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List Of Diagnostic Codes

WARNING: This page is about a different car, the 2014 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • SSM3 can be used to display DTC of CAN communication system by ECM.
  • For DTCs related to CAN communication system, always start the troubleshooting according to the procedure described in "How to troubleshoot" because the cause cannot be identified only from DTC. (Refer to HOW TO TROUBLESHOOT  )
  • When the procedure described in "DTC check" is followed, DTC will be displayed only if the error condition is still present.
  1. Main body ECM (Multiplex network body computer) integrated unit mode (SSM3 display name)
    DTC Diagnostic items (SSM3 display name) Status DTC detecting conditions DTC check Warning light Retention of DTC
    U0073 [CAN-HS bus off] Communication is disabled due to high-speed CAN communication error When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the main body ECM (Multiplex network body computer) power supply is 10 V or more
    		 Wait 15 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0100 [CAN-HS ECM no-receive data] Main body ECM (Multiplex network body computer) remains unable to receive data from the engine control computer. When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the main body ECM (Multiplex network body computer) power supply is 10 V or more
    		 Wait 15 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0101 [CAN-HS TCM no-receive data] Main body ECM (Multiplex network body computer) remains unable to receive data from the transmission control computer assembly. When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the main body ECM (Multiplex network body computer) power supply is 10 V or more
    		 Wait 15 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0122 [CAN-HS VDC no-receive data] Main body ECM (Multiplex network body computer) remains unable to receive data from the brake actuator assembly. When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the main body ECM (Multiplex network body computer) power supply is 10 V or more
    		 Wait 15 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0155 [CAN-HS meter no-receive data] Main body ECM (Multiplex network body computer) remains unable to receive data from the combination meter assembly. When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the main body ECM (Multiplex network body computer) power supply is 10 V or more
    		 Wait 15 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0164 [CAN-HS A/C no-receive data] Main body ECM (Multiplex network body computer) remains unable to receive data from the air conditioner amplifier assembly. When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the main body ECM (Multiplex network body computer) power supply is 10 V or more
    		 Wait 15 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0327 [CAN-HS Collation no-receive data] Main body ECM (Multiplex network body computer) remains unable to receive data from the collation ECM (Smart key computer assembly). When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the main body ECM (Multiplex network body computer) power supply is 10 V or more
    		 Wait 15 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0401 [CAN-HS EGI data error] Main body ECM (Multiplex network body computer) detects an error in the data received from the engine control computer When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the main body ECM (Multiplex network body computer) power supply is 10 V or more
    		 Wait 15 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0402 [CAN-HS TCU data error] Main body ECM (Multiplex network body computer) detects an error in the data received from the transmission control computer assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the main body ECM (Multiplex network body computer) power supply is 10 V or more
    		 Wait 15 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0416 [CAN-HS VDC data error] Main body ECM (Multiplex network body computer) detects an error in the data received from the brake actuator assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the main body ECM (Multiplex network body computer) power supply is 10 V or more
    		 Wait 15 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0423 [CAN-HS meter unit data error] Main body ECM (Multiplex network body computer) detects an error in the data received from the combination meter assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the main body ECM (Multiplex network body computer) power supply is 10 V or more
    		 Wait 15 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0424 [CAN-HS A/C data error] Main body ECM (Multiplex network body computer) detects an error in the data received from the air conditioner amplifier assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the main body ECM (Multiplex network body computer) power supply is 10 V or more
    		 Wait 15 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U1201 [CAN-HS counter abnormal] Communication is unstable because of high-speed CAN communication error. When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the main body ECM (Multiplex network body computer) power supply is 10 V or more
    		 Wait 15 seconds or more after IG ON - Retained until DTC is cleared by the tool
    NOTE: Diagnosis data is transmitted via CAN communication line.
  2. Combination meter assembly/Combination meter (SSM3 display name)
    DTC Diagnostic items (SSM3 display name) Status DTC detecting conditions DTC check Warning light Retention of DTC
    U0073 - (Bus off) Communication is disabled due to high-speed CAN communication error When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the combination meter assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0100 [Lost Communication With EGI] Combination meter assembly remains unable to receive data from the engine control computer When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the combination meter assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0122 [Lost Communication with Brake System Control Module] Combination meter assembly remains unable to receive data from the brake actuator assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the combination meter assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0131 [Lost Communication With EPS] Combination meter assembly remains unable to receive data from the power steering computer assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the combination meter assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0140 [Lost Communication With BIU] Combination meter assembly remains unable to receive data from the main body ECM (Multiplex network body computer) When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the combination meter assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0151 [Lost Communication With A/B] Combination meter assembly remains unable to receive data from the airbag sensor assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the combination meter assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    NOTE: Diagnosis data is transmitted via CAN communication line.
