,
re-connect harness and proceed to A8
Fit new TP sensor, re-connect harness
and proceed to A8
Blocked
1 Clear blockage and proceed to A8
OK
stop
Fault still present 1 Contact Jaguar Service Hotline
Clear
I
0
X300 EDM
93
Issue 2 June 1995
ACTION
Read PID 11H -check values correct when
throttle is held fully open I closed, if correct
proceed to pinpoint test A8
Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
pinpoint test A8
If fault not found, disconnect TP sensor,
switch on ignition and proceed to pinpoint
test A I
TEST STEP
RESULT
ACTION
AI
A2
A3
A4
105l007
A5
118/001
A6
A7
Check for inlet I exhaust blockage
A8
Perform service drive cycle to verify fault
cleared
A9
Return to Symptom Chart and repeat
diagnostic procedure
Issue 2 June 1995
Fit new TP sensor, re-connect
harness, clear fault code and proceed
to A8
I Blocked
I Clear blockage and proceed to A8
OK
stop
Fault still present I Proceed to A9
OK
stop
Fault still present I Contact Jaguar Service Hotline
Clear
I
I
I
94
X300 EDM
Fuel, Emission Control
THROTTLE POSITION - PO123
Symptom Chart
CONDITION
Fault code PO123
ACTION
Read PID 11H - check values correct when
throttle is held fully open / closed, if correct
proceed to pinpoint test A8
Switch ignition off
Check harness and connector condition /
integrity, if faulty rectify and proceed to
pinpoint test A8
If fault not found, disconnect TP sensor,
switch on ignition and proceed to pinpoint
test A I
POSSIBLE SOURCE
TP High Input Fault
Pinpoint Tests
AI
0
TEST STEP
Check 5V +ve at pin PI 118/003 and OV at pin
PI 118/001
re-connect harness and proceed to A8
A2
Check harness continuity PI 118/003 to PI
105/011
OK
Open circuit
A3
Check harness continuity PI 118/002 to PI
105/012
OK
Open circuit
A4
Check harness continuity PI 118/001 to PI
105/007
OK
Open circuit
Proceed to A5
Locate and rectify wiring fault,
re-connect harness and proceed to A8
A5
Check harness insulation PI 118/002 to PI
118/001
OK
Short circuit
Proceed to A6
Locate and rectify wiring fault,
re-connect harness and proceed to A8
A6
Connect multi-meter between TP terminals 1 OK
and 2. Move wiper arm slowly through its
Incorrect
range checking for smooth response in
meter resistance reading.
Check for inlet / exhaust blockage
Clear
A7
0
48
Perform service drive cycle to verify fault
cleared
49
Return to Symptom Chart and repeat
diagnostic procedure
X300 EDM
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to A8
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to A8
Proceed to A7
Repair or renew TP sensor,
re-connect sensor and proceed to A8
Fit new TP sensor, re-connect
harness, clear fault code and proceed
to A8
BIoc ked
Clear blockage and proceed to A8
OK
stop
Fault still present Proceed to A9
OK
stop
Fault still present Contact Jaguar Service Hotline
95
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
HEATED OXYGEN SENSORS- PO131 /PO151
NQ&:
Due to software configuration it is necessary to test both upstream sensors during fault diagnosis. Ensure that
sensors are re-connected correctly to avoid further engine management problems.
Symptom Chart
CONDITION
Fault code PO131 I
PO151
POSSIBLE SOURCE
H02S Low Voltage Fault (upstream
sensor)
ACTION
Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
pinpoint test A6
If fault not found, disconnect both upstream
sensors and proceed to pinpoint test A I
Pinpoint Tests
0
A6
A7
checks OK
Perform service drive cycle to verify fault
cleared
Return to Symptom Chart and repeat
diagnostic procedure
OK
Fault still present
OK
Fault still present
stop
Proceed to A7
stop
Contact Jaguar Service Hotline
0
0
96
Issue 2 June 1995
~~
X300 EDM
~
Symptom Chart
CONDITION
Fault code PO132 /
PO152
POSSIBLE SOURCE
H02S High Voltage Fault (upstream
sensor)
ACTION
Switch ignition off
Check harness and connector condition /
integrity, if faulty rectify and proceed to
pinpoint test A I 1
If fault not found, disconnect both upstream
sensors and proceed to pinpoint test A I
Pinpoint Tests
AI
Check harness continuity PI 128/002 to PI
105/006
1I
re-connect harness and proceed to
All
A2
Check harness continuity PI 128/001 to PI
105/008
OK
Open circuit
A3
Check harness continuity PI 129/002 to PI
105/019
OK
Open circuit
A4
Check harness continuity PI 129/001 to PI
105/008
OK
Open circuit
Proceed to A5
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
A5
Check harness insulation between signal
wires and Vbatt
OK
Short circuit
Proceed to A6
Locate and rectify wiring fault,
re-connect harness and proceed t o
AI1
A6
Check harness continuity PI 128/004 to
RS0061008
OK
Open circuit
Proceed to A7
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
A7
Check harness continuity PI 128/003 to PI
104/030
OK
Open circuit
Proceed t o A8
Locate and rectify wiring fault,
re-connect harness and proceed to
All
A8
Check harness continuity PI 129/004 to
RS0061008
OK
Open circuit
A9
Check harness continuity PI 129/003 to PI
104/030
OK
Open circuit
Renew and re-connect sensors if continuity
checks OK
Perform service drive cycle to verify fault
cleared
OK
A10
AI1
A12
X300 EDM
Return to Symptom Chart and repeat
diagnostic procedure
OK
Fault still present
OK
Fault still present
97
1
1
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to
All
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Proceed to A9
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
I Proceed to A10
1
Locate and rectify wiring fault,
re-connect harness and proceed to
All
Clear fault code and proceed to A I 1
stop
Proceed to A12
stop
Contact Jaguar Service Hotline
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
HEATED OXYGEN SENSORS - PO133 / PO153
Eh&:
Due to software configuration it is necessaryto test both upstream sensors during fault diagnosis. Ensure that
sensors are re-connected correctly to avoid further engine management problems.
0
Symptom Chart
CONDITION
Fault code PO133 /
PO153
POSSIBLE SOURCE
H02S Slow Response Fault (upstream
sensor)
ACTION
Switch ignition off
Check harness and connector condition /
integrity, if faulty rectify and proceed to
pinpoint test A6
If fault not found, disconnect both upstream
sensors and proceed to pinpoint test A I
Pinpoint Tests
TEST STEP
AI
RESULT
Check harness continuity PI 128/002 to PI
1051006
OK
Open circuit
A2
Check harness continuity PI 128/001 to PI
1051008
OK
Open circuit
A3
Check harness continuity PI 129/002 to PI
10510 19
OK
Open circuit
A4
Check harness continuity PI 129/001 to PI
105/008
OK
Open circuit
A5
Renew and reconnect sensors if continuity
checks OK
Perform service drive cycle to verify fault
cleared
OK
A6
A7
ACTION
1 Proceed to A2
I
Locate and rectify wiring fault,
reconnect harness and proceed to A6
Proceed to A3
Locate and rectify wiring fault,
reconnect harness and proceed to A6
Proceed to A4
Locate and rectify wiring fault,
reconnect harness and proceed to A6
0
Proceed to A5
Locate and rectify wiring fault,
reconnect harness and proceed to A6
Proceed to A6
Return to Symptom Chart and repeat
diagnostic procedure
0
Issue 2 June 1995
98
X300 EDM
rn
Fuel, Emission Control & Engine Management (AJ16)
HEATED OXYGEN SENSORS - P0137/ PO157
m: Due to software configuration it is necessary to test both downstream sensors during fault diagnosis. Ensure
that sensors are re-connected correctly to avoid further engine management problems.
Symptom Chart
CONDITION
Fault code PO137 I
PO157
POSSIBLE SOURCE
H02S Low Voltage Fault (downstream
sensor)
ACTION
Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
pinpoint test A6
If fault not found, disconnect both
downstream sensors and proceed to pinpoint
test A I
Pinpoint Tests
-
RE
I
ACTION
:su1.T
TES;T STEP
I Note: Do not attempt to test resistance between sensor pins 3 and 4 as the current generated by a
multimeter may damage the platinum electrodes
OK
Check harness continuity PI 1261002 to PI
1051016
Locate and rectify wiring fault,
Open circuit
re-connect harness and proceed to A6
Proceed to A3
Check harness continuity PI 1261001 to PI
OK
1051008
Locate and rectify wiring fault,
Open circuit
I
AI
A2
A3
Check harness continuity PI 1271002 to PI
1051018
OK
Open circuit
A4
Check harness continuity PI 1271001 to PI
1051008
OK
Open circuit
A5
Renew and re-connect sensors if continuity
checks OK
Perform service drive cycle to verify fault
cleared
OK
A6
A7
X300 EDM
Return to Symptom Chart and repeat
diagnostic procedure
re-connect harness and proceed to A6
Proceed to A5
Locate and rectify wiring fault,
re-connect harness and proceed to A6
Proceed to A6
stop
OK
Fault still present Proceed to A7
stop
OK
Fault still present Contact Jaguar Service Hotline
99
Issue 2 June 1995
I
I
I
II
II
II
I
I
Fuel, Emission Control & Engine Management (AJI6)
HEATED OXYGEN SENSORS - PO138 / PO158
U:Due to software configuration it is necessary to test both downstream sensors during fault diagnosis.
Ensure
that sensors are reconnected correctly to avoid further engine management problems.
Symptom Chart
CONDITION
Fault code PO138 1
POSSIBLE SOURCE
H02S High Voltage Fault (downstream
sensor)
PO 158
ACTION
Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
pinpoint test A I 1
If fault not found, disconnect both
downstream sensors and proceed to pinpoint
test A I
Pinpoint Tests
TEST STEP
I
ACTION
RESULT
n sensor pins 3 and 4 as the current generated by a
1
AI
A2
A3
A4
1051008
A5
wires and Vbatt
A6
A7
A8
A9
104l004
A10
AI1
cleared
AI2
Issue 2 June 1995
100
X300 EDM
Symptom Chart
CONDITION
Fault code PO139 /
PO159
POSSIBLE SOURCE
H02S Slow Response Fault
(downstream sensor)
Pinpoint Tests
I
\
Y-
Check harness continuity PI 126/002 to PI
105/016
Open circuit
Check harness continuity PI 126/001 to PI
105/008
OK
Open circuit
Check harness continuity PI 127/002 to PI
105/018
OK
Open circuit
Check harness continuity PI 127/001 to PI
105/008
OK
Open circuit
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
OK
Return to Symptom Chart and repeat
diagnostic procedure
Fault still present
X300 EDM
101
Proceed to A2
Locate and rectify wiring fault,
re-connect harness and proceed to A5
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to A5
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to A5
Fit new sensors, re-connect harness
and proceed to A5
Locate and rectify wiring fault,
re-connect harness and proceed to A5
stop
Proceed to A6
stop
Contact Jaguar Service Hotline
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
HEATED OXYGEN SENSORS - P 1 1 3 7 / P1157
&&e:
Due to software configuration it is necessary to test both downstream sensors during fault diagnosis. Ensure
that sensors are reconnected correctly to avoid further engine management problems.
