Diagnostic Procedure
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- STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
Use scan tool MB991958 to perform the CAN bus diagnosis.
Q: Is the check result normal?
- YES: Go to Step 2.
- NO: Repair the CAN bus lines (Refer to DIAGNOSTIC TROUBLE CODE CHART ).
- STEP 2. Check other diagnostic trouble codes.
Q: Are other diagnostic trouble codes set?
- YES: Carry out the appropriate troubleshooting.
- NO: Go to Step 3.
- STEP 3. Scan tool data list
Item 19: Secondary pressure (Refer to DATA LIST REFERENCE TABLE .)
Q: Is the check result normal?
- YES: Intermittent malfunction
- 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?
- YES: Go to Step 5.
- NO: Repair according to the hydraulic pressure test diagnostic trouble table.
- STEP 5. Symptom recheck after erasing diagnostic trouble code
Q: Is the check result normal?
- YES: Intermittent malfunction
- NO: Replace TCM.