How to Check ECUs

HOW TO CHECK ECUs
1. Use the scan tool MB991958 (MUT-III Sub Assembly) and the SWS monitor kit to check ECUs. (Refer to MUT-III Operating Instructions)




2. The following ECUs can be checked by using the scan tool and the SWS monitor kit.

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