  3. Collation ECM (Smart key computer assembly)/Keyless access system (SSM3 display name)
    DTC Diagnostic items (SSM3 display name) Status DTC detecting conditions DTC check Warning light Retention of DTC
    U0073 [CAN failure/A-circuit bus off detection] Communication is disabled due to high-speed CAN communication error When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the collation ECM (Smart key computer assembly) power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0100 [Lost Communication With ECM/PCM "A"] Collation ECM (Smart key computer assembly) remains unable to receive data from the engine control computer When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the collation ECM (Smart key computer assembly) power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0101 [Lost Communication With TCM] Collation ECM (Smart key computer assembly) remains unable to receive data from the transmission control computer assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the collation ECM (Smart key computer assembly) power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0122 [Lost Communication With Vehicle Dynamics Control Module] Collation ECM (Smart key computer assembly) remains unable to receive data from the brake actuator assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the collation ECM (Smart key computer assembly) power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0140 [Lost Communication With Body Control Module] Collation ECM (Smart key computer assembly) remains unable to receive data from the main body ECM (Multiplex network body computer) When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the collation ECM (Smart key computer assembly) power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0155 [Nonarrival of H-CAN data(METER)] Collation ECM (Smart key computer assembly) remains unable to receive data from the combination meter assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the collation ECM (Smart key computer assembly) power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0401 [Invalid Data Received From ECM/PCM "A"] Collation ECM (Smart key computer assembly) detects an error in the data received from the engine control computer When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the collation ECM (Smart key computer assembly) power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0422 [Invalid Data Received From Body Control Module] Collation ECM (Smart key computer assembly) detects an error in the data received from the main body ECM (Multiplex network body computer) When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the collation ECM (Smart key computer assembly) power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    (1) Error is detected with IG ON.
    NOTE: Diagnosis data is transmitted via CAN communication line.
  4. Engine control computer/Engine (SSM3 display name)
    DTC Diagnostic items (SSM3 display name) Status DTC detecting conditions DTC check Warning light Retention of DTC
    U0073 [CAN failure/A-circuit bus off detection] Communication is disabled due to high-speed CAN communication error When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the engine control computer power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON Check engine light is ON Retained until DTC is cleared by the tool
    U0101 [Lost Communication With TCM] Engine control computer remains unable to receive data from the transmission control computer assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the engine control computer power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON Check engine light is ON Retained until DTC is cleared by the tool
    U0122 [Lost Communication With Vehicle Dynamics Control Module] Engine control computer remains unable to receive data from the brake actuator assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the engine control computer power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON Check engine light is ON Retained until DTC is cleared by the tool
    U0155 [Nonarrival of H-CAN data(METER)] Engine control computer remains unable to receive data from the combination meter assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the engine control computer power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON Check engine light is ON Retained until DTC is cleared by the tool
    U0402 [Invalid Data Received From TCM] Engine control computer detects an error in the data transmitted to the transmission control computer assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the engine control computer power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON Check engine light is ON Retained until DTC is cleared by the tool
    U0416 [Invalid Data Received From Vehicle Dynamics Control Module] Engine control computer detects an error in the data received from the brake actuator assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the engine control computer power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON Check engine light is ON Retained until DTC is cleared by the tool
    U0423 [Invalid Data Received From Instrument Panel Cluster Control Module] Engine control computer detects an error in the data received from the combination meter assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the engine control computer power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON Check engine light is ON Retained until DTC is cleared by the tool
    NOTE: Diagnosis data is transmitted via CAN communication line.
