STEP 1. Scan tool MB991958 CAN bus diagnostics
STEP 2. Scan tool MB991958 data list
STEP 3. Scan tool MB991958 DTC of other systems
STEP 4. Check whether the DTC is reset.
(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 the DTC U0141 set?
Replace ETACS-ECU. Then go to Step 6. A poor connection, open circuit or other intermittent malfunction in the CAN bus lines between ETACS-ECU and AWD-ECU is suspected (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
STEP 5. Check whether the DTC is reset.
(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 the DTC U0141 set?
Replace AWD-ECU (Refer to ). Then go to Step 6. A poor connection, open circuit or other intermittent malfunction in the CAN bus lines between ETACS-ECU and AWD-ECU is suspected (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
STEP 6. Check whether the DTC is reset.