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MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L> 13B-425 TROUBLESHOOTING HINTS (The most likely • Malfunction of the IAC system. • Malfunction of the throttle body. 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 output? YES : Refer to, Diagnostic Trouble Code Chart( ). NO : Go to Step 2. STEP 2. Check the idle air control (IAC) motor operation ° C (68 ° F) or below. NOTE: If necessary, you can disconnect the engine coolant ° C (68 ° F) or below. (2) Check that the operation sound of the IAC motor can be heard after the ignition is switched to the "ON" position (but • An operation sound should be heard. (3) Turn the ignition switch to the "LOCK" (OFF) position. Q: Did you hear the operation sound? YES : Go to Step 3. − Idle Control System RPM Lower Than Expected( ), DTC P0507 − Idle Control System RPM Higher Than Expected ( AC003081 AB 16 PIN MB991502 ACX02523AG IDLE AIR |