  5. Transmission control computer assembly/Transmission (SSM3 display name)
    DTC Diagnostic items (SSM3 display name) Status DTC detecting conditions DTC check Warning light Retention of DTC
    U0073 [CAN failure/A-circuit bus off detection] Communication is disabled due to high-speed CAN communication error When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the transmission control computer assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0100 [Lost Communication With ECM/PCM "A"] Transmission control computer assembly remains unable to receive data from the engine control computer When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the transmission control computer assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0122 [Lost Communication With Vehicle Dynamics Control Module] Transmission control computer assembly remains unable to receive data from the brake actuator assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the transmission control computer assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0140 [Lost Communication With Body Control Module] Transmission control computer assembly remains unable to receive data from the main body ECM (Multiplex network body computer)
    • One or more second after IG ON
    • The voltage of the transmission control computer assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0401 [Invalid Data Received From ECM/PCM "A"] Transmission control computer assembly detects an error in the data received from the engine control computer
    • One or more second after IG ON
    • The voltage of the transmission control computer assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0416 [Invalid Data Received From Vehicle Dynamics Control Module] Transmission control computer assembly detects an error in the data received from the brake actuator assembly
    • One or more second after IG ON
    • The voltage of the transmission control computer assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0422 [Invalid Data Received From Body Control Module] Transmission control computer assembly detects an error in the data received from the main body ECM (multiplex network body computer)
    • One or more second after IG ON
    • The voltage of the transmission control computer assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    NOTE: Diagnosis data is transmitted via CAN communication line.
  6. Brake actuator assembly/Brake control-ABS/VDC system (SSM3 display name)
    DTC Diagnostic items (SSM3 display name) Status DTC detecting conditions DTC check Warning light Retention of DTC
    U0073 [CAN failure/A-circuit bus off detection] Communication is disabled due to high-speed CAN communication error When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the brake actuator assembly power supply is 10 V or more
    		 Wait 60 seconds or more after IG ON ABS warning light is ON Retained until DTC is cleared by the tool
    U0100 [Lost Communication With ECM/PCM "A"] Brake actuator assembly remains unable to receive data from the engine control computer When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the brake actuator assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON ABS warning light is ON Retained until DTC is cleared by the tool
    U0101 [Lost Communication With TCM] Brake actuator assembly remains unable to receive data from the transmission control computer assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the brake actuator assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON ABS warning light is ON Retained until DTC is cleared by the tool
    U0126 [Nonarrival of H-CAN data(Steering angle sensor)] Brake actuator assembly remains unable to receive data from the steering sensor (Spiral cable sub-assembly) When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the brake actuator assembly power supply is 10 V or more
    		 Wait 60 seconds or more after IG ON ABS warning light is ON Retained until DTC is cleared by the tool
    NOTE: Diagnosis data is transmitted via CAN communication line.
  7. Spiral cable sub-assembly (with sensor)/- (SSM3 display name)
    NOTE: Spiral cable sub-assembly (with sensor) is connected to CAN communication line but does not output DTC related with CAN communication.
  8. Power steering computer assembly/Power steering (SSM3 display name)
    DTC Diagnostic items (SSM3 display name) Status DTC detecting conditions DTC check Warning light Retention of DTC
    U0100 [Lost Communication With ECM/PCM "A"] Power steering computer assembly remains unable to receive data from the engine control computer When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the power steering computer assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON EPS warning light is ON Retained until DTC is cleared by the tool
    U0122 [Lost Communication With Vehicle Dynamics Control Module] Power steering computer assembly remains unable to receive data from the brake actuator assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the power steering computer assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON EPS warning light is ON Retained until DTC is cleared by the tool
    U0416 [Invalid Data Received From Vehicle Dynamics Control Module] Power steering computer assembly detects an error in the data received from the brake actuator assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the power steering computer assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON EPS warning light is ON Retained until DTC is cleared by the tool
    NOTE: Diagnosis data is transmitted via CAN communication line.