Symptom Chart
CONDITION
Fault code PI 137 I
PI 157
AI
A2
A3
A4
A5
A6
A7
A8
POSSIBLE SOURCE
H02S Lack of Switching Indicates Lean
Fuelling (downstream)
AI1
Issue 2 June 1995
e
1
~
A10
I
ACTION
TEST STEP
RESULT
I
I
Note: Do not attempt to test resistance between sensor pins 3 and 4 as the current generated by a
multimeter may damage the platinum electrodes
Proceed to A2
Check sensors are connected to correct
OK
Plugs
Rectify and proceed to A10
Incorrect
Proceed to A3
OK
Check harness continuity PI 126/002 to PI
10510 16
Open circuit
Locate and rectify wiring fault,
reconnect harness and proceed to
A10
Proceed to A4
OK
Check harness continuity PI 126/001 to PI
105l008
Open circuit
Locate and rectify wiring fault,
reconnect harness and proceed to
A10
Proceed to A5
Check harness continuity PI 127/002 to PI
OK
105/018
Locate and rectify wiring fault,
Open circuit
reconnect harness and proceed to
A10
Proceed to A6
OK
Check harness continuity PI 127/001 to PI
105/008
Locate and rectify wiring fault,
Open circuit
reconnect harness and proceed to
A10
Proceed to A7
Check each downstream sensor heater
OK
resistance is within limits of 5.3 - 6.7R
Renew faulty element, re-connect
Out-of-range
harness and proceed to A10
Proceed to A8
Check harness continuity PI 126/003 to PI
OK
1271003
Locate and rectify wiring fault,
Open circuit
reconnect harness and proceed to
A10
Proceed to A9
Check harness continuity PI 126/003 PI
OK
105l004
Locate and rectify wiring fault,
Open circuit
reconnect harness and proceed to
A10
Fit new sensors, re-connect harness
OK
Check harness continuity PI 1261004 and PI
and proceed to A10
1271004 to RS 0061008
Locate and rectify wiring fault,
Open circuit
reconnect harness and proceed to
A10
stop
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present Proceed to A I 1
stop
Return to Symptom Chart and repeat
OK
diagnostic procedure
Fault still present Contact Jaguar Service Hotline
~~
A9
ACTION
Check for exhaust air leaks, rectify pipework if
faulty and proceed to pinpoint test A I 1
Switch ignition off
Check both downstream sensors are correctly
fitted, if faulty rectify and proceed to pinpoint
test A10
If fault not found, disconnect both
downstream sensors and proceed to pinpoint
test A I
102
X300 EDM
0
CONDITION
Fault code P I 138 /
PI158
POSSIBLE SOURCE
H02S Lack of Switching Indicates Rich
Fuelling (downstream)
ACTION
Switch ignition off and disconnect both
downstream sensors and proceed to pinpoint
test A I
Pinpoint Tests
AI
A2
A3
RESULT
ACTION
TEST STEP
I
I
Do not attempt to test resistance between sensor pins 3 and 4 as the current generated by a
Note:
multimeter may damage the platinum electrodes
OK
Proceed to A2
Test insulation PI 126/002 and P1127/002 to
ground
Short circuit
Locate and repair wiring fault and
proceed to A4
OK
I Proceed to A3
Check each downstream sensor heater
resistance is within limits of 5.3 - 6.7R
Renew heater element, re-connect
Incorrect
Check sensors are connected to correct
Plugs
OK
Incorrect
A4
A5
X300 EDM
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
OK
Return t o Symptom Chart and repeat
diagnostic procedure
Fault still Dresent
103
and proceed to A4
Rectify, re-connect harness and
proceed to A4
stop
Proceed to A5
stop
Contact Jaauar Service Hotline
Issue 2 June 1995
CONDITION
Fault code PO171 /
ACTION
Check for exhaust air leaks, rectify pipework if
faulty and proceed to pinpoint test A10
Check for misfire code recorded, if found
rectify and proceed to pinpoint test A10
Switch ignition off if fault not found and
proceed to pinpoint test A I
POSSIBLE SOURCE
System too Lean
OK
Open circuit
A2
Check harness continuity PI 126/001 to PI
105/008
OK
Open circuit
A3
Check harness continuity PI 127/002 t o PI
105/018
OK
Open circuit
A4
Check harness continuity PI 127/001 to PI
105/008
OK
Open circuit
Proceed to A5
Locate and rectify wiring fault,
reconnect harness and proceed to
A10
A5
Check harness continuity PI 128/002 to PI
105/006
OK
Open circuit
A6
Check harness continuity PI 128/001 PI
105/008
OK
Open circuit
A7
Check harness continuity PI 129/001 to PI
105/019
OK
Proceed to A6
Locate and rectify wiring fault,
reconnect harness and proceed t o
A10
Proceed t o A7
Locate and rectify wiring fault,
reconnect harness and proceed to
A I0
Reconnect sensors and proceed to
A8
Locate and rectify wiring fault,
reconnect harness and proceed to
A10
AI
RESULT
ACTION
TEST STEP
Check harness continuity PI 126/002 to PI
105/016
Open circuit
OK
Open circuit
A8
Check harness continuity PI 129?001to PI
105l008
A9
Clear
BIocked
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
Return to Symptom Chart and repeat
OK
diagnostic procedure
Fault still present
A10
AI1
Check injectors for blockages
Issue 2 June 1995
104
Proceed to A2
Locate and rectify wiring fault,
re-connect harness and proceed to
A10
Proceed t o A3
Locate and rectify wiring fault,
reconnect harness and proceed t o
A10
Proceed t o A4
Locate and rectify wiring fault,
reconnect harness and proceed to
A I0
Proceed t o A9
Locate and rectify wiring fault,
reconnect harness and proceed to
A10
Proceed to A10
Clear and proceed to A10
stop
Proceed to A I 1
stop
Contact Jaguar Service Hotline
X300 EDM
ADAPTIVE FUEL
- P0172/ PO175
Symptom Chart
7
Fault code PO172 /
PO175
I
Pinpoint Tests
AI
A2
0
A3
A4
A5
A6
A7
0
0
POSSIBLE SOURCE
System too Lean
ACTION
Check for exhaust air leaks, rectify pipework if
faulty and proceed to pinpoint test A6
Check for misfire code recorded, if found
rectify and proceed to pinpoint test A6
Switch ignition off if fault not found,
disconnect all H02S sensors and proceed to
pinDoint test A I
CONDITION
Fault code PI 171
POSSIBLE SOURCE
Lean Fuelling
ACTION
Check fuel tank is not empty, if necessary fill
tank and proceed t o pinpoint test A14
Check fuel pump is being driven, if faulty
rectify and proceed to pinpoint test A14
Remove fuel pump relay and harness
connector from fuel pump if fault not found
and proceed to pinpoint test A I
TEST STEP
Check harness continuity BT 0261085 to PI
10410 19
OK
Open circuit
A2
Check harness continuity BT 0261030 to BT
0351004
OK
Open circuit
A3
Check harness continuity BT 0261086 to CA
0441007
OK
Open circuit
Proceed to A4
Locate and rectify wiring fault,
reconnect harness and proceed to
A I4
A4
Check harness continuity BT 0261087 to BT
0061002
OK
Open circuit
Proceed to A5
Locate and rectify wiring fault,
reconnect harness and proceed to
A14
A5
Check harness continuity BT 0061001 to
ground
OK
Open circuit
Proceed to A6
Locate and rectify wiring fault,
reconnect harness and proceed to
A I4
A6
Check fuel pump relay operation
OK
Faulty
AI
A7
A8
A9
A10
AI1
A I2
A13
AI4
RESULT
ACTION
Proceed to A2
Locate and rectify wiring fault,
reconnect harness and proceed to
A14
Proceed to A3
Locate and rectify wiring fault,
reconnect harness and proceed to
A I4
Refit relay and proceed to A7
Repair or renew relay, re-connect
harness and proceed to A14
Check fuel filter for blockage
Proceed to A8
Clear
Blocked
Clear and proceed to A14
Check injectors for blockages
Clear
Proceed to A9
Blocked
Clear and proceed to A14
Check fuel pipe 1 rail for leaks 1 blockages
OK
Proceed to A I 0
Faulty
Rectify and proceed to A14
Check fuel rail pressure
OK
Proceed to A I 1
Too Low
Rectify and proceed t o A14
Check harness insulation injector pin
Proceed to A I 2
OK
harness connector to ground (for each
Full I partial short Locate and rectify wiring fault,
injector)
circuit
reconnect harness and proceed to
A I4
NO
Check if MAFS or H02S fault code is
Disconnect fuel pump from harness
recorded
and proceed to A13
Rectify fault and proceed to A14
Yes
Check voltage is approximately 1OV at BT
Proceed to A I 4
OK
0061002
Out-of-range
Rectify supply fault and proceed t o
A I4
Clear fault and perform service drive cycle to OK
stop
verify fault cleared
Fault still present I Proceed to A15
Issue 2 June 1995
I
106
X300 EDM
Fuel, Emission Control & Engine Management (AJl6)
TEST STEP
A15
X300 EDM
Return to Symptom Chart and repeat
diagnostic procedure
RESULT
ACTION
OK
stop
Fault still present Contact Jaguar Service Hotline
107
Issue 2 June 1995
TEST STEP
RESULT
OK
Incorrect
OK
Blocked
OK
Leaking
AI
Check fuel rail pressure
A2
Check for blockages in fuel return pipe
A3
Check regulator vacuum pipe for leakage
A4
Check injectors for leaks
OK
Leaking
A5
Check if MAFS or H02S fault code is
recorded
NO
A6
A7
I Yes
Clear fault and perform service drive cycle to I OK
verify fault cleared
Fault still present
OK
Return to Symptom Chart and repeat
diagnostic procedure
Fault still present
Issue 2 June 1995
I
108
ACTION
Proceed to A2
Rectify and proceed to A7
Proceed to A3
Clear and proceed to A7
Proceed to A4
Repair or renew pipe and proceed to
A7
I
Proceed to A5
Repair or renew injector, reconnect
harness and proceed to A7
Disconnect fuel pump from harness
and proceed t o A6
Rectify fault and proceed t o A7
1 stop
I Proceed t o A7
I
I stop
I Contact Jaguar Service Hotline
X300 EDM
Fuel, Emission Control & Engine Management (AJI6)
ADAPTIVE FUEL - PI 176
Symptom Chart
CONDITION
Fault code PI 176
POSSIBLE SOURCE
Lean Fuelling Trim, Long Term (MFR)
ACTION
Check fuel pump is being driven, if faulty
rectify and proceed to pinpoint test A12
Remove fuel pump relay and harness
connector from fuel pump if fault not found
and proceed to pinpoint test A I
Open circuit
A2
Check harness continuity BT 0261030 to BT
0351004
OK
Open circuit
A3
Check harness continuity BT 0261086 to CA
0441007
Open circuit
A4
Check harness continuity BT 0261087 to BT
0061002
OK
Open circuit
A5
Check harness continuity BT 0061001 to
ground
OK
AI
0
RESULT
TEST STEP
Check harness continuity BT 0261085 to PI
1041019
ACTION
Proceed to A2
Locate and rectify wiring fault,
re-connect harness and proceed to
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to
AI2
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to
AI2
Proceed to A5
Locate and rectify wiring fault,
re-connect harness and proceed to
AI2
Refit fuel pump relay and proceed to
A6
Locate and rectify wiring fault,
re-connect harness, refit fuel pump
relay and proceed t o A12
Open circuit
0
Proceed to A7
Clear and proceed to A12
Proceed to A8
Rectify and proceed to A12
Proceed to A9
Rectify and proceed to A12
Proceed to A10
Clear and proceed to A12
Proceed t o A I 1
Locate and rectify wiring fault,
re-connect harness and proceed to
A12
A6
Check fuel filter for blockage
A7
Check fuel pipe I rail for leaks I blockages
A8
Check fuel rail pressure
A9
Check injectors for blockages
A I0
Check harness insulation injector pin
harness connector to ground (for each
injector)
AI1
Disconnect fuel pump from harness
and proceed to A12
Rectify fault and proceed t o A12
Yes
Clear fault and perform service drive cycle to OK
j stop
verify fault cleared
Fault still present 1 Proceed to A13
OK
stop
Return to Symptom Chart and repeat
diagnostic procedure
Fault still present 1 Contact Jaguar Service Hotline
A12
A13
Check if MAFS or H02S fault code is
recorded
Clear
Blocked
OK
Faulty
OK
Too Low
Clear
Blocked
OK
Full I partial short
circuit
NO
1
0
X300 EDM
109
Issue 2 June 1995
CONDITION
Fault code P I 177
POSSIBLE SOURCE
Rich Fuelling Trim, Long Term (FMFR)
AI
TEST STEP
Check fuel rail pressure
A2
Check for blockages in fuel return pipe
RESULT
OK
Incorrect
OK
BIocked
OK
Leaking
A3
Check regulator vacuum pipe for leakage
A4
Check injectors for leaks
OK
Leaking
A5
Check if MAFS or H02S fault code is
recorded
NO
A6
A7
ACTION
Proceed to Pinpoint test A I
Yes
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
Return t o Symptom Chart and repeat
OK
diagnostic procedure
Fault still present
Issue 2 June 1995
110
Clear and proceed to A6
Proceed t o A4
Repair or renew pipe and proceed to
A6
Proceed to A5
Repair or renew injector, re-connect
harness and proceed to A6
Disconnect fuel pump from harness
and proceed to A6
Rectify fault and proceed to A6
stop
Proceed to A7
Stop
Contact Jaguar Service Hotline
X300 EDM
Fuel, Emission Control & Engine Management (AJI6)
ADAPTIVE FUEL - P1178, P1179
Symptom Chart
CONDITION
Fault code PI 178
POSSIBLE SOURCE
Rich Fuelling Trim, Long Term (AMFR)
ACTION
Check for manifold air leaks, rectify as
necessary
Check for recorded MAFS fault code, rectify
as necessary
Clear fault code and perform service drive
cycle to verify fault cleared
Contact Jaguar Service Hotline if fault still
present
CONDITION
Fault code PI 179
POSSIBLE SOURCE
Rich Fuelling Trim, Long Term (AMFR)
ACTION
Check for exhaust leaks, rectify as necessary
Check for recorded MAFS fault code, rectify
as necessary
Clear fault code and perform service drive
cycle to verify fault cleared
Contact Jaguar Service Hotline if fault still
present
0
X300 EDM
111
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
HEATED OXYGEN SENSORS - P1185
Note:
Due to software configuration it is necessaryto test both upstream sensors during fault diagnosis. Ensure that
sensors are re-connected correctly to avoid further engine management problems.
