Download SERVICE BULLETIN

ATTENTION:
GENERAL MANAGER
CLAIMS PERSONNEL
❏
❏
PARTS MANAGER
SERVICE MANAGER
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❏
IMPORTANT - All Service Personnel Should Read and Initial
SERVICE BULLETIN
APPLICABILITY: 2005MY~06MY Legacy/Outback
equipped with H4 and H6
2006MY B9 Tribeca
NUMBER: 11-81-06
DATE: 11/16/06
SUBJECT: Diagnostic Trouble Codes (DTC) P0600,
B0221 and/or B0223 (Codes for
communication error)
introduction
This service bulletin explains how to diagnose P0600, B0221, and/or B0223 effectively,
avoiding unnecessary diagnostics. When the communication system of the vehicle becomes
unstable, multiple trouble codes and multiple problem phenomena may occur.
repair Procedure Information
There are 6 patterns for the combination of trouble codes and problem phenomena listed in
the following chart (located on page 2 of this bulletin).
For example, Pattern 1 on the chart is showing you that DTC B0221, B0223, and P0600 exist
and problem phenomena are Check Engine Light ON, VDC light ON, Coolant Temperature
Meter indicates maximum, Odometer indicates ”Er Hc”, Cruise Control is cancelled and
Cruise Control Lamp blinks.
Pattern 5 is showing you that DTC B0221 exists and problem phenomena are, Coolant
Temperature Meter indicates maximum and the Odometer indicates “Er Hc”.
Continued on Next Page
CAUTION: VEHICLE SERVICING PERFORMED BY UNTRAINED PERSONS COULD
RESULT IN SERIOUS INJURY TO THOSE PERSONS OR TO OTHERS.
Subaru Service Bulletins are intended for use by professional technicians ONLY. They are written to inform
those technicians of conditions that may occur in some vehicles, or to provide information that could assist
in the proper servicing of the vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do the job correctly and safely. If a condition is described, DO NOT assume that this
Service Bulletin applies to your vehicle, or that your vehicle will have that condition.
Bulletin Number: 11-81-06; Date: 11/16/06
Page item
Pattern listing
05my Legacy/outback
h4 & h6;
06my legacy/outback h4
DTC
1
2
B0221
O
O
B0223
O
P0600 (*1)
O
O
O
O
O
O
VDC OFF indicator/ VDC
warning light ON (*2)
O
O
O
Coolant Temperature Meter
indicates maximum (*3)
O
O
Odometer indicated “Er HC”
O
O
O
Cruise Control is cancelled/
Cruise Control lamp blinks
O
O
O
Phenomena Check Engine Light ON
3
O
06my legacy/
outback h6;
06my b9 tribeca
4
5
O
O
6
O
O
O
O
O
O
O
O
O
(*1) When DTC P0600 is stored, the communication line may not be functioning properly.
In that case, the system goes to fail safe mode and driver may feel less engine power or
vibration.
(*2) In the case of a VDC related communication malfunction: VDC OFF indicator/VDC
warning light turns ON due to fail safe mode.
(*3) In the case of an engine communication malfunction: Coolant Temperature Meter indicates maximum due to fail safe mode.
Technical Explanation
The Body Integrated Control Unit (BIU) monitors whole communication lines and it detects
communication errors/troubles. When it detects problems, the system goes to fail safe mode
and displays Check Engine Light ON, VDC light ON, Coolant Temperature Meter indicates
maximum, Odometer indicates ”Er Hc”, Cruise Control is cancelled and Cruise Control Lamp
blinks to avoid the problem from becoming more severe. B0221, B0223, P0600 are resultant
codes.
To avoid a severe system abnormality, the BIU monitors communication instability in a very
short time period. The communication system may become unstable under the following
circumstances:
•
•
•
•
•
•
Near powerful radio equipment, such as truck radios
Poor contact on connectors
Noises emitted by non-genuine accessories or modified electrical circuits
Unstable battery voltage due to non-genuine accessories or modified electrical circuits
Starting the engine when battery is weak
Repeating ignition switch ON and OFF quickly or repeating engine starting and stopping
In these cases, communication stability can be restored by the self-recovery function, but the
malfunction display and fail-safe mode continue to alert the driver until the ignition switch is
Continued on Next Page
Page Bulletin Number: 11-81-06; Date: 11/16/06
turned off.
Troubleshooting Flow Chart
Check for DTC(s) and vehicle condition.
1. Do DTC B0221, B0223,
and/or P0600 exist?
YES
2. Do DTC B0223 and P1718
exist?
YES
ABS/VDC malfunction is possible. Check DTC(s) in
ABS/VDC control unit and proceed with diagnosis
(refer to the applicable service manual).
NO
3. Do any engine related
codes exist together with B0221?
YES
Refer to applicable service manual for engine
related code(s) and proceed with troubleshooting.
If code P0600, refer to LAN SYSTEM
(DIAGNOSTICS) Basic Diagnostic Procedure.
NO
If other than P0600, return to step 3 after the
engine code diagnosis.
4. Is there any abnormality on
power source to ECU, TCU, BIU,
ABS/VDC Unit, and combination
meter?
NO
YES
Refer to the applicable service manual for
power source circuit failure and proceed with
troubleshooting.
ECU: ENGINE (DIAGNOSTICS)
Diagnostics for Engine Starting Failure
Inspection of ECM power supply
TCU: AUTO TRANSMISSION (DIAGNOSTICS)
Diagnostics procedure for Subaru Select
Monitor Communication
COMMUNICATION FOR INITIALIZING
IMPOSSIBLE
BIU: Refer to B0103
ABS/VDC: Refer to C0109/C0042
Combination meter:
Instrumentation/Driver Info
Combination Meter System
Check power supply and ground circuit
Continued on Next Page
Bulletin Number: 11-81-06; Date: 11/16/06
Page 5. Does any trouble code stay
if ignition switch is turned off and
on?
(No need to start the engine.)
YES
Refer to applicable service manual for the
remaining trouble code(s) and proceed with
troubleshooting.
YES
Refer to applicable service manual for the affected
sensor trouble and proceed with troubleshooting.
NO
6. Monitor the BIU data by
Subaru Select Monitor. Are
the signals for fuel remaining,
outside temperature, lighting
position, coolant temperature, or
gear position abnormal?
NO
This is a temporary unstable
communication phenomenon. Clear
the memory to delete the code(s).
If any of the steps 2 through 6 direct you to “Yes”, and you are able to repair the problem,
this is not a temporary unstable communication phenomenon.
Page Bulletin Number: 11-81-06; Date: 11/16/06