  9. Air conditioner amplifier assembly/Air conditioner (SSM3 display name)
    DTC Diagnostic items (SSM3 display name) Status DTC detecting conditions DTC check Warning light Retention of DTC
    U0073 [CAN failure/A-circuit bus off detection] Communication is disabled due to high-speed CAN communication error When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the air conditioner amplifier assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0100 [Lost Communication With ECM/PCM "A"] Air conditioner amplifier assembly remains unable to receive data from the engine control computer When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the air conditioner amplifier assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0101 [Lost Communication With TCM] Air conditioner amplifier assembly remains unable to receive data from the transmission control computer assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the air conditioner amplifier assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0122 [Lost Communication With Vehicle Dynamics Control Module] Air conditioner amplifier assembly remains unable to receive data from the brake actuator assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the air conditioner amplifier assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0140 [Lost Communication With Body Control Module] Air conditioner amplifier assembly remains unable to receive data from the main body ECM (Multiplex network body computer) When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the air conditioner amplifier assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0155 [Nonarrival of H-CAN data(METER)] Air conditioner amplifier assembly remains unable to receive data from the combination meter assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the air conditioner amplifier assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0401 [Invalid Data Received From ECM/PCM "A"] Air conditioner amplifier assembly has been unable to receive data transmitted to the engine control computer for one second or more When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the air conditioner amplifier assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0402 [Invalid Data Received From TCM] Air conditioner amplifier assembly detects an error in the data received from the transmission control computer assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the air conditioner amplifier assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0416 [Invalid Data Received From Vehicle Dynamics Control Module] Air conditioner amplifier assembly detects an error in the data received from the brake actuator assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the air conditioner amplifier assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0422 [Invalid Data Received From Body Control Module] Air conditioner amplifier assembly detects an error in the data received from the main body ECM (Multiplex network body computer) When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the air conditioner amplifier assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    U0423 [Invalid Data Received From Instrument Panel Cluster Control Module] Air conditioner amplifier assembly detects an error in the data received from the combination meter assembly When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the air conditioner amplifier assembly power supply is 10 V or more
    		 Wait 10 seconds or more after IG ON - Retained until DTC is cleared by the tool
    NOTE: Diagnosis data is transmitted via CAN communication line.
  10. Airbag sensor assembly/Airbag system (SSM3 display name)
    DTC Diagnostic items (SSM3 display name) Status DTC detecting conditions DTC check Warning light Retention of DTC
    U0073 [CAN failure/A-circuit bus off detection] Communication is disabled due to high-speed CAN communication error When all of the following conditions are met:
    • One or more second after IG ON
    • The voltage of the airbag sensor assembly power supply is 10 V or more
    		 Wait 60 seconds or more after IG ON Airbag warning light is ON Retained until DTC is cleared by the tool
    NOTE: Diagnosis data is transmitted via CAN communication line.

    Check using DTC check sheet

    • DTC check sheet
      Fig 1: DTC Check Sheet
      G08552889Courtesy of SUBARU OF AMERICA, INC.

    Procedure

    1. Module installation check
      1. Put "-" mark in the box under the installation check column if the vehicle to be inspected does not have the relevant module.
      2. Put "-" marks in all blank boxes in the same row that the "-" mark has been placed.
    2. Bus off detection and missing data detection
      NOTE: DTC will not be displayed if CAN diagnostic module has an open harness which causes missing data, etc. (current malfunction). In this case, perform an inspection according to "Check using the check sheet of communication for initializing", and then use the following sheet to confirm that it has changed to a past malfunction.
      1. In the check sheet, put "x" in the box under the DTCs detected by each module.
      2. Identify and repair the faulty part by referring to the example of missing DTC detection. (Refer to the example of missing DTC detection)
    3. Data error detection
      NOTE: If any P.B.C cord is detected when the engine is restarted, perform the diagnosis for the P.B.C cord first.
      If bus off and missing data are present, perform the diagnosis for these problems first.
      1. If more than one module detects DTC for the same module, replace the module being detected.
      2. If only one module detects DTC, replace the module being detected.
      3. If DTC recurs, re-install the module which has been replaced, and replace the module which detected DTC.
      4. If DTC recurs, replace both modules.

    Example of missing DTC detection

    Network diagram

    Fig 2: CAN Communication Network Diagram
    G08552872Courtesy of SUBARU OF AMERICA, INC.
    Wiring location Type Part CANH CANL
    No. 1 Main line ECM vicinity D43-9-A33-19 D43-20-A33-18
    No. 2 Main line J/C1-J/C2 D43-1-A17-7 D43-12-A17-18
    No. 3 Main line VDCCM vicinity A17-6-A5-26 A17-17-A5-14
    No. 4 Subline A/C CM vicinity D43-10-D19-13 D43-21-D19-12
    No. 5 Subline Airbag CM vicinity D43-8-D27-13 D43-19-D27-22
    No. 6 Subline Steering angle sensor vicinity D43-6-D56-3 D43-17-D56-2
    No. 7 Subline Data link connector vicinity D43-5-D10-6 D43-16-D10-14
    No. 8 Subline Keyless access CM D43-4-D41-14 D43-15-D41-15
    No. 9 Subline Body integrated unit D43-3-D5-14 D43-14-D5-13
    No. 10 Subline Combination meter vicinity D43-2-D7-6 D43-13-D7-7
    No. 11 Subline Power steering CM vicinity A17-8-A15-1 A17-19-A15-7
    No. 12 Subline TCM vicinity A17-5-A18-29 A17-16-A18-28

    No. 6 is open NW

    Fig 3: Communication Initialization Check Sheet (No. 6 Is Open)
    G08552891Courtesy of SUBARU OF AMERICA, INC.
