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F-CAN Circuit Troubleshooting

NOTE: Information marked with an asterisk (*) applies to the CANL line.
  1. Turn the ignition switch OFF.
  2. Jump the SCS line with the HDS.
  3. Disconnect ECM/PCM connector A (44P), then disconnect the HDS.
  4. Measure resistance between ECM/PCM connector terminals A36 and A37.
    Fig 1: Measuring Resistance Between ECM/PCM Connector Terminals A36 And A37
    G06264570Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 95-116 Ω (with ABS system) or 91-111 Ω (with VSA system)? 

    YES  -Go to step  40.

    NO  -Go to step 5.

  5. Disconnect the gauge control module (tach) 36P connector (see GAUGE CONTROL MODULE REPLACEMENT ).
  6. Disconnect the ABS modulator-control unit 25P connector (see ABS MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ) (or the VSA modulator-control unit 37P connector (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ) and the yaw rate/lateral acceleration sensor 4P connector (see YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT )).
  7. Disconnect the SRS unit 28P connector (see SRS UNIT REPLACEMENT ).
  8. Disconnect EPS control unit connector D (28P) (see EPS CONTROL UNIT REMOVAL/INSTALLATION ).
  9. Check for continuity between ECM/PCM connector terminals A36 and A37.
    Fig 2: Checking Continuity Between ECM/PCM Connector Terminals A36 And A37
    G06264571Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair short in the wires between ECM/PCM connector terminals A36 and A37*.

    NO  -Go to step 10.

  10. Connect ECM/PCM connector terminal A36 to body ground with a jumper wire.
    Fig 3: Connecting ECM/PCM Connector Terminal A36 To Body Ground With Jumper Wire
    G06264572Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Check for continuity between gauge control module (tach) 36P connector terminal No. 1 and body ground.
    Fig 4: Checking Continuity Between Gauge Control Module (TACH) 36P Connector Terminal 1 And Body Ground
    G06264573Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -

    • With ABS system: Go to step 12.
    • With VSA system: Go to step  13.

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

  12. Check for continuity between ABS modulator-control unit 25P connector terminal No, 1 and body ground.
    Fig 5: Checking Continuity Between ABS Modulator-Control Unit 25P Connector Terminal 1 And Body Ground
    G06264574Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  15.

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

  13. Check for continuity between VSA modulator-control unit 37P connector terminal No. 15 and body ground.
    Fig 6: Checking Continuity Between VSA Modulator-Control Unit 37P Connector Terminal 15 And Body Ground
    G06264575Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 14.

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

  14. Check for continuity between yaw rate-lateral acceleration sensor 5P connector terminal No. 3 and body ground.
    Fig 7: Checking Continuity Between Yaw Rate-Lateral Acceleration Sensor 5P Connector Terminal 3 And Body Ground
    G06264576Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 15.

    NO  -Repair open in the wire between the ECM/PCM (A36) and the yaw rate-lateral acceleration sensor.

  15. Check for continuity between SRS unit connector A (28P) terminal No. 11 and body ground.
    Fig 8: Checking Continuity Between SRS Unit Connector A (28P) Terminal 11 And Body Ground
    G06264577Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 16.

    NO  -Repair open in the wire between the ECM/PCM (A36) and the SRS unit.

  16. Check for continuity between EPS control unit connector D (28P) terminal No. 1 and body ground.
    Fig 9: Checking Continuity Between EPS Control Unit Connector D (28P) Terminal 1 And Body Ground
    G06264578Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 17.

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

  17. Remove the jumper wire from ECM/PCM connector A (44P).
  18. Connect ECM/PCM connector terminal A37 to body ground with a jumper wire.
    Fig 10: Connecting ECM/PCM Connector Terminal A37 To Body Ground With Jumper Wire
    G06264579Courtesy of AMERICAN HONDA MOTOR CO., INC.
  19. Check for continuity between gauge control module (tach) 36P connector terminal No. 19 and body ground.
    Fig 11: Checking Continuity Between Gauge Control Module (TACH) 36P Connector Terminal 19 And Body Ground
    G06264580Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -

    • With ABS system: Go to step 20.
    • With VSA system: Go to step  21.

