Honda Accord: F-CAN Circuit Troubleshooting - PGM-FI System - Fuel and Emissions - Honda Accord MK8 2008-2012 Service ManualHonda Accord: 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 (49P)

Terminal side of female terminals


Terminal side of female terminals

Is there about 88-111 O? YES-Go to step 28.

NO-Go to step 5.

5. Disconnect these connectors:  - Gauge control module 32P (see page 22-351).

 - VSA modulator-control unit 36P (see page 19-136).

 - Yaw rate-lateral acceleration sensor 5P (see page 19-133).

 - SRS unit A (39P) (see page 24-228).

 - TPMS control unit (20P) (see page 18-83).

 -  Navigation unit B (32P) (if equipped) (see page 23-238).

6. Check for continuity between ECM/PCM connector terminals A3 and A4.

ECM/PCM CONNECTOR A (49P)

Terminal side of female terminals


Terminal side of female terminals

Is there continuity? YES

-Repair short in the wires between ECM/PCM connector 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. 30.

GAUGE CONTROL MODULE 32P CONNECTOR

Terminal side of female terminals


Terminal side of female terminals

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 36P connector terminal No. 14.

VSA MODULATOR-CONTROL UNIT 36P CONNECTOR

Terminal side of female terminals


Terminal side of female terminals

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 A4 and gauge control module 32P connector terminal No. 29

GAUGE CONTROL MOD ULE 32P CONNECTOR

Terminal side of female terminals


Terminal side of female terminals

Is there continuity? YES

-Go to step 10.

NO-

Repair open in the wire between the ECM/PCM (A4) and the gauge control module.

10, Check for continuity between ECM/PCM connector terminal A4 and VSA modulator-control unit 36P connector terminal No. 1.

VSA MODULATOR-CONTROL UNIT 36P CONNECTOR

Terminal side of female terminals


Terminal side of female terminals

Is there continuity? YES

-Go to step 11.

NO-

Repair open in the wire between the ECM/PCM (A4) and the VSA modulator-control unit.G 11. Reconnect the gauge control module 32P connector.

12. Measure the resistance between ECM/PCM connector terminals A3 and A4.

ECM/PCM CONNECTOR A (49P)

Terminal side of female terminals


Terminal side of female terminals

Is there about 2.34-2.86 kO?

YES

-Go to step 13.

NO

-Substitute a known-good gauge control module (see page 22-351), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original gauge control module (see page 22-351 ) . 13. Disconnect the gauge control module 32P connector.

14. Reconnect the VSA modulator-control unit 36P connector.

15. Measure the resistance between ECM/PCM connector terminals A3 and A4.

ECM/PCM CONNECTOR A (49P)

Terminal side of female terminals


Terminal side of female terminals

Is there about 108-132 O? YES

-Go to step 16.

NO

-Substitute a known-good VSA modulator-control unit (see page 19-136), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original VSA modulator-control unit (see page 19-136).

16. Disconnect the VSA modulator-control unit 36P connector.

17. Reconnect the yaw rate-lateral acceleration sensor 5P connector.

18. Measure the resistance between ECM/PCM connector terminals A3 and A4.

ECM/PCM CONNECTOR A (49P)

Terminal side of female terminals


Terminal side of female terminals

Is there about 2.34-2.86 kO? YES-Go to step 19.

NO-Substitute a known-good yaw rate-lateral acceleration sensor (see page 19-133), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original yaw rate-lateral acceleration sensor (see page 19-133).

19. Disconnect the yaw-rate lateral acceleration sensor 5P connector.

20. Reconnect SRS unit connector A (39P).

21. Measure the resistance between ECM/PCM connector terminals A3 and A4.

ECM/PCM CONNECTOR A (49P)

Terminal side of female terminals


Terminal side of female terminals

Is there about 2.34-2,86 kD? YES

-Go to step 22.

NO

-Substitute a known-good SRS unit (see page 24-228), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original SRS unit (see page 24-228).

22. Disconnect SRS unit connector A (39P).

23. Reconnect the TPMS control unit 20P connector.

24. Measure the resistance between ECM/PCM connector terminals A3 and A4 .

ECM/PCM CONNECTOR A (49P)

Terminal side of female terminals


Terminal side of female terminals

Is there about 2.34-2.86 kO?

YES-

- With navigation: Go to step 25.

