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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 (49P).
  4. Measure the resistance between ECM/PCM connector terminals A3 and A4.

    ECM/PCM CONNECTOR A (43P) 

    Fig 1: Measuring Resistance Between ECM/PCM Connector Terminals A3 And A4
    G07767453Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 81-107Ω? 

    YES  -Go to step  15.

    NO  -Go to step 5.

  5. Disconnect these connectors:
  6. Check for continuity between ECM/PCM connector terminals A3 and A4.

    ECM/PCM CONNECTOR A (49P) 

    Fig 2: Checking Continuity Between ECM/PCM Connector Terminals A3 And A4
    G07767454Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair short in the wires between ECM/PCM terminals A3 and A4.

    NO  -Go to step 7.

  7. Check for continuity between ECM/PCM connector terminal A3 and gauge control module 32P connector terminal No. 22.

    GAUGE CONTROL MODULE 32P CONNECTOR 

    Fig 3: Checking Continuity Between ECM/PCM Connector Terminal A3 And Gauge Control Module 32P Connector Terminal No. 22
    G07767455Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 8.

    NO  -Repair open in the wire between the ECM/PCM (A3) and the gauge control module.

  8. Check for continuity between ECM/PCM connector terminal A3 and VSA modulator-control unit 47P connector terminal No. 12.

    VSA MODULATOR-CONTROL UNIT 47P CONNECTOR 

    Fig 4: Checking Continuity Between ECM/PCM Connector Terminal A3 And VSA Modulator-Control Unit 47P Connector Terminal No. 12
    G07767456Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 9.

    NO  -Repair open in the wire between the ECM/PCM (A3) and the VSA modulator-control unit.

  9. Check for continuity between ECM/PCM connector terminal A3 and EPS control unit connector D (28P).

    EPS CONTROL UNIT CONNECTOR D (28P) 

    Fig 5: Checking Continuity Between ECM/PCM Connector Terminal A3 And EPS Control Unit Connector D (28P)
    G07767457Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 10.

    NO  -Repair open in the wire between the ECM/PCM (A3) and the EPS control unit.

  10. Check for continuity between ECM/PCM connector terminal A4 and gauge control module 32P connector terminal No. 21.

    GAUGE CONTROL MODULE 32P CONNECTOR 

    Fig 6: Checking Continuity Between ECM/PCM Connector Terminal A4 And Gauge Control Module 32P Connector Terminal No. 21
    G07767458Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 11.

    NO  -Repair open in the wire between the ECM/PCM (A4) and the gauge control module.

  11. Check for continuity between ECM/PCM connector terminal A4 and VSA modulator-control unit 47P connector terminal No. 13.

    VSA MODULATOR-CONTROL UNIT 47P CONNECTOR 

    Fig 7: Checking Continuity Between ECM/PCM Connector Terminal A4 And VSA Modulator-Control Unit 47P Connector Terminal No. 13
    G07767459Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 12.

    NO  -Repair open in the wire between the ECM/PCM (A4) and the VSA modulator-control unit.

  12. Check for continuity between ECM/PCM connector terminal A4 and EPS control unit connector D (28P) terminal No. 15.

    EPS CONTROL UNIT CONNECTOR D (28P) 

    Fig 8: Checking Continuity Between ECM/PCM Connector Terminal A4 And EPS Control Unit Connector D (28P) Terminal No. 15
    G07767460Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 13.

    NO  -Repair open in the wire between the ECM/PCM (A4) and the EPS control unit.

  13. Reconnect the VSA modulator-control unit 47P connector.
  14. Measure the resistance between ECM/PCM connector terminals A3 and A4.

    ECM/PCM CONNECTOR A (49P) 

    Fig 9: Measuring Resistance Between ECM/PCM Connector Terminals A3 And A4
    G07767461Courtesy 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 ), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ).

  15. Disconnect these connectors:
  16. Check for continuity between ECM/PCM connector terminal A3 and body ground.

    ECM/PCM CONNECTOR A (49P) 

    Fig 10: Checking Continuity Between ECM/PCM Connector Terminal A3 And Body Ground
    G07767462Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair short in the wire between ECM/PCM terminal A3 and the gauge control module, the VSA modulator-control unit, the yaw rate-lateral acceleration sensor, the EPS control unit, the SRS unit, the TPMS control unit, the AcuraLink control unit (XM receiver) (USA model with navigation), or the DLC.

    NO  -Go to step 17.

  17. Check for continuity between ECM/PCM connector terminal A4 and body ground.

    ECM/PCM CONNECTOR A (49P) 

    Fig 11: Checking Continuity Between ECM/PCM Connector Terminal A4 And Body Ground
    G07767463Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair short in the wire between ECM/PCM terminal A4 and the gauge control module, the VSA modulator-control unit, the yaw rate-lateral acceleration sensor, the EPS control unit, the SRS unit, the TPMS control unit, the AcuraLink control unit (XM receiver) (USA model with navigation), or the DLC.

    NO  -Go to step 18.

  18. Reconnect all connectors.
  19. Connect the HDS to the DLC (see GENERAL TROUBLESHOOTING INFORMATION ).
  20. Disconnect the gauge control module 32P connector.
  21. 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 22.

  22. Turn the ignition switch to LOCK (0).
  23. Reconnect the gauge control module 32P connector.
  24. Disconnect the VSA modulator-control unit 47P connector.
  25. 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 ).

    NO  -Go to step 26.

  26. Turn the ignition switch to LOCK (0).
  27. Reconnect the VSA modulator-control unit 47P connector.
  28. Disconnect the yaw rate-lateral acceleration sensor 4P connector.
  29. Turn the ignition switch to ON (II), and read the HDS.

    Does the HDS identify the vehicle? 

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

    NO  -Go to step 30.

  30. Turn the ignition switch to LOCK (0).
  31. Reconnect the yaw rate-lateral acceleration sensor 4P connector.
  32. Disconnect EPS control unit connector D (28P).
  33. 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 34.

  34. Turn the ignition switch to LOCK (0).
  35. Reconnect EPS control unit connector D (28P).
  36. Disconnect SRS unit connector A (39P).
  37. 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 38.

  38. Turn the ignition switch to LOCK (0).
  39. Reconnect SRS unit connector A (39P).
  40. Disconnect the TPMS control unit 20P connector.
  41. 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  -

    • USA model with navigation: Go to step 42.
    • USA model without navigation, Canada model: Reconnect all connectors, and update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE ), 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 ).
  42. Turn the ignition switch to LOCK (0).
  43. Reconnect the TPMS control unit 20P connector.
  44. Disconnect AcuraLink control unit (XM receiver) connector A (32P).
  45. Turn the ignition switch to ON (II), and read the HDS.

    Does the HDS identify the vehicle? 

    YES  -Replace the AcuraLink control unit (XM receiver) (see ACURALINK CONTROL UNIT (XM RECEIVER) REMOVAL/INSTALLATION ).

    NO  -Reconnect all connectors, and update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE ), 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 ).

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