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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-969 . CIRCUIT OPERATION • A diagnostic output is made from the PCM (termi- nal No. 15) to the diagnostic output terminal (ter- . COMMENT • No power supply to PCM. • Defective ground circuit of PCM. • Defective PCM. • Improper communication line between PCM and scan tool. . TROUBLESHOOTING HINTS (The most likely • Malfunction of PCM power supply circuit. • Malfunction of the PCM. • Open circuit between PCM and data link connec- tor. DIAGNOSIS STEP 1. Check harness connector B-19 at PCM for Q: Is the harness connector in good condition? YES : Go to Step 2. Connector Inspection . Then confirm that the malfunction symptom is eliminated. AK303231 CONNECTOR: C-29 C-29 AB AK303153 4 3 2 1 7 6 5 9 8 11 10 14 13 12 18 17 16 15 CONNECTOR: B-19 PCM AB AIR CLEANER HARNESS CONNECTOR: B-19 (B) |