Download PSI Certified Stationary Engine Fuel System

DTC 122 TPS 1 Signal Voltage Low
Step
1
Action
Did you perform the On-Board (OBD) System
Check?
v
v
2
3
Key ON, Engine OFF
DST (Diagnostic Scan Tool) connected in
DBW (Drive by Wire) throttle test mode
Does the DST display TPS 1 voltage of 0.200
volts or less with the throttle closed?
v Slowly depress Foot Pedal while observing
TPS 1 voltage
Does TPS 1 voltage ever fall below 0.200 volts?
v
v
4
5
6
7
8
Key OFF
Disconnect the electronic throttle connector
C017
v Jump the 5 volt reference circuit pin 3 and
TPS 1 signal circuit pin 6 together at the
throttle connector
v Key ON
Does DST display TPS 1 voltage of 4.0 volts or
greater?
v Key OFF
v Disconnect ECM wire harness connector
C001
v Using a DVOM check continuity between the
electronic throttle connector signal pin 6 and
ECM connector TPS 1 signal pin 20
Do have continuity between them?
v Replace ECM
Is the replacement complete?
v Inspect the throttle wire harness connector
terminals for damage, corrosion or contamination
Did you find a problem?
v Replace the electronic throttle
Is the replacement complete?
121
Value(s)
Yes
No
-
Go to Step
(2)
Go to OBD
System Check
Section
Go to Step (3)
Go to Step
(4)
Go to Step
(4)
Go to Step
(7)
Intermittent
problem
Go to Intermittent section
Go to Step (5)
Go to Step
(6)
Repair the
circuit as necessary. Refer
to Wiring Repairs in
Engine Electrical.
Go to Step
(9)
-
Repair the
circuit as necessary.
Refer to Wiring Repairs in
Engine Electrical.
Go to Step
(9)
Go to Step (8)
-