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Home >> Honda >> 2013 >> CR-Z Base, Automatic CVT Trans >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Communication Systems (F-Can, IMA-Can, K-Line) >> DTC Troubleshooting >> DTC U0038: IMA-CAN Malfunction (BUS-OFF); DTC U1205: IMA-CAN Malfunction (ECM/PCM-Motor Control Module (MCM))

DTC U0038: IMA-CAN Malfunction (BUS-OFF); DTC U1205: IMA-CAN Malfunction (ECM/PCM-Motor Control Module (MCM))

NOTE:
  • Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  • If DTC U0110 is stored at the same time as DTC U0038/U1205, troubleshoot that DTC first, then recheck for DTC U0038/U1205.
  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. Turn the ignition switch to LOCK (0).
  4. Turn the ignition switch to ON (II).
  5. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC U0038 or U1205 indicated? 

    YES  -Go to step  6.

    NO  -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the motor control module (MCM) and the ECM/PCM.

  6. Check for DTCs in the IMA system with the HDS.

    Is DTC U0038 or U1205 indicated? 

    YES  -Go to step  7.

    NO  -Go to step  38.

  7. Turn the ignition switch to LOCK (0).
  8. Jump the SCS line with the HDS.
  9. Disconnect ECM/PCM connector A (44P).
  10. Measure the resistance between ECM/PCM connector terminals A38 and A39.
    Fig 1: Measuring Resistance Between ECM/PCM Connector Terminals A38 And A39
    G06950187Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 108-132 Ω? 

    YES  -Go to step  22.

    NO  -

    • More than 132 Ω: Go to step  11.
    • Less than 108 Ω: Go to step  17.
  11. Turn the battery module switch OFF.
  12. Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION ).
  13. Remove the PCU lid, the PCU busplate, and the PCU cover (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).
  14. Disconnect motor control module (MCM) connector A (31P).
  15. Measure the resistance between ECM/PCM connector terminals A38 and motor control module (MCM) connector terminal A2.
    Fig 2: Measuring Resistance Between ECM/PCM Connector Terminals A38 And Motor Control Module (MCM) Connector Terminal A2
    G06950188Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 1.0 Ω or less? 

    YES  -Go to step  16.

    NO  -Repair an open in the wire between the ECM/PCM (A38) and the motor control module (MCM) (A2), then go to step  33.

  16. Measure the resistance between ECM/PCM connector terminals A39 and motor control module (MCM) connector terminal A1.
    Fig 3: Measuring Resistance Between ECM/PCM Connector Terminals A39 And Motor Control Module (MCM) Connector Terminal A1
    G06950189Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 1.0 Ω or less? 

    YES  -Replace the motor control module (MCM) (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ), then go to step  33.

    NO  -Repair an open in the wire between the ECM/PCM (A39) and the motor control module (MCM) (A1), then go to step  33.

  17. Turn the battery module switch OFF.
  18. Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION ).
  19. Remove the PCU lid, the PCU busplate, and the PCU cover (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).
  20. Disconnect motor control module (MCM) connector A (31P).
  21. Measure the resistance between ECM/PCM connector terminals A38 and A39.
    Fig 4: Measuring Resistance Between ECM/PCM Connector Terminals A38 And A39
    G06950190Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 1.0 Ω or more? 

    YES  -Replace the motor control module (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ), then go to step  33.

    NO  -Repair a short in the wires between the ECM/PCM (A38) (IMA-CAN H line) arid the ECM/PCM (A39) (IMA-CAN L line), then go to step  33.

  22. Turn the battery module switch OFF.
  23. Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION ).
  24. Remove the PCU lid, the PCU busplate, and the PCU cover (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).
  25. Disconnect motor control module (MCM) connector A (31P).
  26. Measure the resistance between body ground and ECM/PCM connector terminals A38 and A39 individually.
    Fig 5: Measuring Resistance Between Body Ground And ECM/PCM Connector Terminals A38 And A39
    G06950191Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 1.0 Ω or more? 

    YES  -Go to step  27.

    NO  -Repair a short to ground in the wire between the ECM/PCM (A38) and the motor control module (MCM) (A2) or between the ECM/PCM (A39) the and the motor control module (MCM) (A1), then go to step  33.

  27. Turn the ignition switch to ON (II).
  28. Measure the voltage between body ground and ECM/PCM connector terminals A38 and A39 individually.
    Fig 6: Measuring Voltage Between Body Ground And ECM/PCM Connector Terminals A38 And A39
    G06950192Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there voltage? 

    YES  -Repair a short to power in the wire between the ECM/PCM (A38) and the motor control module (MCM) (A2) or between the ECM/PCM (A39) and the motor control module (MCM) (A1), then go to step  32.

    NO  -Go to step  29.

  29. Turn the ignition switch to LOCK (0).
  30. Reconnect ECM/PCM connector A (44P).
  31. Measure the resistance between motor control module (MCM) connector terminals A1 and A2.
    Fig 7: Measuring Resistance Between Motor Control Module (MCM) Connector Terminals A1 And A2
    G06950193Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 108-132 Ω? 

    YES  -Go to step  36.

    NO  -Replace the ECM/PCM (see ECM/PCM REPLACEMENT ), then go to step  33.

  32. Turn the ignition switch to LOCK (0).
  33. Reconnect all connectors.
  34. Turn the ignition switch to ON (II).
  35. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC U0038 or DTC U1205 indicated? 

    YES  -Check for poor connections or loose terminals at the motor control module (MCM) and the ECM/PCM, then go to step  1.

    NO  -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC'S TROUBLESHOOTING .

  36. Reconnect all connectors.
  37. Turn the ignition switch to ON (II).
  38. Update the ECM/PCM if it does not have the latest software (see ELD REPLACEMENT ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ).
  39. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC U0038 or DTC U1205 indicated? 

    YES  -Check for poor connections or loose terminals at the motor control module (MCM), and ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then recheck. If the ECM/PCM was substituted, go to step  1.

    NO  -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC'S TROUBLESHOOTING .

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