symptom Chart
CONDITION
Fault code P I 185
POSSIBLE SOURCE
I
I H02S Heater Open Circuit (upstream
sensor)
ACTION
Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
pinpoint test A7
If fault not found, disconnect both upstream
sensors and proceed to pinpoint test A I
I
Pinpoint Tests
AI
A2
TEST STEP
RESULT
ACTION
Note: Do not attempt to test resistance between sensor pins 3 and 4 as the current generated by a
multimeter may damage the platinum electrodes
Proceed to A2
OK
Check each upstream sensor heater
resistance is within limits of 5.3 - 6.7R
Renew sensor, reconnect harness
0ut-of-Iim its
and proceed to A7
Switch off ignition and proceed to A3
Check harness continuity PI 128/003 to PI
OK
1291003
Locate and rectify wiring fault,
Open circuit
A3
Check harness continuity PI 1281001 to PI
104/030
A4
Check harness continuity PI 128/004 to RS
0061008
OK
Open circuit
Check harness continuity PI 129/004 to RS
006/008
OK
Open circuit
reconnect harness and proceed to A7
A5
A6
Check harness insulation P1128/003 to
ground
1 Proceed to A5
I
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Reconnect harness and proceed to
OK
Short circuit
reconnect harness and proceed to A7
Clear fault and perform service drive cycle to OK
I stop
verify fault cleared
Fault still present I Proceed to A8
Return to Symptom Chart and repeat
OK
stop
diagnostic procedure
Fault still present I Contact Jaguar Service Hotline
I
A7
A8
Issue 2 June 1995
I
112
I
X300 EDM
Symptom Chart
CONDITION
Fault code P I 186
POSSIBLE SOURCE
I H02S Heater Short Circuit (upstream
I
sensor)
Pinpoint Tests
Check voltage is reading 0 PI 128/003 and PI
1291003 to Vbatt
OV
Above OV
Clear fault and perform service drive cycle to
verify fault cleared
Return to Symptom Chart and repeat
diagnostic procedure
X300 EDM
and proceed to A3
Renew sensors, re-connect harness
and proceed to A3
Locate and rectify wiring fault,
re-connect harness, reconnect
harness and proceed to A3
OK
stop
Fault still present Proceed to A4
OK
stop
Fault still present Contact Jaguar Service Hotline
113
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
HEATED OXYGEN SENSORS - P1187
Note:
Due to software configuration it is necessaryto test both upstream sensors during fault diagnosis. Ensure that
sensors are re-connected correctly to avoid further engine management problems.
Symptom Chart
CONDITION
Fault code PI 187
POSSIBLE SOURCE
H02S Heater Inferred Open Circuit
(upstream sensor)
ACTION
Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
pinpoint test A6
If fault not found, disconnect both upstream
sensors and proceed to pinpoint test A I
Pinpoint Tests
AI
A2
A3
TEST STEP
RESULT
ACTION
I
I
Note: Do not attempt to test resistance between sensor pins 3 and 4 as the current generated by a
multimeter may damage the platinum electrodes
OK
Proceed to A2
Check each upstream sensor heater
resistance is within limits of 5.3 - 6.7R
Renew sensor, reconnect harness
Out-of-Iimits
and proceed to A6
OK
I Proceed to A3
Check harness continuity PI 1261003 to PI
1271003
Locate and rectify wiring fault,
Open circuit
1
I
Check harness continuity PI 126/001 to PI
1041004
reconnect harness and proceed to A6
A4
Check harness continuity PI 126/004 to RS
0061008
OK
Open circuit
OK
006/008
Open circuit
I Proceed to A5
I
Locate and rectify wiring fault,
reconnect harness and proceed to A6
Renew sensors, re-connect harness
and proceed to A6
Locate and rectify wiring fault,
reconnect harness and proceed to A6
stop
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present Proceed to A7
OK
stop
Return to Symptom Chart and repeat
diagnostic procedure
Fault still present Contact Jaguar Service Hotline
Issue 2 June 1995
114
X300 EDM
Fuel, Emission Control & Engine Management (AJ16)
HEATED OXYGEN SENSORS - P1188
W: Due to software configuration it is necessary to test both upstream sensors during fault diagnosis. Ensure that
sensors are reconnected correctly to avoid further engine management problems.
Symptom Chart
CONDITION
POSSIBLE SOURCE
ACTION
Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
pinpoint test A7
If fault not found, disconnect both upstream
sensors and proceed to pinpoint test A I
sensor)
Pinpoint Tests
TEST STEP
AI
RESULT
multimeter may damage the platinum electrodes
Check each upstream sensor heater
OK
resistance is within limits of 5.3 - 6.7Q
Out-of4 imits
A2
Check harness continuity PI 128/003 to PI
1291003
OK
Open circuit
A3
Check harness continuity PI 128/003 to PI
104/030
OK
Open circuit
A4
Check harness continuity PI 128/004 t o RS
006/008
OK
Open circuit
A5
Check harness continuity PI 1291004 to RS
0061008
OK
Open circuit
A6
Check harness insulation PI 128/003 to
ground
OK
Short circuit
A7
A8
X300
EDM
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
Return to Symptom Chart and repeat
OK
diagnostic procedure
Fault still present
115
ACTION
Proceed to A2
Renew sensors, re-connect harness
and proceed to A7
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Proceed to A5
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Proceed to A6
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Renew sensors, re-connect harness
and proceed to A7
Locate and rectify wiring fault,
re-connect harness, reconnect
harness and proceed to A7
stop
Proceed to A8
stop
Contact Jaguar Service Hotline
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
0
CONDITION
Fault code P1189
POSSIBLE SOURCE
H02S Heater Circuit Low Resistance
(upstream sensor)
ACTION
Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
pinpoint test A7
If fault not found, disconnect both upstream
sensors and proceed to pinpoint test A I
A1
A2
A3
A4
A6
A7
A8
TEST STEP
RESULT
ACTION
I
I
Note: Do not attempt to test resistance between sensor pins 3 and 4 as the current generated by a
multimeter may damage
- the platinum electrodes
Check each upstream sensor heater
OK
Proceed to A2
resistance is within limits of 5.3 - 6.7R
Out-of-limits
Renew sensors, re-connect harness
and proceed to A7
Check harness continuity PI 1281003 to PI
OK
I Proceed to A3
1291003
Open circuit
Locate and rectify wiring fault,
reconnect harness and proceed to A7
Check harness continuity PI 1281003 to PI
Proceed to A4
OK
104l030
Open circuit
Locate and rectify wiring fault,
reconnect harness and proceed to A7
Check harness continuity PI 1281004 to RS
OK
I Proceed to A5
0061008
Open circuit
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Renew sensors, re-connect harness
Check harness continuity PI 1291004 to RS
OK
0061008
and proceed to A7
Open circuit
Locate and rectify wiring fault,
re-connect harness, reconnect
harness and proceed to A7
Clear fault and perform service drive cycle to OK
I Stop
verify fault cleared
Fault still present I Proceed to A8
Return to Symptom Chart and repeat
OK
stop
diagnostic procedure
Fault still present I Contact Jaguar Service Hotline
Issue 2 June 1995
I
116
I
I
I
I
X300 EDM
e
Symptom Chart
CONDITION
Fault code PI 190
POSSIBLE SOURCE
H02S Heater Circuit Low Resistance
(upstream sensor)
Pinpoint Tests
AI
A2
Check each upstream sensor heater
resistance is within limits of 5.3 - 6.7R
Check harness continuity PI 128/003 to PI
129/003
I and proceed to A7
OK
Open circuit
I Proceed to A3
1 Proceed to A5
A3
Check harness continuity PI 128/003 to PI
104/030
A4
Check harness continuity PI 128/004 to RS
006/008
OK
Open circuit
Check harness continuity PI 129/004 to RS
006/008
OK
Locate and rectify wiring fault,
re-connect harness and proceed to A7
A6
Short circuit
A7
A8
X300 EDM
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
Return to Symptom Chart and repeat
OK
diagnostic procedure
Fault still present
117
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Renew sensors, re-connect harness
and proceed to A7
Locate and rectify wiring fault,
re-connect harness, reconnect
harness and proceed to A7
I Stop
I Proceed to A8
I Stop
I Contact Jaguar Service Hotline
Issue 2 June 1995
I
A2
A3
A4
A5
A6
A7
A8
I
Note: Do not attempt to test resistance between sensor pins 3 and 4 as the current generated by a
multimeter may damage the platinum electrodes
Check each downstream sensor heater
Proceed to A2
OK
resistance is within limits of 5.3 - 6.7R
Out-of-l im its
Renew sensors, re-connect harness
and proceed to A7
Check harness continuity PI 126/003 to PI
OK
Proceed to A3
127/003
Open circuit
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Check harness continuity PI 126/003 tp PI
OK
Proceed to A4
104/004
Open circuit
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Proceed to A5
Locate and rectify wiring fault,
reconnect harness and proceed to A7
Check harness continuity PI 127/004 to RS
Proceed to A6
OK
006/008
Open circuit
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Check harness insulation PI 126/003 to
OK
Renew sensors, re-connect harness
ground
and proceed to A7
Short circuit
Locate and rectify wiring fault,
reconnect harness, reconnect
harness and proceed to A7
Clear fault and perform service drive cycle to OK
stop
verify fault cleared
Fault still present Proceed to A8
Return to Symptom Chart and repeat
stop
OK
diagnostic procedure
Fault still present Contact Jaguar Service Hotline
Check harness continuity PI 126/004 to RS
006/008
Issue 2 June 1995
OK
Open circuit
118
X300 EDM
Symptom Chart
POSSIBLE SOURCE
H02S Heater Short Circuit
(downstream sensor)
ACTION
Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
pinpoint test A3
If fault not found, disconnect both
downstream sensors and proceed to pinpoint
test A I
Pinpoint Tests
1
AI
A2
A3
A4
1
TEST STEP
RESULT
ACTION
Note: Do not attempt to test resistance between sensor pins 3 and 4 as the current generated by a
multimeter may damage the platinum electrodes
Check each downstream sensor heater
OK
Proceed to A2
resistance is within limits of 5.3 - 6.7R
Out-of-limits
Renew sensor, re-connect harness
and proceed to A3
Check voltage reading 0 PI 1261003 and PI
OV
Renew sensors, re-connect harness
1271003 to Vbatt
and proceed to A3
Above OV
Locate and rectify wiring fault,
re-connect harness, reconnect
harness and proceed to A3
Clear fault and perform service drive cycle to OK
stop
verify fault cleared
Fault still present Proceed to A4
OK
stop
Return to Symptom Chart and repeat
diagnostic procedure
Fault still present Contact Jaguar Service Hotline
’
Fuel, Emission Control & Engine Management (AJI6)
HEATED OXYG€N SENSORS - P1193
!We:
Due to software configuration it is necessary to test both downstream sensors during fault diagnosis. Ensure
that sensors are reconnected correctly to avoid further engine management problems.
