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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-839 • Defective malfunction indicator lamp (service engine soon or check engine lamp) circuit. • Connector damage. • Malfunction of the PCM. DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: V.C.I. • MB991827: USB Cable • MB991911: Main Harness B STEP 1. Using scan tool MB991958, check data list item 16: CAUTION To prevent damage to scan tool MB991958, always turn the 16, Power Supply Voltage. • Voltage should be battery positive voltage. (4) Turn the ignition switch to the "LOCK" (OFF) position. present? − Power Supply System and Ignition Switch-IG System STEP 2. Check the burned-out bulb. YES : Go to step 3. symptom is eliminated. AK302970 AB MB991911 MB991824 MB991827 |