U0104

DTC U0104: F-CAN malfunction (Adaptive Cruise Control (ACC) Unit-PCM)

NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
- If DTC U0073 is stored at the same time as DTC U0104, troubleshoot DTC U0073 first, then recheck for DTC U0104.

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 U0104 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 assembly, the adaptive cruise control (ACC) unit, and the PCM.

4. Check for a DTC in the DTCs MENU with the HDS.

Is ACC DTC 110 or 111 indicated?

YES - Go to step 5.

NO - Go to step 8.

5. Turn the ignition switch OFF.
6. Disconnect the adaptive cruise control (ACC) unit 20P connector.




7. Check for continuity between adaptive cruise control (ACC) unit 20P connector terminals No. 10 and No. 20.

Is there continuity?

YES - Substitute a known-good adaptive cruise control (ACC) unit, then go to step 15 and recheck. If DTC U0104 is not indicated, replace the original adaptive cruise control (ACC) unit, then go to step 15.

NO - Repair open in the wire between the adaptive cruise control (ACC) unit (No. 10 (No. 20)) and the PCM (E15 (E26)), then go to step 15.

8. Check for a poor connection at the adaptive cruise control (ACC) unit 20P connector.

Is the connection OK?

YES - Go to step 9.

NO - Repair the poor connection at the adaptive cruise control (ACC) unit 20P connector, then go to step 16.

9. Turn the ignition switch OFF.
10. If not already done, disconnect the adaptive cruise control (ACC) unit 20P connector.
11. Turn the ignition switch ON (II).




12. Measure voltage between adaptive cruise control (ACC) unit 20P connector terminal No. 2 and body ground.

Is there battery voltage?

YES - Go to step 13.

NO - Check the No. 29 (10 A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the No. 29 (10 A) fuse and the adaptive cruise control (ACC) unit, then go to step 15.

13. Turn the ignition switch OFF.




14. Check for continuity between adaptive cruise control (ACC) unit 20P connector terminal No. 9, No. 11, No. 12, and body ground individually.

Is there continuity?

YES - Substitute a known-good adaptive cruise control (ACC) unit, then go to step 15 and recheck. If DTC U0104 is not indicated, replace the original adaptive cruise control (ACC) unit, then go to step 15.

NO - Repair open in the wire between the adaptive cruise control (ACC) unit and G501, then go to step 15.

15. Reconnect the adaptive cruise control (ACC) unit 20P connector.
16. Turn the ignition switch ON (II).
17. Reset the PCM with the HDS.
18. Do the PCM idle learn procedure.
19. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC U0104 is indicated, check for poor connections or loose terminals at the gauge assembly, the adaptive cruise control (ACC) 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.