U0073

DTC U0073: F-CAN Malfunction (Bus-Off)

DTC U0155: F-CAN Malfunction (Gauge Control Module-ECM/PCM)

NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
- Information marked with an asterisk (*) applies to 2004-2005 models.
- Information marked with double asterisk (**) applies to 2006 model.

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check for Temporary DTCs or DTCs with the HDS.

Is DTC U0073 and/or 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, the VSA modulator-control unit, the navigation unit, and the ECM/PCM.

4. Check for DTCs in the DTCs MENU in the Body Electrical system with the HDS.

Is DTC B1168, B1169 and/or B1178 indicated?

YES - Go to step 5.

NO - Perform the gauge control module input test.

5. Turn the ignition switch OFF.
6. Remove the gauge control module.
7. Disconnect the gauge control module 30P* (36P)** connector.
8. Disconnect the VSA modulator-control unit 47P connector.
9. If equipped with the navigation system, disconnect the navigation unit 20P connector.
10. Jump the SCS line with the HDS.
11. Disconnect ECM/PCM connector E (31P).




12. Check for continuity between ECM/PCM connector terminals E11, E24, and body ground individually.

Is there continuity?

YES - Repair short in the wire between the gauge control module, the VSA modulator-control unit, the navigation unit, and the ECM/PCM (E11 (E24)*), then go to step 17.

NO - Go to step 13.

*: CANL line




13. Check for continuity between ECM/PCM connector terminals El 1 and E24.

Is there continuity?

YES - Repair short in the wires between ECM/PCM E11 (CANH line) and E24 (CANL line), then go to step 17.

NO - Go to step 14.




14. Check for continuity between ECM/PCM connector terminal E11 and these connector terminals:

Is there continuity between the ECM/PCM terminal and each of the terminals in the chart?

YES - Go to step 15.

NO - Repair open in the wire between the ECM/PCM and the appropriate connector, then go to step 17.




15. Check for continuity between ECM/PCM connector terminal E24 and these connector terminals:

Is there continuity between the ECM/PCM terminal and each of the terminals in the chart?

YES - Go to step 16.

NO - Repair open in the wire between the ECM/PCM and the appropriate connector, then go to step 17.




16. Using to the following chart, select the row that most closely represents the combination of DTCs retrieved from the PGM-FI, VSA, and Body Electrical systems: Check connections at the control module indicated in the last column. If all connections are OK, substitute a known-good control module, check for DTCs with the HDS.

Are the DTCs still indicated?

YES - Substitute the remaining control modules, one at time, until the DTCs are no longer present, then replace the control module that made the DTCs go away. After replacing the faulty control module, go to step 17.

NO - Replace the faulty control module, then go to step 17.

17. Reconnect all the connectors.
18. Turn the ignition switch ON (II).
19. Reset the ECM/PCM with the HDS.
20. Do the ECM/PCM idle learn procedure.
21. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC U0073 and/or U0155 is indicated, check for poor connections or loose terminals at the gauge assembly, the VSA modulator-control unit, the navigation unit, and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - Troubleshooting is complete.