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DTC 86-11: F-CAN Bus-Off Malfunction

NOTE:
  • Troubleshoot any fuel and emissions DTCs first.
  • 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. Turn the ignition switch to LOCK (0) and then back to ON (II).
  4. Check for DTCs with the HDS.

    Is DTC 86-11 indicated? 

    YES  -Go to step 5.

    NO  -Intermittent failure, the system is OK at this time. Refer to INTERMITTENT FAILURES TROUBLESHOOTING  .

  5. Turn the ignition switch to LOCK (0).
  6. Short the SCS line with the HDS.
  7. Disconnect PCM connector A (49P) (see PCM REPLACEMENT ).
  8. Disconnect the VSA modulator-control unit 36P connector (see step  4 under VSA Modulator-Control Unit Removal and Installation ).
  9. Check for continuity between VSA modulator-control unit 36P connector terminal and PCM connector A (49P) terminal (see table).
    VSA MODULATOR-CONTROL UNIT 36P CONNECTOR TERMINAL AND PCM CONNECTOR A (49P) TERMINAL

    Sign VSA Modulator-Control Unit 36P Connector Terminal PCM Connector A (49P) Terminal
    CAN-L No. 1 No. 49
    CAN-H No. 14 No. 48
    Fig 1: Checking Continuity Between VSA Modulator-Control Unit 36P Connector Terminal And PCM Connector A (49P) Terminal
    G08088448Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 10.

    NO  -Repair an open in the wire between the PCM and the VSA modulator-control unit.

  10. Reconnect all connectors.
  11. Update the VSA modulator-control unit if it does not have the latest software (see VSA MODULATOR-CONTROL UNIT UPDATE  ).
  12. Turn the ignition switch to LOCK(0) and then back to ON (II).
  13. Check for DTCs with the HDS.

    Is DTC 86-11 indicated? 

    YES  -Check for loose terminals in the VSA modulator-control unit 36P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION  ).

    NO  -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCS TROUBLESHOOTING .

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