STEP 1. Scan tool MB991958 CAN bus diagnostics
STEP 2. Scan tool MB991958 DTC of other systems
STEP 3. Scan tool MB991958 DTC of other systems
STEP 4. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is set.
Is DTC U0101 set?
Replace the transmission control module (Refer to GROUP 23A - transmission Control Module ). Then go to Step 6. A poor connection, open circuit or other intermittent malfunction in the CAN bus lines between the transmission control module and the AWD-ECU is suspected (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). Then go to Step 5.
STEP 5. Check whether the DTC is set again.
STEP 6. Check whether the DTC is set again.