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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 U0110: F-CAN Malfunction (ECM/PCM-MCM)

DTC U0110: F-CAN Malfunction (ECM/PCM-MCM)

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. Check for Pending or Confirmed DTCs with the HDS.

    Are DTC U0029 and U0110 indicated at the same time? 

    YES  -Go to the troubleshooting for DTC U0029 (see DTC U0029: F-CAN MALFUNCTION (BUS-OFF (ECM/PCM))  ).

    NO  -Go to step  4.

  4. Clear the DTC with the HDS.
  5. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC U0110 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 Pending or Confirmed DTCs with the HDS again.

    Are DTC U0110 and U1205 indicated at the same time? 

    YES  -Go to step  7.

    NO  -Update the motor control module (MCM) if it does not have the latest software (see MOTOR CONTROL MODULE (MCM) UPDATE ), or substitute a known-good motor control module (MCM) (see SUBSTITUTING THE MCM ), then go to step  27 and recheck. If DTC U0110 is not indicated with a known-good motor control module (MCM), replace the original motor control module (MCM) (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ), then go to step  27.

  7. Turn the ignition switch to LOCK (0).
  8. Turn the battery module switch OFF.
  9. Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION ).
  10. Remove the PCU lid, the PCU busplate, and the PCU cover (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).
  11. Check for poor connections or loose terminals at motor control module (MCM) connector A (31P).

    Are the connections and the terminals OK? 

    YES  -Go to step  12.

    NO  -Repair the connections or the terminals, then go to step  24.

  12. Turn the ignition switch to ON (II).
  13. Measure the voltage between motor control module (MCM) connector terminal A9 and body ground within 1 second.
    Fig 1: Measuring Voltage Between Motor Control Module (MCM) Connector Terminal A9 And Body Ground
    G06950194Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 12V battery voltage? 

    YES  -Go to step  14.

    NO  -Go to step  16.

  14. Turn the ignition switch to LOCK (0).
  15. Check for continuity between motor control module (MCM) connector terminal A6 and body ground.
    Fig 2: Checking Continuity Between Motor Control Module (MCM) Connector Terminal A6 And Body Ground
    G06950195Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Update the motor control module (MCM) if it does not have the latest software (see MOTOR CONTROL MODULE (MCM) UPDATE ), or substitute a known-good motor control module (MCM) (see SUBSTITUTING THE MCM ), then go to step  24 and recheck. If DTC U0110 is not indicated with a known-good motor control module (MCM), replace the original motor control module (MCM) (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ), then go to step  24.

    NO  -Repair an open in the wire between the motor control module (MCM) (A6) and G901 (see IMA MOTOR POWER CABLE (CARGO AREA BRANCH) (IA) ), then go to step  24.

  16. Turn the ignition switch to LOCK (0).
  17. Remove the motor control module (MCM) relay 1.
  18. Test motor control module (MCM) relay 1 (see POWER RELAY TEST ).

    Is the relay OK? 

    YES  -Go to step  19.

    NO  -Replace motor control module (MCM) relay 1, then go to step  24.

  19. Check the No. B42 +B IMA1 (7.5 A) fuse in the under-dash fuse/relay box.

    Is the fuse OK? 

    YES  -Go to step  20.

    NO  -

    • Repair a short in the wire between the No. B42 +B IMA1 (7.5 A) fuse and motor control module (MCM) relay 1. Also replace the No. B42 +B IMA1 (7.5 A) fuse, then go to step  24.
    • Repair a short in the wire between the motor control module (MCM) relay 1 and the motor control module (MCM). Also replace the No. B42 +B IMA1 (7.5 A) fuse, then go to step  24.
  20. Measure the voltage between rear relay block 8P connector (motor control module (MCM) relay 1) terminal No. 6 and body ground.
    Fig 3: Measuring Voltage Between Rear Relay Block 8P Connector (Motor Control Module (MCM) Relay 1) Terminal No. 6 And Body Ground
    G06950196Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  21.

    NO  -Repair an open in the wire between the No. B42 +B IMA1 (7.5 A) fuse and motor control module (MCM) relay 1, then go to step  23.

  21. Check for continuity between rear relay block 8P connector (motor control module (MCM) relay 1) terminal No. 5 and motor control module (MCM) connector terminal A9.
    Fig 4: Checking Continuity Between Rear Relay Block 8P Connector (MCM Relay 1) Terminal No. 5 And Motor Control Module Connector Terminal A9
    G06950197Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  22.

    NO  -Repair an open in the wire between the motor control module (MCM) (A9) and motor control module (MCM) relay 1, then go to step  24.

  22. Check for continuity between rear relay block 8P connector (motor control module (MCM) relay 1) terminal No. 8 and motor control module (MCM) connector terminal A3.
    Fig 5: Checking Continuity Between Rear Relay Block 8P Connector (MCM Relay 1) Terminal No. 8 And Motor Control Module Connector Terminal A3
    G06950198Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Update the motor control module (MCM) if it does not have the latest software (see MOTOR CONTROL MODULE (MCM) UPDATE ), or substitute a known-good motor control module (MCM) (see SUBSTITUTING THE MCM ), then go to step  24 and recheck. If DTC U0110 is not indicated with a known-good motor control module (MCM), replace the original motor control module (MCM) (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ), then go to step  24.

    NO  -Repair an open in the wire between the motor control module (MCM) (A3) and motor control module (MCM) relay 1, then go to step  24.

  23. Turn the ignition switch to LOCK (0).
  24. Reconnect all connectors.
  25. Reinstall the PCU cover, the PCU busplate, and the PCU lid (see MOTOR CONTROL MODULE (MCM) UPDATE ).
  26. Reinstall the IPU cover (see IPU COVER REMOVAL/INSTALLATION ).
  27. Turn the battery module switch ON (see DISCONNECTING THE IMA MOTOR POWER CABLE CONNECTOR FROM THE MOTOR STATOR ).
  28. Turn the ignition switch to ON (II).
  29. Reset the ECM/PCM with the HDS.
  30. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  31. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC U0110 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 .

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