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F-CAN Circuit Troubleshooting

  1. Turn the ignition switch to LOCK (0).
  2. Jump the SCS line with the HDS.
  3. Disconnect ECM/PCM connector A (44P), then disconnect the HDS.
  4. Measure the resistance between ECM/PCM connector terminals A36 and A37.
    Fig 1: Measuring Resistance Between ECM/PCM Connector Terminals A36 And A37
    G06950203Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 48-59 Ω? 

    YES  -Go to step  18.

    NO  -Go to step  5.

  5. Disconnect these connectors:
  6. Check for continuity between ECM/PCM connector terminals A36 and A37.
    Fig 2: Checking Continuity Between ECM/PCM Connector Terminals A36 And A37
    G06950204Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between ECM/PCM terminals A36 and A37.

    NO  -Go to step  7.

  7. Check for continuity between ECM/PCM connector terminal A36 and gauge control module 32P connector terminal No. 19.
    Fig 3: Checking Continuity Between ECM/PCM Connector Terminal A36 And Gauge Control Module 32P Connector Terminal No. 19
    G06950205Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  8.

    NO  -Repair an open in the wire between the ECM/PCM (A36) and the gauge control module.

  8. Check for continuity between ECM/PCM connector terminal A36 and VSA modulator-control unit 32P connector terminal No. 6.
    Fig 4: Checking Continuity Between ECM/PCM Connector Terminal A36 And VSA Modulator-Control Unit 32P Connector Terminal No. 6
    G06950206Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  9.

    NO  -Repair an open in the wire between the ECM/PCM (A36) and the VSA modulator-control unit.

  9. Check for continuity between ECM/PCM connector terminal A36 and motor control module (MCM) connector terminal A23.
    Fig 5: Checking Continuity Between ECM/PCM Connector Terminal A36 And Motor Control Module (MCM) Connector Terminal A23
    G06950207Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  10.

    NO  -Repair an open in the wire between the ECM/PCM (A36) and the motor control module (MCM).

  10. Check for continuity between ECM/PCM connector terminal A37 and gauge control module 32P connector terminal No. 20.
    Fig 6: Checking Continuity Between ECM/PCM Connector Terminal A37 And Gauge Control Module 32P Connector Terminal No. 20
    G06950208Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  11.

    NO  -Repair an open in the wire between the ECM/PCM (A37) and the gauge control module.

  11. Check for continuity between ECM/PCM connector terminal A37 and VSA modulator-control unit 32P connector terminal No. 5.
    Fig 7: Checking Continuity Between ECM/PCM Connector Terminal A37 And VSA Modulator-Control Unit 32P Connector Terminal No. 5
    G06950209Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  12.

    NO  -Repair an open in the wire between the ECM/PCM (A37) and the VSA modulator-control unit.

  12. Check for continuity between ECM/PCM connector terminal A37 and motor control module (MCM) connector terminal A22.
    Fig 8: Checking Continuity Between ECM/PCM Connector Terminal A37 And Motor Control Module Connector Terminal A22
    G06950210Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  13.

    NO  -Repair an open in the wire between the ECM/PCM (A37) and the motor control module (MCM).

  13. Reconnect the VSA modulator-control unit 32P connector.
  14. Measure the resistance between ECM/PCM connector terminals A36 and A37.
    Fig 9: Measuring Resistance Between ECM/PCM Connector Terminals A36 And A37
    G06950211Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 108-132 Ω? 

    YES  -Go to step  15.

    NO  -Substitute a known-good VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ), then reconnect ECM/PCM connector A (44P). If the HDS identifies the vehicle, replace the original VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ).

  15. Disconnect the VSA modulator-control unit 32P connector.
  16. Reconnect motor control module (MCM) connector A (31P).
  17. Measure the resistance between ECM/PCM connector terminals A36 and A37.
    Fig 10: Measuring Resistance Between ECM/PCM Connector Terminals A36 And A37
    G06950212Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 108-132 Ω? 

