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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-455 DIAGNOSIS Required Special Tool: STEP 1. Using scan tool MB991502, read the diagnostic CAUTION To prevent damage to scan tool MB991502, always turn the Q: Is the DTC is output? YES : Refer to, Diagnostic Trouble Code Chart ( NO : Go to Step 2. STEP 2. Using scan tool MB991502, check actuator test. Actuator Test Reference Table ( ). a. Item 10: EGR Solenoid. (3) Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the actuator operating properly? YES : Check the following items, and repair or replace the defective items. a. Check the ignition coil, spark plugs, spark plug cables. b. Check for vacuum leaks. • Broken intake manifold gasket. • Broken or disconnected vacuum hose. • Improper operation of the PCV valve. • Broken air intake hose. Then confirm that the malfunction symptom is eliminated. NO : Repair or replace. Then confirm that the malfunction symptom is eliminated. INSPECTION PROCEDURE 14: The engine stalls when decelerating. COMMENT • The intake air volume may be insufficient due to a TROUBLESHOOTING HINTS (The most likely • Malfunction of the IAC system. DIAGNOSIS Required Special Tool: AKX01177 16 PIN MB991502 AB AKX01177 16 PIN MB991502 AB |