Symptom Chart
CONDITION
Fault code PI 193
POSSIBLE SOURCE
I
I H02S Heater Open Circuit (downstream
sensor)
ACTION
Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
pinpoint test A7
If fault not found, disconnect both
downstream sensors and proceed to pinpoint
test A I
Pinpoint Tests
RESULT
TEST STEP
AI
A2
A3
A4
A5
Check each downstream sensor heater
resistance is within limits of 5.3 - 6.7R
ACTION
Proceed to A2
Renew sensor, reconnect harness
and proceed to A7
Check harness continuity PI 1261003 to PI
OK
Switch off ignition and proceed to A3
1271003
Locate and rectify wiring fault,
Open circuit
re-connect harness and proceed to A7
Check harness continuity PI 126/001 to PI
Proceed to A4
OK
1041004
Open circuit
Locate and rectify wiring fault,
reconnect harness and proceed to A7
Check harness continuity PI 126/004 to RS
OK
Proceed to A5
0061008
Locate and rectify wiring fault,
Open circuit
re-connect harness and proceed to A7
Proceed to A6
Check harness continuity PI 127/004 to RS
OK
0061008
Locate and rectify wiring fault,
Open circuit
reconnect harness and proceed to A7
Reconnect harness and proceed to
OK
A7
ground
Short circuit
Locate and rectify wiring fault,
reconnect harness and proceed to A7
stop
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present I Proceed to A8
OK
stop
Return to Symptom Chart and repeat
diagnostic procedure
Fault still present I Contact Jaguar Service Hotline
OK
Out-of-limits
I
I
Issue 2 June 1995
120
X300 EDM
HEATED OXYGEN SENSORS - P1194
m: Due to software configuration it is necessary to test both downstream sensors during fault diagnosis. Ensure
that sensors are re-connected correctly to avoid further engine management problems.
Symptom Chart
CONDITION
Fault code PI 194
POSSIBLE SOURCE
H02S Heater Resistance (downstream
sensor)
ACTION
Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
pinpoint test A7
If fault not found, disconnect both
downstream sensors and proceed to pinpoint
test A I
Pinpoint Tests
0
a
AI
Check each downstream sensor heater
resistance is within limits of 5.3 - 6.7R
A2
Check harness continuity PI 1261003 to PI
1271003
A3
Check harness continuity PI 126/003 tp PI
104/004
A4
Check harness continuity PI 1261004 to RS
006/008
A5
Check harness continuity PI 1271004 to RS
0061008
A6
Check harness insulation PI 126/003 to
ground
re-connect harness, reconnect
A7
Clear fault and perform service drive cycle to
verify fault cleared
A8
Return to Symptom Chart and repeat
diagnostic procedure
0
X300 EDM
121
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
HEATED O X Y G E N SENSORS - P1195
m: Due to software configuration it is necessary to test both downstream sensors during fault diagnosis. Ensure
that sensors are reconnected correctly to avoid further engine management problems.
Symptom Chart
CONDITION
Fault code PI 195
POSSIBLE SOURCE
H02S Heater Circuit Low Resistance
(downstream sensor)
ACTION
Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
pinpoint test A7
If fault not found, disconnect both
downstream sensors and proceed to pinpoint
test A I
Pinpoint Tests
AI
A2
A3
A4
A5
A6
A7
A8
TEST STEP
RESULT
ACTION
I
I
Note: Do not attempt to test resistance between sensor pins 3 and 4 as the current generated by a
multimeter may damage the platinum electrodes
Check each downstream sensor heater
Proceed to A2
OK
resistance is within limits of 5.3 - 6.7Q
Out-of-lim its
Renew sensor, reconnect harness
and proceed to A7
Check harness continuity PI 1261003 to PI
OK
Proceed to A3
1271003
Open circuit
Locate and rectify wiring fault,
reconnect harness and proceed to A7
Check harness continuity PI 126/003 to PI
OK
Proceed to A4
1041004
Open circuit
Locate and rectify wiring fault,
reconnect harness and proceed to A7
Check harness continuity PI 1261004 to RS
OK
Proceed to A5
0061008
Locate and rectify wiring fault,
Open circuit
re-connect harness and proceed to A7
Renew sensors, re-connect harness
Check harness continuity PI 1271004 to RS
OK
and proceed to A6
0061008
Locate and rectify wiring fault,
Short circuit
reconnect harness and proceed to A7
Reconnect harness and proceed to
Check harness insulation PI 1271004 to
OK
A7
ground
Short circuit
Locate and rectify wiring fault,
reconnect harness, reconnect
harness and proceed to A7
Clear fault and perform service drive cycle to OK
stop
verify fault cleared
Fault still present Proceed to A8
stop
Return to Symptom Chart and repeat
OK
diagnostic procedure
Fault still present Contact Jaguarservice Hotline
Issue 2 June 1995
122
X300 EDM
Fuel, Emission Control & Engine Management (AJ16)
HEATED OXYGEN SENSORS - PI 196
Note:
Due to software configuration it is necessary to test both downstream sensors during fault diagnosis. Ensure
that sensors are re-connected correctly to avoid further engine management problems.
Symptom Chart
POSSIBLE SOURCE
H02S Heater Circuit Low Resistance
(downstream sensor)
ACTION
Switch ignition off
Check harness and connector condition /
integrity, if faulty rectify and proceed to
pinpoint test A6
If fault not found, switch ignition on and
proceed to pinpoint test A I
Pinpoint Tests
0
F
RESULT
TEST STEP
Check each downstream sensor heater
resistance is within limits of 5.3 - 6.7Q
OK
Out-of-li m its
A2
Check harness continuity PI 126/003 to PI
127/003
OK
Open circuit
A3
Check harness continuity PI 126/003 to PI
104/004
OK
Open circuit
A4
Check harness continuity PI 126/004 to RS
006/008
OK
Open circuit
A5
Check harness continuity PI 127/004 to RS
006/008
OK
Open circuit
A6
o r
X300 EDM
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
OK
Return to Symptom Chart and repeat
diagnostic procedure
Fault still Dresent
123
ACTION
Proceed to A2
Renew sensor, re-connect harness
and proceed to A6
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to A6
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to A6
Proceed to A5
Locate and rectify wiring fault,
re-connect harness and proceed to A6
Renew sensors, re-connect harness
and proceed to A6
Locate and rectify wiring fault,
re-connect harness, reconnect
harness and proceed t o A6
stop
Proceed to A7
stop
Contact Jaauar Service Hotline
Issue 2 June 1995
INJECTORS- P0207, POZOZ, P0203, P0204, P0205, PO206
The following table details harness connector information for each of the six injectors and the corresponding GEMS
ECM connector. Reference to this table is necessary when using the diagnostic procedures below.
Symptom Chart
CONDITION
Fault code PO201 -
POSSIBLE SOURCE
ACTION
Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
pinpoint test A7
If fault not found, disconnect suspect injector
and Droceed to Dinpoint test A I
Injector Circuit, Cylinder 1 - 6
Pinpoint Tests
RESULT
ACTION
TEST STEP
Check suspect injector resistance is within
limits of 15.55 - 16.25Q
OK
Out-of-Iimits
Proceed to A2
Renew injector, re-connect harness
and proceed to A7
A2
Check harness continuity injector pin 1
connector to PI 119/005
OK
Open circuit
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to A7
A3
Check harness continuity injector pin 2
connector to GEMS ECM
OK
Open circuit
Proceed to A4
Locate and rectify wiring fault,
reconnect harness and proceed to A7
A4
Check harness insulation injector pin 2
connector to ground
OK
Short circuit
A5
Check voltage reading 0 injector pin 2
connector to Vbatt
ov
Proceed to A5
Locate and rectify wiring fault,
reconnect harness and proceed to A7
Disconnect and remove EMS control
relay, re-connect injector under test
and proceed to A6
Locate and rectify wiring fault,
re-connect harness, reconnect
harness and proceed to A7
Reconnect EMS relay and harness
and proceed to A7
Locate and rectify wiring fault,
re-connect harness, reconnect EMS
relay and harness and proceed to A7
AI
Above OV
A6
A7
A8
Disconnect PI 104 multi-plug from GEMS
ECM, switch ignition ON and connect a
multi-meter (on voltage scale) between
ground (-ve probe) and ECM injector
connection
OV
Clear fault and perform service drive cycle to
verify fault cleared
Return to Symptom Chart and repeat
diagnostic procedure
OK
stop
Fault still Dresent Proceed to A8
OK
stop
Fault still present Contact Jaguar Service Hotline
Issue 2 June 1995
Vbatt
124
X300 EDM
I
I
1 and Droceed to DinDoint test A I
Pinpoint Tests
RESULT
TEST STEP
Check suspect injector resistance is within
limits of 15.55 - 16.25Q
OK
Out-of-lim its
A2
Check harness continuity injector pin 1
connector to PI 119/005
OK
Open circuit
A3
Check harness continuity injector pin 2
connector to GEMS ECM
OK
Open circuit
A4
Check harness insulation injector pin 2
connector to ground
OK
Short circuit
A5
Check voltage reading 0 injector pin 2
connector to Vbatt
ov
AI
Above OV
A6
A7
A8
X300 EDM
Disconnect PI 104 multi-plug from GEMS
ECM, switch ignition ON and connect a
multi-meter (on voltage scale) between
ground (-ve probe) and ECM injector
connection
ov
Vbatt
ACTION
Proceed to A2
Renew injector, re-connect harness
and proceed to A7
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Proceed to A5
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Disconnect and remove EMS control
relay, re-connect injector under test
and proceed to A6
Locate and rectify wiring fault,
re-connect harness, reconnect
harness and proceed to A7
Re-connect EMS relay and harness
and proceed to A7
Locate and rectify wiring fault,
re-connect harness, reconnect EMS
relay and harness and proceed to A7
Clear fault and perform service drive cycle to OK
stop
verify fault cleared
Fault still present Proceed to A8
Return to Symptom Chart and repeat
OK
stop
diagnostic procedure
Fault still present Contact Jaguar Service Hotline
125
Issue 2 June 1995
I
CONDITION
Fault code PO300
ACTION
Proceed to pinpoint test A I
POSSIBLE SOURCE
Random Misfire Detected
ACTION
Proceed t o A2
Rectify and proceed to A4
Proceed to A3
Check for EGR Fault Code recorded
Locate and rectify EGR fault and
proceed to A4
Proceed to A4
Check for fuel contamination
Clean
Rectify fault and proceed to A4
Contaminated
Clear fault and perform service drive cycle to OK
stop
verify fault cleared
Fault still present Proceed t o A5
OK
stop
Return to Symptom Chart and repeat
diagnostic procedure
Fault still present Contact Jaguar Service Hotline
TEST STEP
Check fuel pressure
Issue 2 June 1995
RESULT
I
OK
Low
No
Yes
126
X300 EDM
MISFIRE - P0301, P0302, P0303, P0304, P0305, PO306
The following table details harness connector information for each of the six injectors, ignition coils and the corresponding GEMS ECM connector. Reference to this table is necessary when using the diagnostic procedures below.
