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DTC U0110: F-CAN Malfunction (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 ).

    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 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 IPU COVER REMOVAL/INSTALLATION ), or substitute a known-good MCM (see SUBSTITUTING THE MCM ), then go to step  27 and recheck. If DTC U0110 is not indicated with a known-good MCM, replace the original 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 poor connections or loose terminals at MCM connector A (31P), then go to step  24.

  12. Turn the ignition switch to ON (II).
  13. Measure the voltage between MCM connector terminal A1 and body ground within 1 second.
    Fig 1: Measuring Voltage Between MCM Connector Terminal A1 And Body Ground
    G08092322Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 12 volt 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 MCM connector terminal A4 and body ground.
    Fig 2: Checking Continuity Between MCM Connector Terminal A4 And Body Ground
    G08092323Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Update the MCM if it does not have the latest software (see IPU COVER REMOVAL/INSTALLATION ), or substitute a known-good MCM (see SUBSTITUTING THE MCM ), then go to step  23 and recheck. If DTC U0110 is not indicated with a known-good MCM, replace the original MCM (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ), then go to step  23.

    NO  -Repair an open in the wire between the MCM connector (A4) and G901 (see CONNECTOR TO FUSE/RELAY BOX INDEX ), then go to step  23.

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

    Is the relay OK? 

    YES  -Go to step 19.

    NO  -Replace MCM relay 1, then go to step  24.

  19. Check the No. 42 +B IMA1 (10 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. 42 +B IMA1 (10 A) fuse and MCM relay 1. Also replace the No. 42 +B IMA1 (10 A) fuse, then go to step  24.
    • Repair a short in the wire between MCM relay 1 and the MCM. Also replace the No. 42 +B IMA1 (10 A) fuse, then go to step  24.
  20. Measure the voltage between MCM relay 1 4P connector terminal No. 2 and body ground.
    Fig 3: Measuring Voltage Between MCM Relay 1 4P Connector Terminal No. 2 And Body Ground
    G08092324Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 12 volt battery voltage? 

    YES  -Go to step 21.

    NO  -Repair an open in the wire between the No. 42 +B IMA1 (10 A) fuse and MCM relay 1, then go to step  23.

  21. Check for continuity between MCM relay 1 4P connector terminal No. 1 and MCM connector terminal A1.
    Fig 4: Checking Continuity Between MCM Relay 1 4P Connector Terminal No. 1 And MCM Connector Terminal A1
    G08092325Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 22.

    NO  -Repair an open in the wire between the MCM connector (A1) and MCM relay 1, then go to step  24.

  22. Check for continuity between MCM relay 1 4P connector terminal No. 3 and MCM connector terminal A7.
    Fig 5: Checking Continuity Between MCM Relay 1 4P Connector Terminal No. 3 And MCM Connector Terminal A7
    G08092326Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

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

    NO  -Repair an open in the wire between the MCM connector (A7) and 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) REMOVAL/INSTALLATION ).
  26. Reinstall the IPU cover (see IPU COVER REMOVAL/INSTALLATION ).
  27. Turn the battery module switch ON (see DISCONNECTING THE MOTOR POWER CABLE CONNECTOR FROM THE MOTOR STATOR ).
  28. Turn the ignition switch to ON (II).
  29. Reset the PCM with the HDS.
  30. Do the PCM idle learn procedure (see 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 MCM and the 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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