- Without navigation: Update the ECM/PCM if it does not have the latest software (see page 11-203), or substitute a known-good ECM/PCM (see page 11-7), 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 page 11-204

NO-

Substitute a known-good TPMS control unit (see page 18-83), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original TPMS control unit (see page 18-83).

25. Disconnect the TPMS control unit 20P connector.

26. Reconnect navigation unit connector B (32P).

27. Measure the resistance between ECM/PCM connector terminals A3 and A4.

ECM/PCM CONNECTOR A (49P)

Terminal side of female terminals


Terminal side of female terminals

Is there about 2.34-2,86 kD? YES

-Update the ECM/PCM if it does not have the latest software (see page 11-203), or substitute a known-good ECM/PCM (see page 11-7), 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 page 11-204).

NO

-Substitute a known-good navigation unit (see page 23-238), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original navigation unit (see page 23-238).

28. Disconnect these connectors:  - Gauge control module 32P (see page 22-351).

 - VSA modulator-control unit 36P (see page 19-136).

 - Yaw rate-lateral acceleration sensor 5P (see page 19-133).

 -  SRS unit A (39P) (see page 24-228).

 - TPMS control unit (20P) (see page 18-83).

 -  Navigation unit B (32P) (if equipped) (see page 23-238).

29. Check for continuity between ECM/PCM connector terminal A3 and body ground.

ECM/PCM CONNECTOR A (49P)

Terminal side of female terminals


Terminal side of female terminals

Is there continuity? YES

-Repair short in the wire between the ECM/PCM (A3) and the gauge control module, the VSA modulator-control unit, the yaw rate-lateral acceleration sensor, the SRS unit, the TPMS control unit, the navigation unit, or the DLC.

NO-Go to step 30.

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

ECM/PCM CONNECTOR A (49P)

Terminal side of female terminals


Terminal side of female terminals

Is there continuity? YES

-Repair short in the wire between the ECM/PCM (A4) and the gauge control module, the VSA modulator-control unit, the yaw rate-lateral acceleration sensor, the SRS unit, the TPMS control unit, the navigation unit, or the D L C . NO

-Go to step 31.

31. Reconnect all connectors.

32. Connect the HDS to the DLC (see page 11-3).

33. Disconnect the gauge control module 32P connector.

34. Turn the ignition switch to ON (II), and read the HDS.

Does the HDS identify the vehicle? YES

-Replace the gauge control module (see page 22-351 ) . NO

-Go to step 35.

35. Turn the ignition switch to LOCK (0).

36. Reconnect the gauge control module 32P connector.

37. Disconnect the VSA modulator-control unit 36P connector.

38. 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 page 19-136).

NO

-Go to step 39.

39. Turn the ignition switch to LOCK (0).

40. Reconnect the VSA modulator-control unit 36P connector.

41. Disconnect the yaw rate-lateral acceleration sensor 5P connector.

42. 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 page 19-133).

NO

-Go to step 43.

43. Turn the ignition switch to LOCK (0).

44. Reconnect the yaw rate-lateral acceleration sensor 5P connector.

45. Disconnect SRS unit connector A (39P).

46. Turn the ignition switch to ON (II), and read the HDS.

Does the HDS identify the vehicle? YES-

Replace the SRS unit (see page 24-228).

NO

-Go to step 47.

47. Turn the ignition switch to LOCK (0).

48. Reconnect SRS unit connector A (39P).

49. Disconnect the TPMS control unit 20P connector.

50. Turn the ignition switch to ON (II), and read the HDS.

Does the HDS identify the vehicle? YES

-Replace the TPMS control unit (see page 18-83).

NO-

- With navigation: Go to step 51.

- Without navigation: Update the ECM/PCM if it does not have the latest software (see page 11-203), or substitute a known-good ECM/PCM (see page 11-7), 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 page 11-204).

51. Turn the ignition switch to LOCK (0).

52. Reconnect the TPMS control unit 20P connector.

53. Disconnect navigation unit connector B (32P).

54. Turn the ignition switch to ON (ll)f and read the HDS.

Does the HDS identify the vehicle? YES

-Replace the navigation unit (see page 23-238).

NO

-Update the ECM/PCM if it does not have the latest software (see page 11-203), or substitute a known-good ECM/PCM (see page 11-7), 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 page 11-204).

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