1993 Nissan-Datsun Maxima SE, Standard, RS5F50VFACTORY OEM SERVICE PROCEDURE

Fuel Pump System Test (300ZX)

  1. With connector connected, measure voltage between ground and fuel pump harness connector terminal "a" (Orange wire). Refer to Fig 1 . Connector is located under rear seat. Turn ignition on. Battery voltage should be present for one second after ignition is turned on. If voltage is as specified, go to step 3). If voltage is not as specified, go to next step.
  2. Turn ignition off. Check Green fusible link located in fusible link holder next to battery. Check harness continuity between battery positive terminal and fuel pump relay (White/Black wire). Check harness continuity between fuel pump relay and fuel pump (Orange wire). Check harness continuity between fuel pump relay and ECM harness connector terminal No. 18 (Black/Pink wire). Continuity should exist in all checks. If continuity does not exist, repair appropriate harness or connector. If continuity exists, check fuel pump relay. See RELAYS  under RELAYS & SOLENOIDS.
  3. Measure voltage between ground and fuel pump harness connector terminal "b". See Fig 1 . Start engine. Battery voltage should be present for 30 seconds after starting engine. After 30 seconds, voltage should be 3-6 volts with engine idling. If voltage is as specified, system is functioning properly. If voltage is not as specified, go to next step.
  4. Check harness continuity between fuel pump and fuel pump control module (White wire). Fuel pump control module is located behind trim panel next to left rear seat. Check harness continuity between ECM harness connector terminal No. 104 (Black/Pink wire) and fuel pump control module. See Figure and Figure . Continuity should exist in all checks. If continuity does not exist, repair appropriate harness or connector. If continuity exists, check fuel pump. See FUEL PUMP TEST.
Fig 1: Testing Fuel Pump System (300ZX)
G93J79615Courtesy 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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