  11. DTC matrix table
    1. For the past communication malfunctions of the ECMs and sensors connected to VBUS, the defective part can be identified based on the following matrix tables.
      NOTE:
      • Use the matrix table below to identify the part which has lost communication according to the DTC output by each ECM connected to CAN communication line.
      • For diagnosis of open circuit in sub-line and lost communication, use "Check sheet of communication for initializing". The check sheet enables quick identification of a defective part because if an ECM or sensor is connected to an open sub-line, it will not respond.
      Diagnosis result Description
      Source ECM DTC output Sub-lines 57-63 Ω(Transmission control computer assembly system) (Refer to SUB-LINES 57-63 Ω(TRANSMISSION CONTROL COMPUTER assembly SYSTEM)  ) Sub-lines 57-63 Ω(Brake actuator assembly system) (Refer to SUB-LINES 57-63 Ω(BRAKE ACTUATOR SYSTEM)  ) Sub-lines 57-63 Ω(Spiral cable sub-assembly system) (Refer to SUB-LINES 57-63 Ω(SPIRAL CABLE SUB-ASSEMBLY SYSTEM)  ) Sub-lines 57-63 Ω(Engine control computer system) (Refer to SUB-LINES 57-63 Ω(ENGINE CONTROL COMPUTER SYSTEM)  )
      Transmission control computer assembly U0073 ◦(1) x x x
      U0100 ◦(1) x x ◦
      U0122 ◦(1) ◦ x x
      U0140 ◦(1) x x x
      U0401 x(1) x x x
      U0416 x(1) x x x
      U0422 x(1) x x x
      Brake actuator assembly U0073 x ◦(1) x x
      U0100 x ◦(1) x ◦
      U0101 ◦ ◦(1) x x
      U0126 x ◦(1) ◦ x
      Engine control computer U0073 x x x ◦(1)
      U0101 ◦ x x ◦(1)
      U0122 x ◦ x ◦(1)
      U0155 x x x ◦(1)
      U0402 x x x x(1)
      U0416 x x x x(1)
      U0423 x x x x(1)
      Airbag sensor assembly U0073 x x x x
      Power steering computer assembly U0100 x x x ◦
      U0122 x ◦ x x
      U0416 x x x x
      Air conditioner amplifier assembly U0073 x x x x
      U0100 x x x ◦
      U0101 ◦ x x x
      U0122 x ◦ x x
      U0140 x x x x
      U0155 x x x x
      U0401 x x x x
      U0402 x x x x
      U0416 x x x x
      U0422 x x x x
      U0423 x x x x
      Combination meter assembly U0073 x x x x
      U0100 x x x ◦
      U0122 x ◦ x x
      U0131 x x x x
      U0140 x x x x
      U0151 x x x x
      Collation ECM (Smart key computer assembly) U0073 x x x x
      U0100 x x x ◦
      U0101 ◦ x x x
      U0122 x ◦ x x
      U0140 x x x x
      U0155 x x x x
      U0401 x x x x
      U0422 x x x x
      Main body ECM (Multiplex network body computer) U0073 x x x x
      U0100 x x x ◦
      U0101 ◦ x x x
      U0122 x ◦ x x
      U0155 x x x x
      U0164 x x x x
      U0327 x x x x
      U0401 x x x x
      U0402 x x x x
      U0416 x x x x
      U0423 x x x x
      U0424 x x x x
      U1201 x x x x
      (1) DTC cannot be output in case of lost communication. In case of an open circuit in the CAN bus main line, short circuit between CAN bus lines (CAN-H and CAN-L), CAN bus +B short, or CAN bus GND short, many DTCs may be output by most ECMs (or sensors) on CAN bus or several communication error messages may be displayed on SSM3. To solve this problem, start the inspection using "Check sheet of communication for initializing.". (Refer to CHECK USING "CHECK SHEET OF COMMUNICATION FOR INITIALIZING" ), In case of either end of the CAN bus sub-line is open, irrelevant DTCs may be output (DTC may not be displayed properly) or communication error messages may be displayed on SSM3.
