PGM-FI System

DTC Troubleshooting: U0155 (126-2)

DTC U0155:

F-CAN Malfunction (PCM-Gauge Control Module)

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Check for Pending or Confirmed DTCs with the HDS.

Is DTC U0155 indicated?

YES -

Go to step 4.

NO -

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module and the PCM.�

4. Check for body electrical DTCs in the DTCs MENU with the HDS.

Is DTC B1168, B1169, and/or B1178 indicated?

YES -

Go to step 5.

NO -

Do the gauge control module input test Gauge Control Module Input Test.�

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

6. Jump the SCS line with the HDS.

7. Remove the gauge control module Service and Repair, and disconnect gauge control module connector B (28P).

8. Disconnect PCM connector A (49P).

9. Check for continuity between PCM connector terminal A48 and gauge control module connector B (28P) terminal No. 16.





Is there continuity?

YES -

Go to step 10.

NO -

Repair an open in the wire between the PCM(A48) and the gauge control module, then go to step 11.

10. Check for continuity between PCM connector terminal A49 and gauge control module connector B (28P) terminal No. 15.





Is there continuity?

YES -

Substitute a known-good gauge control module Service and Repair, then go to step 11 and recheck. If DTC U0155 is not indicated after substitution, replace the original gauge control module Service and Repair, then go to step 11.

NO -

Repair an open in the wire between the PCM(A49) and the gauge control module, then go to step 11.

11. Reconnect all connectors.

12. Turn the ignition switch to ON (II).

13. Reset the PCM with the HDS.

14. Do the PCM idle learn procedure PCM Idle Learn Procedure.

15. Check for Pending or Confirmed DTCs with the HDS.

Is DTC U0155 indicated?

YES -

Check for poor connections or loose terminals at the gauge control module and the PCM, then go to step 1.

NO -

Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