2000 Infiniti QX4FACTORY OEM SERVICE PROCEDURE

Fuel Pump Control System

  1. On Quest, check inertia fuel shutoff switch located behind left kick panel. If switch has been triggered, push reset button. If switch has not been triggered, go to next step.
  2. On all models, turn ignition on. Pinch fuel hose with fingers. Pulsation should be felt on fuel hose for 5 seconds after ignition is turned on (one second on Maxima). If pulsation is felt, system is okay. If pulsation is not felt, go to next step.
  3. Turn ignition off. Disconnect fuel pump relay harness connector. For location, see ECCS, PCM & FUEL PUMP RELAY LOCATIONS  table under RELAYS & SOLENOIDS. Turn ignition on. Measure voltage between ground and fuel pump relay harness connector power supply terminals. See FUEL PUMP RELAY CIRCUIT IDENTIFICATION  table. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit. See appropriate wiring diagram in WIRING DIAGRAMS article.
  4. Turn ignition off. Disconnect fuel pump harness connector. For location, see FUEL PUMP HARNESS CONNECTOR LOCATIONS  table under FUEL PUMP. On Maxima, disconnect dropping resistor harness connector located in trunk. See Fig 1. On Quest, disconnect fuel pump and fuel temperature sensor harness connector located behind fuel tank. See Fig 2. On all models, check continuity of fuel pump ground circuit. See FUEL PUMP CIRCUIT IDENTIFICATION  table. If continuity exists, go to next step. If continuity does not exist, repair open ground circuit.
    Fig 1: Locating Fuel Pump Control Module (FPCM) & Dropping Resistor (Maxima)
    G99J54824Courtesy 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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