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: Repair the CAN bus lines (Refer to DIAGNOSTIC TROUBLE CODE TABLE ).
STEP 2. Check other diagnostic trouble codes.
Q: Are other diagnostic trouble codes stored?
1. YES: Carry out the appropriate troubleshooting.
2. NO: Go to Step 3.
STEP 3. M.U.T.-III data list
Item 19: Secondary pressure (Refer to DATA LIST REFERENCE TABLE .)

Q: Is the check result normal?
1. YES: Intermittent malfunction
2. NO: Go to Step 4.
STEP 4. Line Pressure Check
Carry out "hydraulic test" (Refer to HYDRAULIC PRESSURE TEST ).

Q: Is the check result normal?
1. YES: Go to Step 5.
2. NO: Repair according to the hydraulic pressure test diagnosis table.
STEP 5. Symptom recheck after erasing diagnostic trouble code
Q: Is the check result normal?
1. YES: Intermittent malfunction
2. NO: Replace TCM.