How to Check ECUs

HOW TO CHECK ECUs
1. Use the scan tool MB991958 (M.U.T.-III Sub Assembly) and the SWS monitor kit to check ECUs.
2. The following ECUs can be checked by using the scan tool MB991958 (M.U.T.-III Sub Assembly) and the SWS monitor kit.

NOTE: The "ECU COMM Check" function checks the communication status of ECUs. "NG" does not always mean ECU malfunction. If a malfunction is found by the "ECU COMM Check", proceed to "Symptom Procedure". Symptom Chart