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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-835 . CIRCUIT OPERATION • A diagnostic output is made from the PCM (termi- nal No. 74) 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 or shorted circuit between PCM and data link connector. DIAGNOSIS STEP 1. Check harness connector D-134 at PCM for YES : Go to Step 2. Connector Inspection . Then confirm that the malfunction symptom is eliminated. AK201043 E-111 AB CONNECTOR: E-111 AK304351 D-08 CONNECTOR: D-08 AD AK201044 D-29 AB CONNECTOR: D-29 AK201166 61 62 63 64 65 66 67 68 69 70 71 76 77 78 79 85 86 87 80 72 73 74 75 81 82 83 84 88 89 CONNECTOR: D-134 AB PCM D-134(GR) HARNESS CONNECTOR: |