Symptom Chart
CONDITION
Fault code PO301 PO306
POSSIBLE SOURCE
Misfire Detected, Cylinder 1 - 6
ACTION
Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
test A7
.pinpoint
.
I
I
If fault not found, disconnect suspect iniector
and coil and proceed to pinpoint test A I
I
Pinpoint Tests
RESULT
ACTION
TEST STEP
Check harness continuity injector pin 1
connector to PI 119/005
OK
Open circuit
Proceed to A2
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
A2
Check harness continuity injector pin 2
connector to GEMS ECM
OK
Open circuit
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to
A1 1
A3
Check harness insulation injector pin 2
connector to ground
OK
Short circuit
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
A4
Check harness insulation injector pin 1
connector to ground
OK
Short circuit
A5
Check harness insulation coil pin 1
connector to ground
OK
Short circuit
A6
Check harness insulation coil pin 2
connector to ground
OK
Short circuit
A7
Check spark plugs
A8
Check injectors
A9
Check suspect ignition coil
OK
Faulty
OK
Faulty
OK
Faulty
Proceed to A5
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Proceed to A6
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Proceed to A7
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Proceed to A8
Rectify and proceed to A I 1
Proceed to A9
Rectify and proceed t o A I 1
Proceed t o A10
Rectify and proceed to A I 1
AI
X300 EDM
127
Issue 2 June 1995
I
Fuel, Emission Control & Engine Management (AJ16)
Pinpoint Tests continued - P0301, P0302, P0303, P0304, P0305, PO306
/o
Reconnect injector, coil and harness
and proceed to A I 1
connector and coil pin 1 connector to Vbatt
Locate and rectify wiring fault,
re-connect harness, re-connect
injector, coil and harness and proceed
to A I 1
stop
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present Proceed to A12
stop
OK
Return to Symptom Chart and repeat
diagnostic procedure
Fault still present Contact Jaguar Service Hotline
Issue 2 June 1995
128
X300 EDM
a
0
Pinpoint Tests
AI
TEST STEP
Check harness continuity from each injector
pin 1 connector to PI 119/005
1
RESULT
OK
Open circuit
Check harness continuity from each injector
pin 2 connector to GEMS ECM connection
OK
A3
Check harness continuity from each coil pin
1 connector to GEMS ECM connection
OK
Open circuit
A4
Check harness continuity from each coil pin
1 connector to RS 001/010
OK
Open circuit
A5
Check harness insulation from each injector
pin 1 connector to ground
OK
Short circuit
A6
Check harness insulation from each injector
pin 2 connector to ground
OK
Short circuit
A7
Check harness insulation from each coil pin
1 connector to ground
OK
Short circuit
A2
0
opencircuit
ACTION
Proceed to A2
Locate and rectify wiring fault,
re-connect harness and proceed to
A I3
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to
A I3
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to
A13
Proceed to A5
Locate and rectify wiring fault,
reconnect harness and proceed to
AI3
Proceed to A6
Locate and rectify wiring fault,
re-connect harness and proceed to
AI3
Proceed to A7
Locate and rectify wiring fault,
re-connect harness and proceed to
AI3
Proceed to A8
Locate and rectify wiring fault,
re-connect harness and proceed to
A13
a
X300 EDM
129
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
Tests continued- P 1 3 1 3 / P 1 3 1 4
A8
A9
A10
AI1
A I2
A I3
A I4
Proceed to A9
Locate and rectify wiring fault,
reconnect harness and proceed to
A13
Proceed t o A I 0
Measure voltage between each injector pin 2 ov
connector and PI 119/005
Locate and rectify wiring fault and
Vbatt
proceed t o A I 3
Re-connect harness and proceed to
ov
Measure voltage between each coil pin 1
AI1
connector and PI 119/005
Locate and rectify wiring fault,
Vbatt
re-connect harness and proceed to
A13
Proceed to A12
OK
Check fuel pump pressure is between 3 - 4
bar (absolute) and changes with engine load Out-of limit
Rectify and proceed to A13
Proceed to A13
OK
Check for crankshaft position sensor fault
code recorded
Rectify and proceed to A13
Faulty
stop
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present Proceed to A14
stop
OK
Return to Symptom Chart and repeat
diagnostic procedure
Fault still Dresent Contact Jaauar Service Hotline
Check harness insulation coil from each pin
2 to ground
Issue 2 June 1995
OK
Short circuit
130
X300 EDM
MISFIRE- P1315
Symptom Chart
CONDITION
Fault code PI315
ACTION
Check for fault code PO301 - PO306 already
recorded and rectify as necessary
Clear code and perform service drive cycle
to verify fault cleared
If fault is still present contact Jaguar Service
Hotline
POSSIBLE SOURCE
'ersistent Misfire
MISFIRE - P1376
Fault Code
Injector/
Coil No.
P1316
t
Injector Harness Connections
Ignition Coil Connections
Pin 2
GEMS ECM
P
Pin
i
2 n
GEMSECM
1
Pin1
1
2
3
4
5
PI 120/001
PI 121/001
PI 122/001
PI 123/001
PI 124/001
6
I PI 125/001
,
PI 120/002
PI 121/002
PI 122/002
PI 123/002
PI 124/002
1 PI 125/002
PI 104/002
PI 104/015
PI 104/014
PI 104/013
PI 104/027
PI 131/001
PI 132/001
PI 133/001
PI 134/001
PI 135/001
PI 131/001
PI 132/002
PI 133/002
PI 134/002
PI 135/002
PI 104/010
PI 104/008
PI 104/006
PI 104/005
PI 104/009
1 PI 104/025 I PI 136/001 1 PI 136/002 I PI 104/011
Symptom Chart
CONDITION
Fault code PI316
POSSIBLE SOURCE
Misfire Rate Above Limit
ACTION
Switch ignition off
Disconnect injector and coil harness
multi-plugs and proceed to pinpoint test A I
Pinpoint Tests
AI
0
TEST STEP
Check harness continuity from each injector
pin 1 connector to PI 119/005
RESULT
OK
Open circuit
Check harness continuity from each injector
pin 2 connector to GEMS ECM connection
OK
A3
Check harness continuity from each coil pin
1 connector to GEMS ECM connection
OK
Open circuit
A4
Check harness continuity from each coil pin
1 connector to RS 001/010
OK
Open circuit
A5
Check harness insulation from each injector
pin 1 connector to ground
OK
Short circuit
A2
opencircuit
ACTION
Proceed t o A2
Locate and rectify wiring fault,
re-connect harness and proceed to
A I4
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed t o
A I4
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to
A I4
Proceed to A5
Locate and rectify wiring fault,
re-connect harness and proceed to
A I4
Proceed to A6
Locate and rectify wiring fault,
re-connect harness and proceed to
AI4
0
X300 EDM
131
Issue 2 June 1995
--
Fuel, Emission Control & Engine Management
-
Pinpoint Tests continuedcontinued - P1315/ P1316
A6
A7
connector to groun
A8
2 to ground
A9
A10
easure vo
connector an
AI1
Check spark plugs
A I2
A I3
A I4
A I5
Impure
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
OK
Return t o Symptom Chart and repeat
diagnostic procedure
Fault still present
Issue 2 June 1995
132
Rectify and proceed t o A I 4
stop
Proceed to A15
stop
Contact Jaguar Service Hotline
X300 EDM
KNOCK SENSORS - PO326 / PO331
Symptom Chart
CONDITION
Fault code PO326
Fault code PO331
Bank A
Bank B
POSSIBLE SOURCE
Circuit Range / Performance Fault
ACTION
Proceed to pinpoint test A I
Pinpoint Tests
AI
A2
A3
A4
cylinder deposits
A5
A6
A7
X300 EDM
~
133
Issue 2 June 1995
Fault Code
Knock Sensor
Bank
PO327
PO332
A
B
CONDITION
Fault code PO327
Fault code PO332
Sensor Pin 1
PI 108/001
PI 109/001
Bank A
Bank B
Knock Sensor Connections
Signal
Ground
GEMS ECM
Sensor Pin 2
GEMS ECM
PI 105/021
PI 108/002
PI 105/009
PI 105/032
PI 109/002
PI 105/009
POSSIBLE SOURCE
Circuit Low Input
ACTION
Check suspect sensor is securely mounted, if
faulty rectify and proceed to pinpoint test A3
If fault not found disconnect suspect sensor
proceed to pinpoint test A I
0
Pinpoint Tests
AI
A2
TEST STEP
Check harness continuity sensor pin 1 to
GEMS ECM connection
Check harness continuity sensor pin 2 to
GEMS ECM connection
RESULT
OK
Open circuit
OK
Open circuit
A3
A4
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
Return to Symptom Chart and repeat
OK
diagnostic procedure
Fault still present
ACTION
Proceed to A2
Locate and rectify wiring fault,
reconnect harness and proceed to A3
Fit new sensor, re-connect harness
and proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed t o A3
stop
Proceed to A4
stop
Contact Jaguar Service Hotline
I
1
0
Issue 2 June 1995
134
X300 EDM
Fuel, Emission Control & Engine Management (AJ16)
K N O C K SENSORS - PO328 / PO333
Symptom Chart
CONDITION
Fault code PO328
Fault code PO333
Bank A
Bank B
POSSIBLE SOURCE
Circuit High Input Fault
ACTION
Check harness and connector condition I
integrity, if faulty rectify and proceed to
pinpoint test A3
If fault not found renew suspect sensor, clear
fault code and perform service drive cycle to
verify fault cleared
If fault still present contact Jaguar Service
Hotline
Pinpoint Tests
TEST STEP
Check harness continuity sensor pin 1 to
GEMS ECM connection
RESULT
OK
Open circuit
Check harness continuity sensor pin 2 to
GEMS ECM connection
OK
ill
'p
pi3
pi4
Open circuit
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
Return to Symptom Chart and repeat
OK
diagnostic procedure
Fault still present
ACTION
Proceed to A2
Locate and rectify wiring fault,
re-connect harness and proceed to A3
Fit new sensor, re-connect harness
and proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to A3
I Stop
I Proceed t o A4
I
I
I stop
I Contact Jaguar Service Hotline
~
X300 EDM
135
Issue 2 June 1995
TEST STEP
RESULT
ACTION
AI
A2
1041025
A3
A4
A5
A6
Issue 2 June 1995
136
X300 EDM
CRANKSHAFT POSITION SENSOR - PO336
symptom Chart
CONDITION
Fault code PO336
POSSIBLE SOURCE
CKP Range / Performance Fault
ACTION
Proceed to pinpoint test AI
Pinpoint Tests
X300 EDM
137
Issue 2 June 1995
CONDITION
Fault code PO340
POSSIBLE SOURCE
CMP Circuit Fault
ACTION
Proceed to pinpoint test A I
TEST STEP
RESULT
Check harness and connectors for condition I OK
integrity
Faulty
ACTION
Proceed to A2
Repair or renew CMP, re-connect
harness and proceed to A4
OK
Proceed to A3
Check CMP alignment
Adjust
or renew, re-connect harness
MisaIigned
and proceed to A4
Renew CMP, re-connect harness and
Check for CMP tooth damage
OK
proceed to A4
Faulty
Repair or renew, re-connect harness
and proceed to A4
Clear fault and perform service drive cycle to OK
stop
verify fault cleared
Fault still present Proceed to A5
OK
stop
Return to Symptom Chart and repeat
diagnostic procedure
Fault still present Contact Jaguar Service Hotline
Issue 2 June 1995
138
X300 EDM
IGNITION COILS- P1361, P1362, P1363, P1364, P1365, P1366
The following table details harness connector information for each of the six ignition coils and the corresponding
GEMS ECM connector. Reference to this table is necessary when using the diagnostic procedures below.
