PCM-Gauge Control Module

DTC Troubleshooting: U0155 (PGM-FI System)

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), or press the engine start/stop button to select the ON mode.

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 U0029 and/or U0100 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), or press the engine start/stop button to select the OFF mode.

6. Jump the SCS line with the HDS.

7. Remove the gauge control module. Service and Repair

8. Disconnect the gauge control module 32P connector.

9. Disconnect PCM connector A (49P).

10. Connect gauge control module 32P connector terminal No. 10 to body ground with a jumper wire.






11. Check for continuity between PCM connector terminal A48 and body ground.

Is there continuity?
YES - Go to step 12.

NO - Repair open in the wire between the PCM (A48) and the gauge control module, then go to step 14.






12. Connect gauge control module 32P connector terminal No. 9 to body ground with a jumper wire.






13. Check for continuity between PCM connector terminal A49 and body ground.

Is there continuity?
YES - Substitute a known-good gauge control module, Service and Repair then go to step 14 and recheck. If DTC U0155 is not indicated after substitution, replace the original gauge control module, then go to step 14.

NO - Repair open in the wire between the PCM (A49) and the gauge control module, then go to step 14.






14. Reconnect all connectors.

15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

16. Reset the PCM with the HDS.

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

18. 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.