      Diagnosis result Description
      Source ECM DTC output Sub-lines 57-63 Ω(A/B CM system) (Refer to SUB-LINES 57-63 Ω(AIRBAG SYSTEM)  ) Sub-lines 57-63 Ω(Electric power steering system) (Refer to SUB-LINES 57-63 Ω(ELECTRIC POWER STEERING SYSTEM)  ) Sub-lines 57-63 Ω(Air conditioner amplifier assembly system) (Refer to SUB-LINES 57-63 Ω(AIR CONDITIONER CONTROL PANEL SYSTEM)  ) Sub-lines 57-63 Ω(Combination meter assembly system) (Refer to SUB-LINES 57-63 Ω(COMBINATION METER assembly SYSTEM)  )
      Transmission control computer assembly U0073 x x x x
      U0100 x x x x
      U0122 x x x x
      U0140 x x x x
      U0401 x x x x
      U0416 x x x x
      U0422 x x x x
      Brake actuator assembly U0073 x x x x
      U0100 x x x x
      U0101 x x x x
      U0126 x x x x
      Engine control computer U0073 x x x x
      U0101 x x x x
      U0122 x x x x
      U0155 x x x ◦
      U0402 x x x x
      U0416 x x x x
      U0423 x x x x
      Airbag sensor assembly U0073 ◦(1) x x x
      Power steering computer assembly U0100 x ◦(1) x x
      U0122 x ◦(1) x x
      U0416 x x(1) x x
      (1) DTC cannot be output in case of lost communication. In case of an open circuit in the CAN bus main line, short circuit between CAN bus lines (CAN-H and CAN-L), CAN bus +B short, or CAN bus GND short, many DTCs may be output by most ECMs (or sensors) on CAN bus or several communication error messages may be displayed on SSM3. To solve this problem, start the inspection using "Check sheet of communication for initializing.". (Refer to CHECK USING "CHECK SHEET OF COMMUNICATION FOR INITIALIZING" ), In case of either end of the CAN bus sub-line is open, irrelevant DTCs may be output (DTC may not be displayed properly) or communication error messages may be displayed on SSM3.
      Diagnosis result Description
      Source ECM DTC output Sub-lines 57-63 Ω(A/B CM system) (Refer to SUB-LINES 57-63 Ω(AIRBAG SYSTEM)  ) Sub-lines 57-63 Ω(Electric power steering system) (Refer to SUB-LINES 57-63 Ω(ELECTRIC POWER STEERING SYSTEM)  ) Sub-lines 57-63 Ω(Air conditioner amplifier assembly system) (Refer to SUB-LINES 57-63 Ω(AIR CONDITIONER CONTROL PANEL SYSTEM)  ) Sub-lines 57-63 Ω(Combination meter assembly system) (Refer to SUB-LINES 57-63 Ω(COMBINATION METER assembly SYSTEM)  )
      Air conditioner amplifier assembly U0073 x x ◦(1) x
      U0100 x x ◦(1) x
      U0101 x x ◦(1) x
      U0122 x x ◦(1) x
      U0140 x x ◦(1) x
      U0155 x x ◦(1) ◦
      U0401 x x x(1) x
      U0402 x x x(1) x
      U0416 x x x(1) x
      U0422 x x x(1) x
      U0423 x x x(1) x
      Combination meter assembly U0073 x x x ◦(1)
      U0100 x x x ◦(1)
      U0122 x x x ◦(1)
      U0131 x ◦ x ◦(1)
      U0140 x x x ◦(1)
      U0151 ◦ x x ◦(1)
      Collation ECM (Smart key computer assembly) U0073 x x x x
      U0100 x x x x
      U0101 x x x x
      U0122 x x x x
      U0140 x x x x
      U0155 x x x ◦
      U0401 x x x x
      U0422 x x x x
      Main body ECM (Multiplex network body computer) U0073 x x x x
      U0100 x x x x
      U0101 x x x x
      U0122 x x x x
      U0155 x x x ◦
      U0164 x x ◦ x
      U0327 x x x x
      U0401 x x x x
      U0402 x x x x
      U0416 x x x x
      U0423 x x x x
      U0424 x x x x
      U1201 x x x x
      (1) DTC cannot be output in case of lost communication. In case of an open circuit in the CAN bus main line, short circuit between CAN bus lines (CAN-H and CAN-L), CAN bus +B short, or CAN bus GND short, many DTCs may be output by most ECMs (or sensors) on CAN bus or several communication error messages may be displayed on SSM3. To solve this problem, start the inspection using "Check sheet of communication for initializing.". (Refer to CHECK USING "CHECK SHEET OF COMMUNICATION FOR INITIALIZING" ), In case of either end of the CAN bus sub-line is open, irrelevant DTCs may be output (DTC may not be displayed properly) or communication error messages may be displayed on SSM3.