Symptom Chart
CONDITION
Fault code PI361 PI366
POSSIBLE SOURCE
No Activation, Cylinder 1 - 6
ACTION
Switch ignition off
Check harness and connector condition /
integrity, if faulty rectify and proceed to
pinpoint
test A7
. .
I If fault not found, disconnect suspect ignition
I coil and proceed.to pinpoint test AI
-
Pinpoint Tests
re-connect harness an
connector to
connector to ground
connector to ground
A6
A7
X300 EDM
stop
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present Proceed to A7
OK
stop
Return to Symptom Chart and repeat
diagnostic procedure
Fault still present Contact Jaguar Service Hotline
139
Issue 2 June 1995
,
I
CONDITION
Fault code P1371 P1376
POSSIBLE SOURCE
Early Activation, Cylinder 1 - 6
ACTION
Switch ignition off
Check harness and connector condition /
integrity, if faulty rectify and proceed to
pinpoint test A7
If fault not found, disconnect suspect ignition
coil and proceed to pinpoint test A1
Pinpoint Tests
A1
A2
A3
A4
A5
A6
A7
ACTION
Proceed
to
A2
OK
Renew coil, re-connect harness and
Incorrect
proceed to A6
Proceed to A3
Check harness continuity coil pin 1
connector to GEMS ECM
Locate and rectify wiring fault,
Open circuit
reconnect harness and proceed to A6
Disconnect harness plug PI 104 and
Check harness continuity coil pin 2
proceed to A4
connector to RS 001/010
Locate and rectify wiring fault,
Open circuit
re-connect harness and proceed to A6
Proceed to A5
OK
Check harness insulation coil pin 1
Locate and rectify wiring fault,
connector to ground
Short circuit
reconnect harness and proceed to A6
Proceed to A6
OK
Check harness insulation coil pin 2
Locate and rectify wiring fault,
connector to ground
Short circuit
reconnect harness and proceed to A6
stop
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present Proceed to A7
stop
Return to Symptom Chart and repeat
OK
diagnostic procedure
Fault still present Contact Jaguar Service Hotline
TEST STEP
Check ignition coil resistance is 0.75R
Issue 2 June 1995
RESULT
140
I
1
X300 EDM
0
EXHAUST GAS RECIRCULATION - PO400
symptom Chart
CONDITION
Fault code PO400
POSSIBLE SOURCE
EGR Flow or Function Sensor - Open
Circuit FauIt
ACTION
Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
pinpoint test A7
Ensure EGR sensor is securely fitted
If fault not found, disconnect EGR sensor and
proceed to pinpoint test A I
Pinpoint Tests
AI
0
A2
A3
TEST STEP
Check sensor voltage I engine temp in
accordance with curve shown on P64
RESULT
OK
Out-of-range
Check harness continuity PI 1101001 to PI
1051003
OK
Open circuit
Check harness continuity PI 110/002 to PI
1051030
OK
Open circuit
A4
Check for gas leak or blockage
OK
Faulty
A5
Check for IAT, TP or MAFS fault codes
recorded
Clear fault and perform service drive cycle to
verify fault cleared
Return to Symptom Chart and repeat
diagnostic procedure
OK
Faulty
OK
Fault still present
OK
Fault still present
A6
A7
ACTION
Proceed to A2
Renew sensor, re-connect harness
and Droceed to A6
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to A6
Disconnect harness plug PI 104 and
proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to A6
Proceed to A5
Locate and rectify pipework fault and
proceed to A6
Proceed to A6
Rectify and proceed to A6
stop
Proceed to A7
stop
Contact Jaguar Service Hotline
0
0
X300 EDM
141
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
EXHAUST GAS RECIRCULATION - P1400
symptom Chart
CONDITION
Fault code PI400
POSSIBLE SOURCE
EGR Valve - Position Control Fault
ACTION
I Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
pinpoint test A9
If fault not found, disconnect EGR valve and
proceed to Dinpoint test A I
Pinpoint Tests
TEST STEP
RESULT
ACTION
A1
A2
A3
A4
1171002
A5
1171004
A6
A7
A8
A9
A10
OK
Proceed to A8
Repair or renew and proceed to A9
Faulty
Proceed to A9
OK
Check for IAT, TP or MAFS fault codes
recorded
Faulty
Rectify and proceed to A9
Clear fault and perform service drive cycle to OK
stop
verify fault cleared
Fault still present Proceed to A10
OK
stop
Return to Symptom Chart and repeat
diagnostic procedure
Fault still present Contact Jaguar Service Hotline
Check for valve blockage or seizure
Issue 2 June 1995
142
X300 EDM
Fuel, Emission Control & Engine Management (AJI6)
EXHAUST GAS RECIRCULATION - P1401
Symptom Chart
CONDITION
Fault code PI401
I
POSSIBLE SOURCE
EGR Valve - Position Circuit Fault
I
1
I
ACTION
Switch ignition off
Check harness and connector condition /
integrity, if faulty rectify and proceed to
pinpoint test A9
If fault not found, disconnect EGR valve and
proceed to pinpoint test A I
1
I
Pinpoint Tests
TEST STEP
AI
RESULT
OK
Open circuit
Check harness continuity PI 117/004 to PI
105/011
A3
Check harness continuity PI 117/003 to PI
105/015
Check harness continuity PI 117/002 to PI
1u5/uuI
I
OK
Open circuit
Proceed to A3
OK
Open circuit
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to A9
Proceed to A5
Locate and rectify wiring fault,
re-connect harness and proceed to A9
Proceed to A6
A4
Check voltage reading 0 PI 117/002 to Vbatt
OV
Above OV
A5
Check harness insulation PI 117/003 to PI
119/005
OK
Full or partial
short circuit
A6
A7
A8
A9
A10
X300 EDM
Locate and rectify wiring fault,
I re-connect harness and proceed to A9
I
A2
ACTION
Proceed to A2
OK
Full or Dartial
short c/rcuit
OK
Check harness insulation PI 117/004 to PI
--- ,- - I
11Y/UU5
Full or partial
short circuit
Check for valve blockage or seizure
OK
Faulty
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
OK
Return to Symptom Chart and repeat
diagnostic procedure
Fault still present
Locate and rectify wiring fault,
re-connect harness and proceed to A9
Locate and rectify wiring fault,
re-connect harness and proceed to A9
Proceed to A7
Check harness insulation PI 117/003 to PI
119/005
143
Locate and rectify wiring fault,
re-connect harness and-proceed to A9
I
Proceed to A8
Locate and rectify wiring fault,
re-connect harness and proceed to A9
Proceed to A9
Repair or renew and proceed to A9
stop
Proceed to A10
stop
Contact Jaguar Service Hotline
Issue 2 June 1995
I
Fuel, Emission Control & Engine Management (AJ16)
CONDITION
Fault code PI408
POSSIBLE SOURCE
EGR Flow or Function Sensor Fault
L
I
IA2
A4
A5
Switch ignition off
Check harness and connector condition /
integrity, if faulty rectify and proceed to
pinpoint test A4
If fault not found, disconnect EGR sensor and
proceed to pinpoint test A I
OK
Full or partial
short circuit
OK
Check harness insulation PI 110/001 to
ground
Full or partial
short circuit
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
OK
Return to Symptom Chart and repeat
diagnostic procedure
Fault still Dresent
Check harness insulation PI 110/002 to PI
119/005
IA3
ACTION
Issue 2 June 1995
144
Proceed to A3
Locate and rectify wiring fault,
reconnect harness and proceed to A4
Renew valve and proceed to A4
Locate and rectify pipework fault and
proceed to A4
stop
Proceed to A5
stop
Contact Jaauar Service Hotline
X300 EDM
Fuel, Emission Control &
0
EXHAUST GAS RECIRCULATION - P7409
Symptom Chart
CONDITION
Fault code PI409
POSSIBLE SOURCE
EGR Valve Circuit Fault
Switch ignition off
Check harness and connector condition I
integrity, if faulty rectify and proceed to
DinDoint test A4
I
I
I
I re-connect harness and proceed to A4 I
I Proceed to A4
I
I Renew valve and proceed to A4
I
I
I Proceed to A5
I
I
1Contact Jaguar Service Hotline
I
I
proceed to pinpoint test A I
Pinpoint Tests
AI
TEST STEP
Check harness continuity PI 117/001 to PI
104/035
OK
Open circuit
A2
Check harness continuity PI 1171005 t o PI
1191005
A3
Check EGR solenoid resistance is within
limits of 7.8 - 8.6R
A4
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
Return to Symptom Chart and repeat
OK
diagnostic procedure
ault still present
A5
X300 EDM
OK
Out-of-limits
145
I Proceed to A2
Locate and rectify wiring fault,
re-connect harness and proceed to A4
Issue 2 June 1995
I
I
I
I
I
I
Fuel, Emission Control & Engine Management (AJl6)
SECONDARY AIR INjECTlON SYSTEM - PO41 7
Symptom Chart
CONDITION
Fault code PO411
POSSIBLE SOURCE
Insufficient Air Flow
ACTION
Switch ignition off
Check pump and relay harness and connector
condition / integrity, if faulty rectify and
faulty rectify and proceed to pinpoint test A9
If fault not found, disconnect AIR harness and
relay and proceed to pinpoint test A I
Pinpoint Tests
TEST STEP
RESULT
ACTION
AI
1461003
A2
115/001
A3
A4
A5
1461002
A6
104l007
A7
Check AIR relay or>eration
I OK
Faulty
A8
Check AIR pump is permanently off
No
I Proceed to A8
I
Renew relay, reconnect harness and
proceed to A9
Proceed to A9
Yes
A9
A10
Renew pump, reconnect harness and
proceed to A9
Clear fault and perform service drive cycle to OK
stop
verify fault cleared
Fault still present Proceed to A10
OK
stop
Return to Symptom Chart and repeat
diagnostic procedure
Fault still present Contact Jaguar Service Hotline
Issue 2 June 1995
146
X300 EDM
0
SECONDARY AIR INJECTION SYSTEM - PO413
symptom Chart
CONDITION
Fault code PO413
POSSIBLE SOURCE
Air Switching Valve - Open Circuit
Pinpoint Tests
AI
0
A2
061l013
Open circuit
Check harness continuity PI 0611013 t o PI
1461003
OK
Open circuit
A4
Check harness continuity PI 1461005 to PI
115/001
OK
Open circuit
A5
Check harness continuity PI I461005 t o PI
1 151002
OK
Open circuit
A6
Check harness continuity PI 1151003 to PI
1041007
OK
A3
Open circuit
