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DTC 86-16: F-CAN Communication With VTM-4 Control Unit 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 86-16 indicated? 

    YES  -If DTC 86-11 is indicated at the same time, do the DTC 86-11 troubleshooting first (see DTC 86-11: F-CAN BUS-OFF MALFUNCTION  ). If DTC 86-11 is not indicated, go to step 5.

    NO  -If any other DTCs are indicated, go to the indicated DTCS TROUBLESHOOTING . If DTCs are not indicated, intermittent failure, the system is OK at this time. Refer to INTERMITTENT FAILURES TROUBLESHOOTING  .

  5. Turn the ignition switch to LOCK (0) and then back to ON (II).

    Do the VTM-4 indicator come on then go off? 

    YES  -Go to step 6.

    NO  -Do the VTM-4 system troubleshooting (see GENERAL TROUBLESHOOTING INFORMATION ).

  6. Turn the ignition switch to LOCK (0).
  7. Disconnect VTM-4 control unit 22P connector A (see VTM-4 CONTROL UNIT 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 the VSA modulator-control unit 36P connector terminal and VTM-4 control unit connector A (22P) terminal (see table).
    VSA MODULATOR-CONTROL UNIT 36P CONNECTOR TERMINAL AND VTM-4 CONTROL UNIT CONNECTOR A (22P) TERMINAL

    Sign VSA Modulator-Control Unit 36P Connector Terminal VTM-4 Control Unit Connector A (22P) Terminal
    CAN-L No. 1 No. 22
    CAN-H No. 14 No. 11
    Fig 1: Checking Continuity Between VSA Modulator-Control Unit 36P Connector Terminal And VTM-4 Control Unit Connector A (22P) Terminal
    G08088454Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Check for loose terminals in VTM-4 control unit connector A (22P). If necessary, substitute a known-good VTM-4 control unit (see VTM-4 CONTROL UNIT REPLACEMENT ), then go to step  1 and recheck. If no DTCs are indicated, replace the original VTM-4 control unit (see VTM-4 CONTROL UNIT REPLACEMENT ). If DTC 86-16 resets, go to step 10.

    NO  -Repair an open in the wire between the VTM-4 control unit 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 86-16 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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