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Home >> Chevrolet >> 2010 >> Cobalt LS, 4D Sedan, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 42 (VSA (Vehicle Stability Assist) System Components) >> DTC Troubleshooting >> DTC 86: F-CAN Communication Malfunction

DTC 86: F-CAN Communication Malfunction

WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM) ).
  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. Turn the ignition switch to LOCK (0).
  4. Start and run the engine for at least 5 seconds.
  5. Check for DTCs with the HDS.

    Is DTC 86 indicated? 

    YES  -Go to step 6.

    NO  -Check the COMMU FI ECU, COMMU CVT, COMMU GAUGE, and COMMU YAW RATE/G, in the VSA FREEZE DATA with the HDS. Then check the F-CAN communication lines for intermittent communication with the appropriate system or sensor and loose terminals in the appropriate system or sensor connectors.

  6. Check the COMMU Fl ECU, COMMU CVT, COMMU GAUGE, and COMMU YAW RATE/G, in the VSA DATA LIST with the HDS.

    Is there any communication errors in the system or sensor? 

    YES  -Go to step 7.

    NO  -Go to step  22.

  7. Turn the ignition switch to LOCK (0).
  8. Short the SCS line with the HDS.
  9. Disconnect PCM connector A (44P).
  10. Disconnect the VSA modulator-control unit 47P connector.
  11. Disconnect the gauge control module 32P connector.
  12. Disconnect the yaw rate-lateral acceleration sensor 4P connector.
  13. Check the F-CAN communication lines for continuity between the VSA modulator-control unit and the appropriate system or sensor (see table).
    COMPONENT SPECIFICATION

    Component CANL Terminal CANH Terminal
    VSA modulator-control unit 13 12
    PCM A37 A36
    Gauge Control Module 19 20
    Yaw Rate-lateral Acceleration Sensor 2 3
    Fig 1: Identifying VSA Modulator-Control Unit 47P Connector
    G06430848Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 2: Identifying VSA Modulator-Control Unit 47P Connector
    G06430849Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 3: Identifying VSA Modulator-Control Unit 47P Connector
    G06430850Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there F-CAN communication line continuity? 

    YES  -

    • If the appropriate system or sensor is the yaw rate-lateral acceleration sensor: Go to step 14.
    • If the appropriate system or sensor is not the yaw rate-lateral acceleration sensor: Go to step 18.

    NO  -Repair an open in the appropriate wire.

  14. Check for loose terminals in the appropriate system or sensor connectors.

    Are the appropriate system or sensor connectors OK? 

    YES  -Go to step 15.

    NO  -Repair or reconnect the connector securely.

  15. Turn the ignition switch to LOCK (0).
  16. Measure the voltage between yaw rate-lateral acceleration sensor 4P connector terminals No. 1 and No. 4.
    Fig 4: Measuring Voltage Between Yaw Rate-Lateral Acceleration Sensor 4P Connector Terminals No. 1 And No. 4
    G00500465Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Replace the yaw rate-lateral acceleration sensor (see YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT ).

    NO  -Go to step 17.

  17. Measure the voltage between yaw rate-lateral acceleration sensor 4P connector terminal No. 1 and body ground.
    Fig 5: Measuring Voltage Between Yaw Rate-Lateral Acceleration Sensor 4P Connector Terminals No. 1 And Body Ground
    G00500466Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Repair an open in the wire between the yaw rate-acceleration sensor and body ground (G502).

    NO  -Repair an open in the wire between the yaw rate-lateral acceleration sensor and the under-dash fuse/relay box.

  18. Check for loose terminals in the appropriate system connectors.

    Are the appropriate system connectors OK? 

    YES  -Go to step 19.

    NO  -Repair or reconnect the connector securely.

  19. Reconnect all the connectors.
  20. Start and run the engine for at least 5 seconds.
  21. Check for other system or sensor DTCs with the HDS.

    Is another DTC indicated? 

    YES  -Do the appropriate DTC troubleshooting.

    NO  -Go to step 22.

  22. Update the VSA modulator-control unit if it does not have the latest software (see VSA MODULATOR-CONTROL UNIT UPDATE ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ).
  23. Turn the ignition switch to LOCK (0).
  24. Start and run the engine for at least 5 seconds.
  25. Check for DTCs with the HDS.

    Is DTC 86 indicated? 

    YES  -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ), then retest. If the VSA modulator-control unit was substituted, Go to step  1.

    NO  -If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ). If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

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