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MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L> 13B-393 CIRCUIT OPERATION • A diagnostic output is made from the PCM • When diagnostic test mode control terminal COMMENT • No power supply to PCM. • Defective ground circuit of PCM. • Defective PCM. • Improper communication line between PCM and TROUBLESHOOTING HINTS (The most likely • Malfunction of PCM power supply circuit. • Malfunction of the PCM. • Open circuit between PCM and data link DIAGNOSIS STEP 1. Check connector C-41 at PCM for damage. YES : Go to Step 2. Connector Inspection( ). Then confirm that the malfunction symptom is eliminated. AK000280 CONNECTOR : C-41 PCM AY AK000566AB CONNECTOR:C-17 AK000280 CONNECTOR : C-41 PCM AY |