      Diagnosis result Description
      Source ECM DTC output Sub-lines 57-63 Ω(Keyless access system) (Refer to SUB-LINES 57-63 Ω(KEYLESS ACCESS SYSTEM)  ) Sub-lines 57-63 Ω(Body integrated system) (Refer to SUB-LINES 57-63 Ω(BODY INTEGRATED UNIT SYSTEM)  )
      Transmission control computer assembly U0073 x x
      U0100 x x
      U0122 x x
      U0140 x ◦
      U0401 x x
      U0416 x x
      U0422 x x
      Brake actuator assembly U0073 x x
      U0100 x x
      U0101 x x
      U0126 x x
      Engine control computer U0073 x x
      U0101 x x
      U0122 x x
      U0155 x x
      U0402 x x
      U0416 x x
      U0423 x x
      Airbag sensor assembly U0073 x x
      Power steering computer assembly U0100 x x
      U0122 x x
      U0416 x x
      Air conditioner amplifier assembly U0073 x x
      U0100 x x
      U0101 x x
      U0122 x x
      U0140 x ◦
      U0155 x x
      U0401 x x
      U0402 x x
      U0416 x x
      U0422 x x
      U0423 x x
      Combination meter assembly U0073 x x
      U0100 x x
      U0122 x x
      U0131 x x
      U0140 x ◦
      U0151 x x
      Collation ECM (Smart key computer assembly) U0073 ◦(1) x
      U0100 ◦(1) x
      U0101 ◦(1) x
      U0122 ◦(1) x
      U0140 ◦(1) ◦
      U0155 ◦(1) x
      U0401 x(1) x
      U0422 x(1) x
      Main body ECM (Multiplex network body computer) U0073 x ◦(1)
      U0100 x ◦(1)
      U0101 x ◦(1)
      U0122 x ◦(1)
      U0155 x ◦(1)
      U0164 x ◦(1)
      U0327 ◦ ◦(1)
      U0401 x x(1)
      U0402 x x(1)
      U0416 x x(1)
      U0423 x x(1)
      U0424 x x(1)
      U1201 x x(1)
      ◦: DTC is output
      x: DTC may be output if either end of the sub-line is open
      (1) DTC cannot be output in case of lost communication
      In case of an open circuit in the CAN bus main line, short circuit between CAN bus lines (CAN-H and CAN-L), CAN bus +B short, or CAN bus GND short, many DTCs may be output by most ECMs (or sensors) on CAN bus or several communication error messages may be displayed on SSM3. To solve this problem, start the inspection using "Check sheet of communication for initializing.". (Refer to CHECK USING "CHECK SHEET OF COMMUNICATION FOR INITIALIZING"  )
      In case of either end of the CAN bus sub-line is open, irrelevant DTCs may be output (DTC may not be displayed properly) or communication error messages may be displayed on SSM3.
  12. CAN bus waveform
    Fig 4: CAN Communication Error Message (Sub-Line Is Open)
    G08552892Courtesy of SUBARU OF AMERICA, INC.
    NOTE:
    • CAN bus waveform is obtained by measuring signals between CANH-GND terminals and between CANL-GND terminals of the data link connector. (Use as a reference of the diagnostics of CAN communication line)
    • If multiple ECMs seem to be defective based on "Bus diagnosis" of SSM3 and DTC, perform resistance inspection on CAN bus (Refer to CHECK CAN COMMUNICATION CIRCUIT  ) first. If no abnormal condition is detected, then check the waveform by following the procedure described below.
    • If the waveform is similar to none of the three waveforms (Group 1), possible defects include open circuit in CAN bus main line, open circuit on either end of CAN bus sub-line, and CAN bus (CAN-H or CAN-L) shorted to GND (Group 2).
