1996 Infiniti Q45 BaseFACTORY OEM SERVICE PROCEDURE

Fuel Pump Control System

  1. Unplug fuel pump relay. Turn ignition on. Check for battery voltage between ground and fuel pump relay connector terminal No. 2 (Black/White wire) and terminal No. 5 (Blue/Black wire).
  2. If battery voltage is present at terminals No. 2 and 5, go to next step. If battery voltage is not present, check wiring connectors and 15-amp fuse in relay block.
  3. Disconnect fuel pump harness connector. Check continuity of Orange/Blue wire between fuel pump relay and fuel pump. Check continuity of Pink/Black wire between fuel pump relay and ECM connector terminal No. 11. See Fig 1 .
  4. Repair wiring as necessary. If no faults are found in wiring, test fuel pump relay. See RELAYS  under RELAYS & SOLENOIDS. Also test fuel pump and inspect ECM connector pin terminals.
Fig 1: Identifying ECM Harness Connector Pin Terminals (Q45)
G96G10781Courtesy of NISSAN MOTOR CO., U.S.A.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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