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

  20. Check for continuity between ABS modulator-control unit 25P connector terminal No. 17 and body ground.
    Fig 12: Checking Continuity Between ABS Modulator-Control Unit 25P Connector Terminal 17 And Body Ground
    G06264581Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  23.

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

  21. Check for continuity between VSA modulator-control unit 37P connector terminal No. 1 and body ground.
    Fig 13: Checking Continuity Between VSA Modulator-Control Unit 37P Connector Terminal 1 And Body Ground
    G06264582Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 22.

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

  22. Check for continuity between yaw rate-lateral acceleration sensor 5P connector terminal No. 4 and body ground.
    Fig 14: Checking Continuity Between Yaw Rate-Lateral Acceleration Sensor 5P Connector Terminal 4 And Body Ground
    G06264583Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  23.

    NO  -Repair open in the wire between the ECM/PCM (A37) and the yaw rate-lateral acceleration sensor.

  23. Check for continuity between SRS unit connector A (28P) terminal No. 12 and body ground.
    Fig 15: Checking Continuity Between SRS Unit Connector A (28P) Terminal 12 And Body Ground
    G06264584Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 24.

    NO  -Repair open in the wire between the ECM/PCM (A37) and the SRS unit.

  24. Check for continuity between EPS control unit connector D (28P) terminal No. 15 and body ground.
    Fig 16: Checking Continuity Between EPS Control Unit Connector D (28P) Terminal 15 And Body Ground
    G06264585Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 25.

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

  25. Reconnect the gauge control module (tach) 36P connector.
  26. Measure resistance between ECM/PCM connector terminals A36 and A37.
    Fig 17: Measuring Resistance Between ECM/PCM Connector Terminals A36 And A37
    G06264586Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 108-132 Ω? 

    YES  -

    • With ABS system: Go to step 27.
    • With VSA system: Go to step  30.

    NO  -Substitute a known-good gauge control module (tach) (see GAUGE CONTROL MODULE REPLACEMENT ). If the HDS communicate identify the vehicle, replace the original gauge control module (tach) (see GAUGE CONTROL MODULE REPLACEMENT ).

  27. Disconnect the gauge control module (tach) 36P connector.
  28. Reconnect the ABS modulator-control unit 25P connector.
  29. Measure resistance between ECM/PCM connector terminals A36 and A37.
    Fig 18: Measuring Resistance Between ECM/PCM Connector Terminals A36 And A37
    G06264587Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 2.34-2.86 kΩ? 

    YES  -Go to step  36.

    NO  -Substitute a known-good ABS modulator-control unit (see ABS MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ). If the HDS identify the vehicle, replace the original ABS modulator-control unit (see ABS MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ).

  30. Disconnect the gauge control module (tach) 36P connector.
  31. Reconnect the VSA modulator-control unit 37P connector.
  32. Measure resistance between ECM/PCM connector terminals A36 and A37.
    Fig 19: Measuring Resistance Between ECM/PCM Connector Terminals A36 And A37
    G06264588Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 2.34-2.86 kΩ? 

    YES  -Go to step 33.

    NO  -Substitute a known-good VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ). If the HDS identify the vehicle, replace the original VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ).

  33. Disconnect the VSA modulator-control unit 37P connector.
  34. Reconnect the yaw rate-lateral acceleration sensor 5P connector.
  35. Measure resistance between ECM/PCM connector terminals A36 and A37.
    Fig 20: Measuring Resistance Between ECM/PCM Connector Terminals A36 And A37
    G06264589Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 2.34-2.86 kΩ? 

    YES  -Go to step 36.

    NO  -Substitute a known-good yaw rate-lateral acceleration sensor (see YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT ). If the HDS identify the vehicle, replace the original yaw rate-lateral acceleration sensor (see YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT ).