    YES  -Update the ECM/PCM if it does not have the latest software (see ELD REPLACEMENT ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then recheck. If the HDS identifies the vehicle and the ECM/PCM was updated, troubleshooting is complete. If the HDS identifies the vehicle and the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).

    NO  -Substitute a known-good motor control module (MCM) (see SUBSTITUTING THE MCM ), then reconnect ECM/PCM connector A (44P). If the HDS identifies the vehicle, replace the original motor control module (MCM) (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).

  18. Disconnect these connectors:
  19. Check for continuity between ECM/PCM connector terminal A36 and body ground.
    Fig 11: Checking Continuity Between ECM/PCM Connector Terminal A36 And Body Ground
    G06950213Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between ECM/PCM terminal A36 and the gauge control module, the VSA modulator-control unit, the yaw rate-acceleration sensor, the EPS control unit, the SRS unit, the TPMS control unit, the motor control module (MCM), or the DLC.

    NO  -Go to step  20.

  20. Check for continuity between ECM/PCM connector terminal A37 and body ground.
    Fig 12: Checking Continuity Between ECM/PCM Connector Terminal A37 And Body Ground
    G06950214Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between ECM/PCM terminal A37 and the gauge control module, the VSA modulator-control unit, the yaw rate-acceleration sensor, the EPS control unit, the SRS unit, the TPMS control unit, the motor control module (MCM), or the DLC.

    NO  -Go to step  21.

  21. Reconnect all connectors.
  22. Connect the HDS to the DLC (see GENERAL TROUBLESHOOTING INFORMATION ).
  23. Disconnect the gauge control module 32P connector.
  24. Turn the ignition switch to ON (II), and read the HDS.

    Does the HDS identify the vehicle? 

    YES  -Replace the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).

    NO  -Go to step  25.

  25. Turn the ignition switch to LOCK (0).
  26. Reconnect the gauge control module 32P connector.
  27. Disconnect the VSA modulator-control unit 32P connector.
  28. Turn the ignition switch to ON (II), and read the HDS.

    Does the HDS identify the vehicle? 

    YES  -Replace the VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION )M

    NO  -Go to step  29.

  29. Turn the ignition switch to LOCK (0).
  30. Reconnect the VSA modulator-control unit 32P connector.
  31. Disconnect the yaw rate-acceleration sensor 4P connector.
  32. Turn the ignition switch to ON (II), and read the HDS.

    Does the HDS identify the vehicle? 

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

    NO  -Go to step  33.

  33. Turn the ignition switch to LOCK (0).
  34. Reconnect the yaw rate-acceleration sensor 4P connector.
  35. Disconnect EPS control unit connector A (11P).
  36. Turn the ignition switch to ON (II), and read the HDS.

    Does the HDS identify the vehicle? 

    YES  -Replace the EPS control unit (see EPS CONTROL UNIT REMOVAL/INSTALLATION ).

    NO  -Go to step  37.

  37. Turn the ignition switch to LOCK (0).
  38. Reconnect EPS control unit connector A (11P).
  39. Disconnect SRS unit connector A (39P).
  40. Turn the ignition switch to ON (II), and read the HDS.

    Does the HDS identify the vehicle? 

    YES  -Replace the SRS unit (see SRS UNIT REPLACEMENT ).

    NO  -Go to step  41.

  41. Turn the ignition switch to LOCK (0).
  42. Reconnect SRS unit connector A (39P).
  43. Disconnect the TPMS control unit 20P connector.
  44. Turn the ignition switch to ON (II), and read the HDS.

    Does the HDS identify the vehicle? 

    YES  -Replace the TPMS control unit (see TPMS CONTROL UNIT REPLACEMENT ).

    NO  -Go to step  45.

  45. Turn the ignition switch to LOCK (0).
  46. Reconnect the TPMS control unit 20P connector.
  47. Disconnect motor control module (MCM) connector A (31P).
  48. Turn the ignition switch to ON (II), and read the HDS.

    Does the HDS identify the vehicle? 

    YES  -Replace the motor control module (MCM) (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).

    NO  -Update the ECM/PCM if it does not have the latest software (see ELD REPLACEMENT ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).

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