Diagnostic Procedure

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Use scan tool MB991958 to perform the CAN bus diagnosis.

Q: Is the check result normal?
1. YES: Go to Step 2.
2. NO: Go to "CAN Troubleshooting."
STEP 2. M.U.T.-III diagnostic trouble code
Check if the engine-related diagnostic trouble code is stored.

Q: Is the check result normal?
1. YES: Go to Step 3.
2. NO: Go to "Engine Troubleshooting."
STEP 3. Symptom recheck after erasing diagnostic trouble code
Q: Is the check result normal?
1. YES: Intermittent malfunction
2. NO: Replace TCM.