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TROUBLESHOOTING HINTS (The most likely ⦆ Malfunction of the data link connector. ⦆ Open/short circuit or poor contact in the data link ⦆ Malfunction of the CAN communication. ⦆ Malfunction of the scan tool. ⦆ Malfunction of the ECM.
DIAGNOSIS Required Special Tools: ⦆ MB991958: Scan tool (M.U.T.-III Sub Assembly) ⦆ MB991824: V.C.I. ⦆ MB991827: USB Cable STEP 1. Check the vehicle communication interface (V.C.I.) ZC501967 AC404789 ZC5019680000 MB991824 MB991827 MB991910 Data link connector (1) Connect the Scan tool to the data link connector. (2) When the power of V.C.I. is turned to ON, the indicator lamp ⦆ The indicator lamp of the V.C.I. illuminates in green. Q:Is the indicator lamp of the V.C.I. illuminates in green? YES: Go to Step 2. NO: Use scan tool, perform CAN bus line diagnosis. STEP 2. Measure the battery positive voltage. (1) Measure the battery positive voltage during cranking. ⦆ The voltage should be 8 volts or more. Q:Is the measured voltage 8 volts or more? YES: Go to Step 3. NO: Check the battery. Refer to GROUP 54A, Battery - Battery Check P.54Aa-2. Then confirm that the MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS> 13Ab-755 SYMPTOM PROCEDURES |