SERVICE BULLETIN
Contents
1. exist ABS VDC control unit and proceed with diagnosis refer to the applicable service manual NO 3 Do any engine related 1 3 Refer to applicable service manual for engine codes exist together with B0221 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 Refer to the applicable service manual for power source to ECU TCU BIU YES Power source circuit failure and proceed with ABS VDC Unit and combination troubleshooting meter 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 NO 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 3 5 Does any trouble code stay ee if ignition switch is turned off and on No need to start the engine Refer to applicable service manual for the remaining trouble code s and proceed with troubleshooting NO 6 Monitor the BIU data by Subaru Select Monitor Are th2. ATTENTION GENERAL MANAGER PARTS MANAGER CLAIMS PERSONNEL SERVICE MANAGER IMPORTANT All Service Personnel Should Read and Initial SERVICE BULLETIN APPLICABILITY 2005MY O6MY Legacy Outback NUMBER 11 81 06 equipped with H4 and H6 DATE 11 16 06 2006MY B9 Tribeca 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 He 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 a CAUTION VEHICLE SERVICING PERFORMED BY UNTRAINED PERSONS COULD Po OT RESULT IN SERIOUS INJURY TO THOSE PERSONS OR TO OTHERS YR duc tae those technicians of conditio
3. e signals for fuel remaining YES Refer to applicable service manual for the affected outside temperature lighting sensor trouble and proceed with troubleshooting 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 4 Bulletin Number 11 81 06 Date 11 16 06
4. ns 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 instruc Ra SERVICE tions 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 Subaru Service Bulletins are intended for use by professional technicians ONLY They are written to inform Bulletin Number 11 81 06 Date 11 16 06 Page 1 ITEM PATTERN LISTING O5MY LEGACY OUTBACK O6MY LEGACY H4 amp H OUTBACK H 06MY LEGACY OUTBACK H4 06MY B9 TRIBECA DTC B0221 B0223 P0600 1 a 2 J3 po o a i o oe Check Engine LightON o o 0 VDC OFF indicator VDC Kae S Odometer indicated Erh o o 0 lll Cruise Control lamp blinks 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 indi cates maximum due to fail safe mode Coolant Temperature Meter indicates maximum 3 TECHNICAL EXPLANATION The Body Integrated Control Unit BIU monitor
5. s 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 e Near powerful radio equipment such as truck radios e Poor contact on connectors e Noises emitted by non genuine accessories or modified electrical circuits e Unstable battery voltage due to non genuine accessories or modified electrical circuits e Starting the engine when battery is weak e 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 2 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 YES Do DTC B0223 and P1718 ABS VDC malfunction is possible Check DTC s in
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