U0073
DTC U0073: F-CAN malfunction (Bus-Off)DTC U0155: F-CAN malfunction (Gauge Control Module-PCM)
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 SH-AWD control unit, the navigation unit, the adaptive cruise control (ACC) unit, the TPMS control unit, the e-pretensioner unit, and the 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 control module input test.
5. Turn the ignition switch OFF.
6. Jump the SCS line with the HDS.
7. Disconnect PCM connector E (31P).
8. Remove the gauge control module.
9. Disconnect the gauge control module 30P connector.
10. Disconnect the VSA modulator-control unit 47P connector.
11. Disconnect SH-AWD control unit connector A (26P).
12. Disconnect the navigation unit 20P connector.
13. Disconnect the adaptive cruise control (ACC) unit 20P connector.
14. Disconnect the TPMS control unit 20P connector.
15. Disconnect the E-pretensioner unit 14P connector.
16. Check for continuity between body ground and PCM connector terminals E15 and E26 individually.
Is there continuity?
YES - Repair short in the wire between the gauge control module, the VSA modulator-control unit, the navigation unit, the SH-AWD control unit, the adaptive cruise control (ACC) unit, the TPMS control unit, the e-pretensioner unit, and the PCM (E15 (E26)), then go to step 21.
NO - Go to step 17.
17. Check for continuity between PCM connector terminals E15 and E26.
Is there continuity?
YES - Repair short in the wires between the PCM E15 (CANH line) and E26 (CANL line), then go to step 21.
NO - Go to step 18.
18. Check for continuity between PCM connector terminal E15 and these connector terminals:
Is there continuity between the PCM terminal and each of the terminals in the chart?
YES - Go to step 19.
NO - Repair open in the wire between the PCM (E15) and the appropriate connector, then go to step 21.
19. Check for continuity between PCM connector terminal E26 and these connector terminals:
Is there continuity between the PCM terminal and each of the terminals in the chart?
YES - Go to step 20.
NO - Repair open in the wire between the PCM (E26) and the appropriate connector, then go to step 21.
20. Referring to the above chart. Select the row that most closely represents the combination of DTCs retrieved from the PGM-FI, VSA, TPMS, adaptive cruise control (ACC), and body electrical systems. Then check the connections at the control module indicated in the last column. If all the connections are OK, substitute the control module. After substituting the 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 21.
NO - Replace the faulty control module, then go to step 21.
21. Reconnect all connectors.
22. Turn the ignition switch ON (II).
23. Reset the PCM with the HDS.
24. Do the PCM idle learn procedure.
25. 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 SH-AWD control unit, the navigation unit, the adaptive cruise control (ACC) unit, the TPMS control unit, the e-pretensioner unit, and the 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.