DTC U0104: F-CAN Malfunction (ACC Unit-ECM/PCM) NOTE: 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).

1. Clear the DTC with the HDS.

1. 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 ACC unit and the ECM/PCM.■

1. Check for DTCs in the DTCs MENU of the DRIVER SUPPORT SYSTEM with the HDS.

Is driver support system's DTC 60 indicated?

YES | - | Go to Step 5 .
NO | - | Go to Step 8 .

1. Turn the ignition switch OFF.

1. Disconnect the ACC unit 20P connector.

1. Check for continuity between ACC unit 20P connector terminals No. 10 and No. 20.

Is there continuity?

YES | - | Substitute a known-good ACC unit, then go to Step 15 and recheck. If no DTCs are indicated, replace the original ACC unit, then go to Step 15 .
NO | - | Repair open in the wire between the ACC unit (No. 10, No. 20) and the ECM/PCM (E11, E24), then go to Step 15 .

1. Check for a poor connections at the ACC unit 20P connector.

Are the connections OK?

YES | - | Go to Step 9 .
NO | - | Repair the poor connection at the ACC unit 20P connector, then go to Step 15 .

1. Turn the ignition switch OFF.

1. Disconnect the ACC unit 20P connector.

1. Turn the ignition switch ON (II).