0
a7
Clear fault and perform service drive cycle to
verify fault cleared
A8
Return to Symptom Chart and repeat
diagnostic procedure
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Proceed to A5
Locate and rectify wiring fault,
reconnect harness and proceed to A7
Proceed to A6
Locate and rectify wiring fault,
re-connect harness and proceed to A7
Fit new AIR relay, re-connect harness
and proceed to A7
Locate and rectify wiring fault,
re-connect harness and proceed to A7
0
X300 EDM
147
Issue 2 June 1995
CONDITION
Fault code PO414
ACTION
Switch ignition off
If fault not found, disconnect AIR relay and
proceed to pinpoint test A I
POSSIBLE SOURCE
Air Switching Valve - Short Circuit
OK
Short circuit
A2
Check harness insulation PI 146/002 to
ground
OK
Short circuit
A3
Check harness insulation PI 146/003 to
ground
OK
Short circuit
A4
Check harness insulation PI 146/005 to
ground
OK
Short circuit
A5
Check voltage PI 146/001 to Vbatt
ov
AI
ACTION
RESULT
TEST STEP
Check harness insulation PI 146/001to
ground
Above OV
A6
Check voltage PI 146/005 to Vbatt
ov
Above OV
A7
A8
1
Proceed to A2
Locate and rectify wiring fault,
reconnect harness and proceed to A7
Proceed to A3
Locate and rectify wiring fault,
reconnect harness and proceed to A7
Proceed to A4
Locate and rectify wiring fault,
reconnect harness and proceed to A7
Proceed to A5
Locate and rectify wiring fault,
reconnect harness and proceed to A7
Fit new AIR relay, re-connect harness
and proceed to A6
Locate and rectify wiring fault,
reconnect harness and proceed to A7
Renew AIR relay, reconnect harness
and proceed to A7
Locate and rectify wiring fault,
re-connect harness and proceed to A7
stop
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present I Proceed to A8
OK
stop
Return to Symptom Chart and repeat
diagnostic procedure
Fault still present I Contact Jaguar Service Hotline
Issue 2 June 1995
I
148
X300 EDM
Pinpoint Tests
AI
TEST STEP
Check harness continuity PI 128/001 to PI
105/008
RESULT
Open circuit
re-connect harness and proceed to
AI1
A2
A3
Check harness continuity PI 128/002 to PI
105/006
Open circuit
Check harness insulation PI 129/00
105/008
Short circuit
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
I
A4
Check harness insulation PI 129/002 to PI
105/019
A5
Check harness insulation PI 128/002 to
ground
ov
Full or partial
short circuit
A6
OV
Check harness insulation PI 129/002 to
ground
Full or partial
short circuit
A7
Check harness insulation PI 128/00
006/008
Short circuit
A8
Check harness insulation PI 128/002 to RS
006/008
OK
Short circuit
A9
Check harness insulation PI 129/001 to
006/008
RS
OK
Short circuit
X300 EDM
149
Proceed to A5
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Fit new AIR relay, re-connect harness
and proceed to A6
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Renew AIR relay, re-connect harness
and proceed to A7
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Proceed to A8
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Proceed to A9
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Proceed to A10
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
Pinpoint Tests continued - PO420
Check harness continuity PI 129/002 to RS
OK
006/008
Fit new upstream H02S sensors and
catalyst, reconnect harness and
proceed t o A I 1
Locate and rectify wiring fault,
re-connect harness and proceed to
A I1
Clear fault and perform service drive cycle to OK
stop
verify fault cleared
Fault still present Proceed to A I 2
stop
Return t o Symptom Chart and repeat
OK
diagnostic procedure
Fault still present Contact Jaguar Service Hotline
Short circuit
A12
I
issue 2 June 1995
150
X300 EDM
Fuel, Emission Control & Engine Management (AJ16)
CATALYST SYSTEM EFFICIENCY - PO430
Symptom Chart
CONDITION
Fault code PO430
POSSIBLE SOURCE
1 Catalvst Efficiencv Low - B Bank
ACTION
Check for exhaust leaks, if found repair or
renew pipework and proceed to pinpoint test
AI1
Check for inlet air leak, if found repair or
renew pipework and proceed t o pinpoint test
AI1
If fault not found, disconnect both upstream
H02S sensors and proceed to pinpoint test A I
Pinpoint Tests
TEST STEP
Check harness continuity PI 128/001 to PI
105/008
OK
Open circuit
A2
Check harness continuity PI 128/002 to PI
105/006
OK
Open circuit
A3
Check harness insulation PI 129/001 to PI
105/008
OK
Full or partial
short circuit
A4
Check harness insulation PI 129/002 to PI
105l019
OK
Full or partial
short circuitt
A5
Check harness insulation PI 128/002 t o
ground
ov
AI
A6
Check harness insulation PI 129/002 to
ground
RESULT
Full or partial
short circuit
ov
Full or partial
short circuit
A7
Check harness insulation PI 128/001 to RS
0061008
OK
Short circuit
A8
Check harness insulation PI 128/002 to RS
006/008
OK
Short circuit
A9
Check harness insulation PI 129/001 to RS
006/008
OK
Short circuit
A10
Check harness continuity PI 129/002 to RS
006/008
OK
Short circuit
X300 EDM
151
ACTION
Proceed to A2
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Proceed to A5
Locate and rectify wiring fault,
re-connect harness and proceed t o
AI1
Proceed to A6
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Proceed to A7
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Proceed to A8
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Proceed to A9
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Proceed to A10
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Fit new upstream H02S sensors and
catalyst and proceed to A I 1
Locate and rectify wiring fault,
re-connect harness and proceed to
AI1
Issue 2 June 1995
Fuel, Emission Control & Engine Management (AJ16)
A1 1
A12
stop
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present Proceed t o A12
Return to Symptom Chart and repeat
OK
stop
diagnostic procedure
Fault still present Contact Jaguar Service Hotline
Issue 2 June 1995
152
X300 EDM
Fuel, Emission Control & Engine Management (AJ16)
-
EVAPORATIVE EMISSION CONTROL PO441
Symptom Chart
I
I
.
CONDITION
Fault code PO441
I
POSSIBLE SOURCE
I
I EVAP Purge Flow Fault
ACTION
I Proceed to pinpoint test A I
I
Pinpoint Tests
IA1 1I
1
A2
A3
TEST STEP
Check purge valve for siezure or blockage
Check pipework for leaks
Check for pump running continuously
RESULT
OK
Faulty
OK
Fau Ity
No
I Proceed to A2
ACTION
I
I Renew and proceed to A4
I Proceed to A3
I
1 Repair or renew and proceed to A4
Proceed to A4
Repair or renew pump and proceed to
A4
Clear fault and perform service drive cycle to OK
stop
verify fault cleared
Fault still present Proceed to A5
OK
stop
Return to Symptom Chart and repeat
diagnostic procedure
Fault still Dresent Contact Jaauar Service Hotline
Yes
A4
A5
X300 EDM
153
Issue 2 June 1995
TEST STEP
Check harness continuity PI 130/001 t o PI
119/005
OK
Open circuit
A2
Check harness continuity PI 130/002 to PI
105/006
OK
Open circuit
A3
Check harness insulation PI 130/001 to
ground
OK
A4
Check harness insulation PI 130/002 to
ground
OK
Short circuitt
A5
Check harness insulation PI 130/001 t o PI
130/002
OK
Short circuit
A6
Clear fault and perform service drive cycle to
verify fault cleared
A7
Return to Symptom Chart and repeat
diagnostic procedure
AI
Issue 2 June 1995
RESULT
154
ACTION
Proceed t o A2
Locate and rectify wiring fault,
reconnect harness and proceed to A6
Proceed to A3
Locate and rectify wiring fault,
reconnect harness and proceed t o A6
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to A6
Proceed t o A5
Locate and rectify wiring fault,
reconnect harness and proceed to A6
Proceed t o A6
Locate and rectify wiring fault,
reconnect harness and proceed t o A6
stop
Proceed to A7
stop
Contact Jaguar Service Hotline
X300 EDM
VEHlCLE SPEED SENSOR
- PO500
Symptom Chart
CONDITION
Fault code PO500
Pinpoint Tests
AI
A2
A3
0
0
0
A4
POSSIBLE SOURCE
VSS fault
CONDITION
Fault code PO506
POSSIBLE SOURCE
ACTION
Proceed to pinpoint test A I
ISC RPM Low Fault
TEST STEP
Check blockages in valve drillings
Check stepper motor for seizure
RESULT
OK
Blocked
OK
Faulty
OK
Incorrect
Check harness and connectors for condition / OK
integrity
Faulty
OK
Start and run engine at idle spped, monitor
Pid 10 ensuring value changes with throttle
Incorrect
position
Check valve is correctly fitted
Issue 2 June 1995
156
ACTION
Proceed to A2
Repair or renew valve and proceed to
A7
Proceed to A3
Repair or renew motor and proceed to
A7
Proceed to A4
Repair or renew and proceed to A7
Proceed to A5
Repair or renew and proceed to A7
Proceed to A6
Renew throttle potentiometer.
Contact Jaguar Service Hotline.
X300 EDM
CONDITION
Fault code PO507
ACTION
Proceed to pinpoint test A I
POSSIBLE SOURCE
ISC RPM High Fault
Pinpoint Tests
41
TEST STEP
Check base idle setting
RESULT
OK
42
Check blockages in valve drillings
Incorrect
OK
Blocked
43
Check stepper motor for seizure
OK
Faulty
44
45
46
OK
Incorrect
Check harness and connectors for condition I OK
integrity
Faulty
OK
Start and run engine at idle spped, monitor
Pid 10 ensuring value changes with throttle
Incorrect
position
Check valve is correctly fitted
ACTION
Proceed to A2
Reset and proceed to A8
Proceed to A3
Repair or renew valve and proceed to
A8
Proceed to A4
Repair or renew motor and proceed to
A8
Proceed t o A5
Repair or renew and proceed to A8
Proceed t o A6
Repair or renew and proceed to A8
Proceed to A7
Renew Throttle Potentiometer.
