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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-657 STEP 7. Measure the power supply voltage at PCM 28, No. 29 and ground by backprobing. • The voltage is 1 volt or lower for approximately 3 sec- onds, then changes to the battery positive voltage when (3) Turn the ignition switch to the "LOCK" (OFF) position. YES : Go to Step 10. STEP 8. Check connector C-89 at PCM for damage. YES : Go to Step 9. Connector Inspection . Then go to Step 14. AK103914 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 20 30 21 22 23 24 25 26 27 28 29 31 32 33 34 35 1 10 AB CONNECTOR: C-89 C-89(GR) HARNESS CONNECTOR: AKX01550 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 C-89 HARNESS CONNECTOR: AF 9 AK103914 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 20 30 21 22 23 24 25 26 27 28 29 31 32 33 34 35 1 10 AB CONNECTOR: C-89 C-89(GR) HARNESS CONNECTOR: |