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DTC U0114: F-CAN Malfunction (PCM-VTM-4 Control Unit)

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 U0029 is stored at the same time as DTC U0114, troubleshoot DTC U0029 first, then recheck for DTC U0114.
  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.

    Is DTC U0114 indicated? 

    YES  -Go to step 4.

    NO  -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the VTM-4 control unit and the PCM.

  4. Check for communication to the VTM-4 system with the HDS.

    Does the HDS communicate with the VTM-4 control unit? 

    YES  -Go to step 5.

    NO  -Go to the VTM-4 symptom troubleshooting for VTM-4 indicator does not go off, and no DTCs are stored (see SYMPTOM TROUBLESHOOTING ).

  5. Turn the ignition switch to LOCK (0).
  6. Jump the SCS line with the HDS.
  7. Disconnect PCM connector A (49P).
  8. Disconnect VTM-4 control unit connector A (22P).
  9. Check for continuity between PCM connector terminal A48(A49)* and VTM-4 control unit connector terminal A11 (A22)* individually.

    *: CANL line

    Fig 1: Checking Continuity Between PCM Connector Terminal A48 (A49) And VTM-4 Control Unit Connector Terminal A11 (A22)
    G08079148Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Substitute a known-good VTM-4 control unit (see VTM-4 CONTROL UNIT REPLACEMENT ), then go to step 10 and recheck. If DTC U0114 is not indicated, replace the original VTM-4 control unit (see VTM-4 CONTROL UNIT REPLACEMENT ), then go to step 10.

    NO  -Repair an open in the wire between the VTM-4 control unit (A11 (A22)*) and the PCM (A48 (A49)*), then go to step 10.

  10. Reconnect all connectors.
  11. Turn the ignition switch to ON (II).
  12. Reset the PCM with the HDS.
  13. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  14. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC U0114 indicated? 

    YES  -Check for poor connections or loose terminals at the VTM-4 control unit 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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