Contact Jaguar Service Hotline
A6
Check harness insulation ISC pin 3 to ISC pin OK
4
Out-of-Iimits
Proceed to A7
Renew ISC re-connect harness and
proceed t o A7
A7
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
Return to Symptom Chart and repeat
OK
diagnostic procedure
Fault still present
stop
Proceed t o A8
stop
Contact Jaguar Service Hotline
A8
Issue 2 June 1995
158
X300 EDM
Fuel, Emission Control & Engine Management (AJ16)
IDLE SPEED CONTROL - PI509
Symptom Chart
ACTION
POSSIBLE SOURCE
ISC Short Circuit Fault
Switch ignition off
Check harness and connectors for condition I
integrity, if faulty rectify and proceed to
pinpoint test A12
If fault not found disconnect ISC and proceed
to pinpoint test A I
Pinpoint Tests
41
0
42
TEST STEP
Check harness insulation PI 1131001 to PI
1131002
Check harness insulation PI 113/001 to PI
113/003
~~
Check harness insulation PI 1131001 to PI
1131004
44
Check harness insulation PI 1131002 to PI
1131003
46
Short circuit
OK
Short circuit
~
43
45
RESULT
OK
Check harness insulation PI 1131002 to PI
1131004
OK
Short circuit
Short circuit
Check insulation ISC pin 1 to ISC pin 2
Short circuit
0
47
Check insulation ISC pin 1 to ISC pin 3
OK
Short circuit
48
Check insulation ISC pin 1 to ISC pin 4
Short circuit
49
Check insulation ISC pin 2 to ISC pin 3
Short circuit
410
Check insulation ISC pin 2 to ISC pin 4
ACTION
Proceed to A2
Locate and rectify wiring fault,
re-connect harness and proceed to
A12
Proceed t o A3
Locate and rectify wiring fault,
re-connect harness and proceed to
A I2
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed t o
A I2
Proceed to A5
Locate and rectify wiring fault,
re-connect harness and proceed to
A I2
Proceed to A6
Locate and rectify wiring fault,
re-connect harness and proceed to
A I2
Proceed to A7
Locate and rectify wiring fault,
re-connect harness and proceed to
A I2
Proceed to A8
Locate and rectify wiring fault,
re-connect harness and proceed to
A I2
Proceed to A9
Locate and rectify wiring fault,
re-connect harness and proceed to
A12
Proceed to A10
Locate and rectify wiring fault,
re-connect harness and proceed to
A I2
F
Short circuit
Proceed to A I 1
Locate and rectify wiring fault,
re-connect harness and proceed to
A I2
0
X300 EDM
159
Issue 2 June 1995
OK
Short circuit
AI1
Check insulation ISC pin 3 to ISC pin 4
A12
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
Return to Symptom Chart and repeat
OK
diagnostic procedure
Fault still present
A13
Proceed to A I 2
Locate and rectify wiring fault,
reconnect harness and proceed to
A I2
stop
Proceed to A13
stop
Contact Jaguar Service Hotline
Fuel, Emission Control & Engine Management (AJI6)
PARK/ NEUTRAL SWITCH - P1514
Symptom Chart
CONDITION
Fault code PI514
POSSIBLE SOURCE
I PNPS High Load Neutral / Drive Fault
ACTION
Select 'D' (drive) position at transmission
selector and check rotary switch illuminates
on drive, if faulty rectify and proceed to
pinpoint test A6
Check harness and connectors for condition /
integrity, if faulty rectify and proceed to
pinpoint test A6
If fault not found proceed to pinpoint test A I
Pinpoint Tests
0
AI
Check harness insulation CC 013/024 to
ground
A2
Check harness insulation PI 063/005 to
ground
Short circuit
Check harness insulation PI 105/027 t o
ground
Short circuit
A4
Check harness insulation FC 002/020 to
g round/003
OK
Short circuit
A5
Check harness insulation FC 0071035 to
ground
OK
Short circuit
A6
Clear fault and perform service drive cycle to 1 OK
verify fault cleared
I Fault still present
A7
Return to Symptom Chart and repeat
diagnostic procedure
A3
OK
Short circuit
I OK
I Fault still present
Proceed to A2
Locate and rectify wiring fault,
re-connect harness and proceed t o A6
Proceed to A3
Locate and rectify wiring fault,
re-connect harness and proceed to A6
I
Proceed to A4
Locate and rectify wiring fault,
re-connect harness and proceed to A6
Proceed to A5
Locate and rectify wiring fault,
re-connect harness and proceed to A6
Proceed to A6
Locate and rectify wiring fault,
re-connect harness and proceed to A6
I Stop
I Proceed to A7
I Stop
I Contact Jaguar Service Hotline
I
I
I
I
0
e
X300 EDM
161
Issue 2 June 1995
I
Fuel, Emission Control & Engine Management (AJl6)
PARK/ NEUTRAL SWITCH - P1516
Symptom Chart
CONDITION
Fault code PI516
POSSIBLE SOURCE
Gear Change Neutral 1 Drive Fault
ACTION
Select 'D' (drive) position at transmission
selector and check rotary switch illuminates
on drive, if faulty rectify and proceed to
pinpoint test A6
Check harness and connectors for condition I
integrity, if faulty rectify and proceed to
pinpoint test A6
If fault not found proceed to pinpoint test A1
Pinpoint Tests
TEST STEP
RESULT
ACTION
A1
A2
ground
A3
A4
A5
A6
A7
diagnostic procedure
Issue 2 June 1995
162
X300 EDM
Fuel, Emission Contro & Engine
@
PARK/ NEUTRAL SWITCH - P1577
Symptom Chart
CONDITION
Fault code PI517
ACTION
Select ‘N’ (neutral) position at transmission
selector and check rotary switch illuminates
on neutral, if faulty rectify and proceed t o
pinpoint test A8
Check harness and connectors for condition I
integrity, if faulty rectify and proceed to
pinpoint test A8
If fault not found proceed to pinpoint test A I
POSSIBLE SOURCE
Cranking Neutral I Drive Fault
Pinpoint Tests
AI
0
TEST STEP
Check harness continuity CC 0131024 to PI
1051027
A2
Check voltage level at CC 0131024
A3
Check voltage level at CC 0131020 & 021
RESULT
I
I OK
I--
Open circuit
I12 Volts
Below 12V
ov
Above OV
A4
to the table above
I
A5
Check harness continuitv GB 0021002 to CC
01310 13
I OK
kOpen circuit
A6
Check harness continuity GB 0021003 to CC
013/011
Open circuit
0
A7
Check harness continuity GB 0021004 to CC
0 131012
Open circuit
A8
A9
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
Return to Symptom Chart and repeat
OK
diagnostic procedure
Fault still present
0
X300 EDM
163
m
.
Fuel, Emission Control & Engine Management (AJ16)
-
CODES COMMON TO ECM AND TCM - PO605
Symptom Chart
CONDITION
Fault code PO605
POSSIBLE SOURCE
ACTION
Control Module Internal ROM Test Fault Run service drive cycle and check TCM in
default mode, if faulty rectify and proceed to
pinpoint test A2
Check harness and connectors for condition I
integrity, if faulty rectify and proceed to
pinpoint test A2
If fault not found proceed to pinpoint test A I
TEST STEP
A2
A3
RESULT
Faulty
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
Return to Symptom Chart and repeat
diagnostic procedure
Issue 2 June 1995
ACTION
Renew and proceed to A2
stop
Proceed to A3
OK
stop
Fault still present Contact Jaguar Service Hotline
164
X300 EDM
0
CODES COMMON T O ECM A N D TCM -P1775
Symptom Chart
CONDITION
Fault code PI775
POSSIBLE SOURCE
MIL illumination request from TCM
ACTION
Run service drive cycle and check TCM in
default mode, if faulty rectify and proceed to
pinpoint test A2
Check harness and connectors for condition /
integrity, if faulty rectify and proceed to
pinpoint test A2
If fault not found proceed to pinpoint test A I
_ _ _ _ _ ~ ~
Pinpoint Tests
RESULT
TEST STEP
AI
A2
Check TCM
OK
Faulty
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present
OK
Return to Symptom Chart and repeat
diagnostic procedure
Fault still present
ACTION
Proceed to A2
Renew and proceed to A2
stop
Proceed to A3
stop
Contact Jaguar Service Hotline
p
p
0
0
0
A3
Fue , Emission Control & Engine Management (AJ16)
CODES C O M M O N T O ECM AND TCM - P1776
Symptom Chart
POSSIBLE SOURCE
Ignition Retard Request Duration Fault
RESULT
OK
Open Circuit
TEST STEP
Check harness continuity PI 105/026 to CC
0071032
Check PWM signal using an oscilloscope,
signal should be within limits of 10 - 19%
(1.1 - 2.lms)
I OK
Check ECM for stored fault codes
I OK
ji
Issue 2 June 1995
ACTION
Run engine for 20 seconds to check if TCM in
substitute function (ie sport mode cannot be
engaged), if faulty rectify and proceed to
pinpoint test A4
Check harness and connectors (ECM & TCM)
for condition / integrity, if faulty rectify and
proceed to pinpoint test A4
If fault not found proceed to pinpoint test A I
ACTION
Proceed to A2
Locate and rectify wiring fault,
reconnect harness and proceed to A4
Proceed to A3
Renew TCM and proceed to A4
I
Faulty
166
Proceed to A4
Renew ECM. Contact Jaguar Service
Hotline
X300 EDM
Fuel, Emission Control & Engine
CODES COMMON T O ECM A N D TCM - P1777
@
Symptom Chart
CONDITION
Fault code PI777
POSSIBLE SOURCE
Ignition Retard Request Circuit Fault
Pinpoint Tests
AI
rn
.A2
A3
I
A4
A5
X300 EDM
TEST STEP
Check harness continuity PI 105/026 to CC
007/032
RESULT
OK
Open Circuit
Check PWM signal using an oscilloscope,
signal should be within limits of 10 - 19%
(1.1 - 2.lms)
OK
ACTION
Proceed to A2
Locate and rectify wiring fault,
re-connect harness and proceed to A4
Proceed to A3
Out-of-limits
Renew TCM and proceed to A4
OK
Proceed to A4
Faulty
Renew and proceed to A4
stop
Clear fault and perform service drive cycle to OK
1
.
verify fault cleared
Fault still present I Proceed to A5
OK
stop
Return to Symptom Chart and repeat
diagnostic procedure
Fault still present Contact Jaguar Service Hotline
Interrogate ECM for stored fault codes
I
I
167
Issue 2 June 1995
CONDITION
Fault code PI794
ACTION
Proceed to pinpoint test A I
POSSIBLE SOURCE
System Voltage Fault
RESULT
AI
A2
A3
A4
A5
A6
A7
Run engine upto 2,000 revs to check if TCM
in substitute function (ie sport mode cannot
be engaged), if faulty rectify and proceed to
pinpoint test A
OK
Open Circuit
I
ACTION
1 Proceed to A2
Locate and rectify wiring fault,
reconnect harness and proceed to A6
2 12v
< 12v
Proceed to A3
Faulty charging system, rectify Switch
ignition off disconnect TCM and
proceed to A6
Proceed to A4
With engine running at 2,000 revs check
2 12v
voltage at TCM connector pin 1
Harness fault, locate, rectify and
< 12v
proceed to A6
Proceed to A5
With engine running at 2,000 revs check
Yes
TCM runs in default mode
Check relay contacts for high
No
resistance and proceed to A6
Proceed to A6
OK
Interrogate TCM for stored fault codes
Renew TCM and proceed to A6
Faulty
stop
Clear fault and perform service drive cycle to OK
verify fault cleared
Fault still present Proceed to A7
Return to Symptom Chart and repeat
OK
stop
diagnostic procedure
Fault still present Contact Jaguar Service Hotline
With engine running at 2,000 revs check
battery terminal voltage
Issue 2 June 1995
168
X300 EDM