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Home >> Infiniti >> 1994 >> Q45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Fuel Delivery >> Fuel Pump Control System Wiring
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Fuel Pump Control System Wiring

  1. Unplug fuel pump relay. Turn ignition on. Check for battery voltage at fuel pump relay connector terminals No. 1 (Blue/Black wire) and No. 5 (Black/White wire). See Figure . If battery voltage is present at terminals No. 1 and 5, go to next step. If battery voltage is not present, check wiring connectors and 15-amp fuse in relay block.
  2. Disconnect fuel pump harness connector and fuel pump control unit harness connector. Check continuity of Orange/Blue wire between fuel pump relay, fuel pump and fuel pump control unit. Check continuity of Green/Orange wire between fuel pump control unit and ECM connector terminal No. 6. See Figure . Check continuity of Pink/Black wire between fuel pump relay and ECM connector terminal No. 18. Check continuity of Pink/Blue wire between fuel pump control unit and ECM connector terminal No. 19. Repair wiring as necessary.
  3. If no faults are found in wiring, test fuel pump relay. See RELAYS  under RELAYS & SOLENOIDS. Also test fuel pump, fuel pump control unit and inspect ECM connector pin terminals.
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