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Home >> Acura >> 2011 >> TL Base >> Repair and Diagnosis >> Brakes >> Traction Control >> VSA (Vehicle Stability Assist) System Components >> DTC Troubleshooting >> DTC 86: F-CAN Communication

DTC 86: F-CAN Communication

NOTE: Troubleshoot fuel and emissions DTCs first.
  1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  2. Clear the DTC with the HDS.
  3. Start and run the engine for at least 5 seconds.
  4. Check for DTCs with the HDS.

    Is DTC 86 indicated? 

    YES  -Go to step 5.

    NO  -Check the COMMU FI ECU, COMMU A/T (AT), COMMU GAUGE, COMMU YAW RATE/G, COMMU STEERING ANGLE S (With SH-AWD), and COMMU 4WD (With SH-AWD) in the VSA FREEZE DATA with the HDS. Then check for F-CAN communication lines continuity to the appropriate system or sensor and loose terminals in the appropriate system or sensor connectors.

  5. Check the COMMU Fl ECU, COMMU ATT (A/T), COMMU GAUGE, COMMU YAW RATE/G, COMMU STEERING ANGLES (With SH-AWD), and COMMU 4WD (With SH-AWD) in the VSA DATA LIST with the HDS.

    Is there a communication error in the system or sensor? 

    YES  -Go to step 6.

    NO  -Go to step  15.

  6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  7. Short the SCS line with the HDS.
  8. Disconnect ECM/PCM connector A (49P) (see ECM/PCM REPLACEMENT ).
  9. Disconnect the VSA modulator-control unit 47P connector (see step  5 ).
  10. Disconnect the gauge control module 32P connector (see GAUGE CONTROL MODULE REPLACEMENT ).
  11. Disconnect the yaw rate-lateral acceleration sensor 4P connector (see YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT  ), or the yaw rate-lateral/longitudinal acceleration sensor 4P connector (see YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT  ).
  12. With SH-AWD: Disconnect the steering angle sensor 5P connector (see STEERING ANGLE SENSOR REPLACEMENT  ).
  13. With SH-AWD: Disconnect SH-AWD control unit connector A (20P) (see SH-AWD CONTROL UNIT REPLACEMENT ).
  14. Check the F-CAN communication lines for continuity between the VSA modulator-control unit and the appropriate system or sensor (see table).
    COMPONENT REFERENCE CHART

    Component CAN-L Terminal CAN-H Terminal
    VSA modulator-control unit No. 13 No. 12
    ECM/PCM No. A49 No. A48
    Gauge Control Module No. 9 No. 10
    Yaw Rate-lateral Acceleration Sensor or Yaw Rate-lateral/longitudinal Acceleration Sensor No. 2 No. 3
    Steering Angle Sensor (With SH-AWD) No. 2 No. 4
    SH-AWD Control Unit (With SH-AWD) No. A20 No.A10
    Fig 1: Checking Continuity Between VSA Modulator-Control Unit 47P And ECM/PCM Connector A 49P Terminals
    G06680212Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 2: Checking Continuity Between VSA Modulator-Control Unit 47P And Gauge Control Module 32P Connector Terminals
    G06680213Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 3: Checking Continuity Between VSA Modulator-Control Unit 47P And Yaw Rate-Lateral/Longitudinal Acceleration Sensor 4P Connector Terminals
    G06680214Courtesy of AMERICAN HONDA MOTOR CO., INC.

    *1: With SH-AWD: 

    With SH-AWD: 

    Fig 4: Checking Continuity Between VSA Modulator-Control Unit 47P And Steering Angle Sensor 5P Connector
    G06680215Courtesy of AMERICAN HONDA MOTOR CO., INC.

    With SH-AWD: 

    Fig 5: Checking Continuity Between VSA Modulator-Control Unit 47P And SH-AWD Control Unit Connector A 20P
    G06680216Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Do the F-CAN communication lines have continuity? 

    YES  -Go to step 15.

    NO  -Repair an open in the appropriate wire.

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

    Are the appropriate system or sensor connectors OK? 

    YES  -Go to step 16.

    NO  -Repair or reconnect the connector securely.

  16. Check for other system or sensor DTCs with the HDS.

    Are there other DTCs indicated? 

    YES  -Do the appropriate DTC troubleshooting.

    NO  -Go to step 17.

  17. 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  ).
  18. Start and run the engine for at least 5 seconds.
  19. 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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