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Sentra & 200SX

  1. Turn ignition on. With fingers, pinch fuel feed hose at fuel filter. Fuel pressure pulsation should be felt for 5 seconds after ignition is turned on. If pulsation is not felt, go to next step. If pulsation is felt, system is functioning properly.
  2. Turn ignition off. Disconnect fuel pump relay. Fuel pump relay is located in relay box (behind instrument panel with 2.0L engine). Turn ignition on. Measure voltage between ground and fuel pump relay harness connector terminals No. 1 (Black/Blue wire) and No. 3 (Black/White wire). Battery voltage should be present. If battery voltage is present, go to next step. If battery voltage is not present, repair or replace fuse in main fuse box and open or short in appropriate wire between fuse and fuel pump relay.
  3. Turn ignition off. Disconnect fuel pump harness connector. Check continuity between ground and fuel pump harness connector terminal No. 2 (Black wire on 1.6L; Green/Red wire on 2.0L). Also check continuity between fuel pump harness connector terminal No. 1 (Black/Yellow wire) and fuel pump relay harness connector terminal No. 5. Continuity should exist. If continuity exists in both circuits, go to next step. If continuity does not exist in either circuit, repair open or short in appropriate wire.
  4. Disconnect PCM harness connector. Check continuity between PCM harness connector terminal No. 8 (Black/Pink wire) and fuel pump relay harness connector terminal No. 2. See Figure. Continuity should exist. If continuity exists, go to next step. If continuity does not exist, repair open or short in Black/Pink wire between PCM and fuel pump relay harness connectors.
  5. Check fuel pump relay. See RELAYS  under RELAYS & SOLENOIDS. If relay is okay, check fuel pump. See FUEL PUMP . If fuel pump relay and fuel pump are okay, check circuit harness connectors for pushed-out, bent, damaged or corroded terminals. Repair harness or connectors as necessary.
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