U0073
DTC U0073: F-CAN Malfunction (BUS-OFF) (2006 model)DTC U0155: F-CAN Malfunction (Gauge Control Module-ECM/PCM) (2006 model)
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
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, system is OK at this time. Check for poor connections or loose terminals at the gauge control module, the VSA modulator-control unit, the TPMS control unit, the navigation unit, and the ECM/PCM.
4. Check for DTCs in the body electrical system DTCs menu with the HDS.
Is DTC B1168, B1169, and/or B1178 indicated?
YES - Go to step 5.
NO - Do the gauge self-diagnostic function.
5. Turn the ignition switch OFF.
6. Remove the gauge control module.
7. Disconnect the gauge control module 30P connector.
8. Disconnect the VSA modulator-control unit 47P connector.
9. Disconnect the TPMS control unit 20P connector.
10. If equipped with navigation system, disconnect the navigation unit 20P connector.
11. Jump the SCS line with the HDS.
12. Disconnect ECM/PCM connector E (31P).
13. Check for continuity between ECM/PCM connector terminals E15, E26, and body ground individually.
*: CANL line
Is there continuity?
YES - Repair short in the wire between the gauge control module, the VSA modulator-control unit, the TPMS control unit, the navigation unit, and the ECM/PCM (E15 (E26)* ), then go to step 18.
NO - Go to step 14.
14. Check for continuity between ECM/PCM connector terminals E15 and E26.
*: CANL line
Is there continuity?
YES - Repair short in the wire between the ECM/PCM E15 (CANL line) and E26 (CANL line), then go to step 18.
NO - Go to step 15.
15. Check for continuity between ECM/PCM connector terminal E15 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 18.
16. Check for continuity between ECM/PCM connector terminal E26 and these connector terminals:
Is there continuity between the ECM/PCM terminal and each of the terminals in the chart?
YES - Go to step 17.
NO - Repair open in the wire between the ECM/PCM and the appropriate connector, then go to step 18.
17. Using the following chart, select the row that most closely represents the combination of DTCs retrieved from the PGM-FI, VSA, TPMS, and Body Electrical systems: Check connections at the control module indicated in the last column. If all the connections are OK, substitute another control module. After substituting the control module, go to step 18 and recheck.
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 18,
NO - Replace the faulty control module, then go to step 18.
18. Reconnect all the connectors.
19. Turn the ignition switch ON (II).
20. Reset the ECM/PCM with the HDS.
21. Do the ECM/PCM idle learn procedure.
22. 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 TPMS 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.