STEP 1. Using scan tool MB991958, diagnose the CAN bus diagnostics
STEP 2. DTC recheck after resetting CAN bus lines
(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 U1073 set?
Go to Step 3. This diagnosis is complete.
STEP 3. 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 U1073 set?
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS ).Then go to Step 4. Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
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 U1073 set?
Return to Step 1. This diagnosis is complete.