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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 118 (Engine Controls - System & Component Testing) >> Fuel System >> Fuel Delivery >> Fuel Pump Control System (Sentra 2.5L)
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Fuel Pump Control System (Sentra 2.5L)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 Nissan Xterra, 2003 Nissan Sentra, 2003 Nissan Pathfinder, 2003 Nissan Murano, and 2003 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition on. Pinch supply fuel hose with fingers. Pulsation should be felt on fuel hose for 5 seconds after ignition is turned on. If pulsation is felt, system is okay. If pulsation is not felt, go to next step.
  2. Turn ignition off. Disconnect fuel pump relay harness connector. Fuel pump relay is located behind left kick panel. See Fig 1. Turn ignition on. Measure voltage between ground and fuel pump relay harness connector terminals No. 1 (Black/Red wire). If battery voltage does not exist, go to next step. If battery voltage exists, leave harness connector disconnected and go to step  4.
  3. Check the following:
    • Check fuse block fuse No. 17 (10-amp).
    • Check for open or short in Black/Red wire between fuel pump relay and fuse block. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
    If problem is found, repair as necessary. After repair, retest system.
  4. Measure voltage between ground and fuel pump relay terminal No. 5 (Black/White wire). If battery voltage does not exist, go to next step. If battery voltage exists, go to step  9.
  5. Check the following:
    • Check fuse block fuse No. 29 (15-amp).
    • Check for open or short in Black/White wire between fuel pump relay and fuse block. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
    If problem is found, repair as necessary. After repair, retest system.
  6. Turn ignition off. Disconnect fuel pump harness connector located behind access cover, under rear seat. Check continuity between ground and fuel pump harness connector terminal No. 3 (Black wire). See Fig 2. Check continuity in Black/Yellow wire between fuel pump harness connector terminal No. 1 and fuel pump relay harness connector terminal No. 3. Continuity should exist at both measurements. Also, check circuits for short to ground or short to voltage. If problem is found, go to next step. If no problem is found, go to step  8.
  7. Check the following:
    • Check for open or short in Black wire between ground and fuel pump. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
    • Check for open or short in Black/Yellow wire between fuel pump and fuel pump relay.
    If problem is found, repair as necessary. After repair, retest system.
  8. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location, see Figure. Check continuity of Black/Pink wire between fuel pump relay harness connector terminal No. 2 and ECM harness connector terminal No. 10 (without NVIS) or No. 29 (with NVIS). See Figure. Also, check circuit for short to ground or short to voltage. If problem is found, go to next step. If no problem is found, go to step  10.
  9. Check the following:
    • Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors B3 and M16. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
    • Check for poor, loose, corroded or damaged terminal connections at in-line harness connectors M58 and F26.
    • Check for open or short in circuits between ECM and fuel pump relay.
    If problem is found, repair as necessary. After repair, retest system.
  10. Working with fuel pump relay, apply battery voltage and ground to terminals No. 1 and 2. When battery voltage is applied, continuity should exist between terminals No. 3 and 5. When battery voltage is removed, continuity should not exist. Replace relay, if test values are not as specified. If relay tests okay, go to next step.
  11. Check fuel pump. See FUEL PUMP . If problem is found, replace as necessary. If fuel pump is okay, go to next step.
  12. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
Fig 1: Locating Fuel Pump Relay & Defogger Relay (Sentra)
G00015120Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Identifying Fuel Pump Assembly Harness Connector Terminals (Sentra)
G99A52795Courtesy of NISSAN MOTOR CO., U.S.A.
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