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Inspection Procedure 2: The malfunction indicator lamp (SERVICE ENGINE SOON or check engine lamp) remains illuminated and never goes out
 
 
 
 
COMMENT
ECM has detected failed sensor or failed actuator. Or failure is possibly caused by malfunction of combination meter.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this case:)
Combination meter failed.
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
1.STEP 1. Using scan tool (M.U.T.-III SE), read the DTC.
Use scan tool (M.U.T.-III SE) to check and see if a DTC is set in the ECM (Refer to HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES).
Q: Is any DTC set?
Perform troubleshooting for the set DTC (Refer to DIAGNOSTIC TROUBLE CODE CHART).
 
2.STEP 2. Check the malfunction symptoms.
Q: Does the malfunction symptom persist?
Check combination meter system (Refer to DRIVER INFORMATION & MULTIMEDIA, Meter, Warning Lamp & Indicator – Basic Inspection – Mater, Warning Lamp & Indicator – Diagnosis and Repair Workflow Work flow ).
Intermittent malfunction (Refer to GENERAL INFORMATION, General Information – How to Use Troubleshooting/Inspection Service Points HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).