  36. Disconnect ABS modulator-control unit 25P connector (or the yaw rate-lateral acceleration sensor 5P connector).
  37. Reconnect the SRS unit connector A (28P).
  38. Measure resistance between ECM/PCM connector terminals A36 and A37.
    Fig 21: Measuring Resistance Between ECM/PCM Connector Terminals A36 And A37
    G06264590Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 2.34-2.86 kΩ? 

    YES  -Go to step 39.

    NO  -Substitute a known-good SRS unit (see SRS UNIT REPLACEMENT ). If the HDS identify the vehicle, replace the original SRS unit (see SRS UNIT REPLACEMENT ).

  39. Disconnect SRS unit connector A (28P).
  40. Reconnect EPS control unit connector D (28P).
  41. Measure resistance between ECM/PCM connector terminals A36 and A37.
    Fig 22: Measuring Resistance Between ECM/PCM Connector Terminals A36 And A37
    G06264591Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 2.34-2.86 kΩ? 

    YES  -Update the ECM/PCM if it does not have the latest software (see UPDATING THE ECM/PCM ), 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  ).

    NO  -Substitute a known-good EPS control unit (see EPS CONTROL UNIT REMOVAL/INSTALLATION ). If the HDS identify the vehicle, replace the original EPS control unit (see EPS CONTROL UNIT REMOVAL/INSTALLATION ).

  42. Disconnect the gauge control module (tach) 36P connector.
  43. Disconnect the ABS modulator-control unit 25P connector (or the VSA modulator-control unit 37P connector and the yaw rate-lateral acceleration sensor 5P connector).
  44. Disconnect SRS unit connector A (28P).
  45. Disconnect EPS control unit connector D (28P).
  46. Check for continuity between ECM/PCM connector terminal A36 and body ground.
    Fig 23: Checking Continuity Between ECM/PCM Connector Terminal A36 And Body Ground
    G06264592Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

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

    NO  -Go to step 47.

  47. Check for continuity between ECM/PCM connector terminal A37 and body ground.
    Fig 24: Checking Continuity Between ECM/PCM Connector Terminal A37 And Body Ground
    G06264593Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

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

    NO  -Go to step 48.

  48. Reconnect all connectors.
  49. Connect the HDS to the DLC (see GENERAL TROUBLESHOOTING INFORMATION ).
  50. Disconnect the gauge control module (tach) 36P connector.
  51. Turn the ignition switch ON (II), and read the HDS.

    Does the HDS identify the vehicle? 

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

    NO  -

    • With ABS system: Go to step 52.
    • With VSA system: Go to step  56.
  52. Turn the ignition switch OFF.
  53. Reconnect the gauge control module (tach) 36P connector.
  54. Disconnect the ABS modulator-control unit 25P connector.
  55. Turn the ignition switch ON (II), and read the HDS.

    Does the HDS identify the vehicle? 

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

    NO  -Go to step  64.

  56. Turn the ignition switch OFF.
  57. Reconnect the gauge control module (tach) 36P connector.
  58. Disconnect the VSA modulator-control unit 37P connector.
  59. Turn the ignition switch 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 60.

  60. Turn the ignition switch OFF.
  61. Reconnect the VSA modulator-control unit 37P connector.
  62. Disconnect the yaw rate-lateral acceleration sensor 5P connector.
  63. Turn the ignition switch ON (II), and read the HDS.

    Does the HDS identify the vehicle? 

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

    NO  -Go to step 64.

  64. Turn the ignition switch OFF.
  65. Reconnect the ABS modulator-control unit 25P connector (or the yaw rate-lateral acceleration sensor 4P connector).
  66. Disconnect SRS unit connector A (28P).
  67. Turn the ignition switch 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 68.

  68. Turn the ignition switch OFF.
  69. Reconnect SRS unit connector A (28P).
  70. Disconnect EPS control unit connector D (28P).
  71. Turn the ignition switch 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  -Update the ECM/PCM if it does not have the latest software (see UPDATING THE ECM/PCM ), 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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