B1169

DTC Troubleshooting: B1168, B1169

DTC B1168: Gauge Control Module Lost Communication with the ECM/PCM (Engine Messages)

DTC B1169: Gauge Control Module Lost Communication with the PCM (A/T Messages)

1. Clear the DTCs using the HDS.

2. Turn the ignition switch to LOCK (0), and then back to ON (II).

3. Start and run the engine for at least 5 seconds then turn the engine off.

4. Check for DTCs with the HDS.

Are DTCs B1168 or B1169 indicated?
YES - Go to step 5.

NO - Intermittent failure, the F-CAN communication line is OK at this time. Check for loose or poor connections. If the connections are good, check the battery condition, Testing and Inspection and the charging system.


5. Check for DTCs with the HDS.

Is DTC B1178 also indicated at the same time?
YES - Troubleshoot DTC B1178. B1178

NO - Go to step 6.


6. Check for DTCs in the ECM/PCM with the HDS.

Are any DTCs indicated?
YES - Troubleshoot the ECM/PCM DTCs.

NO - Go to step 7.


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

8. Jump the SCS line with the HDS.

9. Disconnect the gauge control module 36P connector.

10. Disconnect ECM/PCM connector E (31P).

11. Check for continuity between gauge control module 36P connector terminals No. 28 and No. 29 and ECM/PCM connector E (31P) terminals No. 24 and No. 11 respectively.

Is there continuity?
YES - Go to step 12.

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






12. Substitute a known-good gauge control module and retest.

13. Check for DTCs with the HDS.

Are DTCs B1168 or B1169 indicated?
YES - Replace the ECM/PCM.

NO - Replace the original gauge control module.