    • Check whether the waveform is disturbed when the connector and wiring harness is swayed vertically and horizontally.
    1. CAN bus waveform (Group 1)
      1. Normal waveform
        Fig 5: CAN Bus Waveform (Normal Waveform)
        G08552893Courtesy of SUBARU OF AMERICA, INC.
      2. Open circuit in both lines of one of ECM sub-lines (both CAN-H and CAN-L)
        NOTE:
        • If an ECM or sensor is connected to CAN bus sub-line with open circuit in both lines, the signal will disappear (indicated by dotted line). (the signals from other ECMs and sensors are displayed normally).
        • The waveform is similar to the normal waveform. The defective part can be identified by CAN bus check procedure.
        Fig 6: CAN Bus Waveform (CAN-H And CAN-L Are Opened)
        G08552894Courtesy of SUBARU OF AMERICA, INC.
      3. CAN bus short (CAN-H and CAN-L are shorted)
        NOTE:
        • No waveform is displayed.
        • In case of ECM internal error, the waveform will change by removing a ECM. If the waveform does not change, the wiring harness may be defective.
        Fig 7: CAN Bus Waveform (CAN-H And CAN-L Are Shorted)
        G08552895Courtesy of SUBARU OF AMERICA, INC.
    2. Example: CAN bus waveform (Group 2)
      CAUTION: The actual waveform greatly depends on the location of open or short circuit, and the waveforms is only an examples.
      1. Open circuit on either CAN bus sub-line (CAN-H)
        NOTE:
        • If an ECM is connected to CAN bus sub-line with an open circuit in either CAN-H or CAN-L, abnormal waveform is output. This defect interferes the signals from other parts, which deforms the waveform of other parts.
        • Identify the defective part by performing CAN bus check, based on DTC, or removing each ECM or sensor to observe the waveform change. If ECM or sensor with open circuit in either CAN-H or CAN-L is removed, the waveform will be identical to the one when there is an open circuit in both CAN-H and CAN-L on CAN bus sub-line.
        Fig 8: CAN Bus Waveform (Open Circuit On Either CAN Bus Sub-Line, CAN-H)
        G08552896Courtesy of SUBARU OF AMERICA, INC.
      2. Open circuit on either CAN bus sub-line (CAN-L)
        NOTE:
        • If an ECM is connected to CAN bus sub-line with an open circuit in either CAN-H or CAN-L, abnormal waveform is output. This defect interferes the signals from other parts, which deforms the waveform of other parts.
        • Identify the defective part by performing CAN bus check, based on DTC, or removing each ECM or sensor to observe the waveform change. If ECM or sensor with open circuit in either CAN-H or CAN-L is removed, the waveform will be identical to the one when there is an open circuit in both CAN-H and CAN-L on CAN bus sub-line.
        Fig 9: CAN Bus Waveform (Open Circuit On Either CAN Bus Sub-Line, CAN-L)
        G08552897Courtesy of SUBARU OF AMERICA, INC.
      3. Open circuit in CAN-H on CAN bus main line
        NOTE:
        • If an ECM or sensor is close to the data link connector in relation to the open circuit, it shows a nearly normal waveform.
        • If an ECM or sensor is on the other side of the data link connector, it shows an abnormal waveform.
        • An open circuit in CAN bus main line can be identified by measuring the resistance between CAN-H and CAN-L terminals on CAN bus sub-line (wiring harness).
        Fig 10: CAN Bus Waveform (Open Circuit In CAN-H On CAN Bus Main Line)
        G08552898Courtesy of SUBARU OF AMERICA, INC.
      4. CAN-H shorted to GND (CAN bus line)
        NOTE: In case of ECM internal error, remove an ECM one by one to check whether the waveform changes or not. If it does not change, the wiring harness may be defective.
        Fig 11: CAN Bus Waveform (CAN-H Shorted To Ground)
        G08552899Courtesy of SUBARU OF AMERICA, INC.
      5. CAN-L shorted to GND (CAN bus line)
        NOTE: In case of ECM internal error, remove an ECM one by one to check whether the waveform changes or not. If it does not change, the wiring harness may be defective.
        Fig 12: CAN Bus Waveform (CAN-L Shorted To Ground)
        G08552900Courtesy of SUBARU OF AMERICA, INC.
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