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Home >> Nissan-Datsun >> 1993 >> Sentra SE-R, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Fuel Delivery >> Fuel Pump System Test (Pathfinder & Pickup)
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Fuel Pump System Test (Pathfinder & Pickup)

  1. Turn ignition on. Listen for fuel pump operating sound. Fuel pump should operate for 5 seconds after ignition is turned on. If operating sound is not heard, go to next step. If operating sound is heard, system is functioning properly.
  2. Turn ignition off. Disconnect fuel pump relay. Fuel pump relay is located in relay box on right front inner fender panel. Turn ignition on. Measure voltage between ground and fuel pump relay harness connector terminals No. 2 (Black/White wire) and No. 3 (Black/White wire). For connector identification, see Figure . Battery voltage should be present. If battery voltage is present, go to next step. If battery voltage is not present, check 10-amp fuse in main fuse box. Check harness continuity between fuse and fuel pump relay. Repair or replace as necessary.
  3. Turn ignition off. Disconnect fuel pump harness connector, located under vehicle on right frame rail. Check continuity between ground and fuel pump harness connector Black wire. Check continuity between fuel pump relay harness connector terminal No. 5 (White/Blue wire) and fuel pump harness connector White/Blue wire. Continuity should exist in both checks. If continuity exists in both checks, go to next step. If continuity does not exist in either check, repair appropriate harness or connectors.
  4. Ensure ignition is off. Disconnect ECM harness connector. ECM is located under passenger's seat. Check continuity between ECM harness connector terminal No. 104 (White/Red wire on Pickup 2.4L or Red/Blue wire on Pathfinder and Pickup 3.0L) and fuel pump relay harness connector No. 1 (White/Red wire on Pickup 2.4L or Red/Blue wire on Pathfinder and Pickup 3.0L). For terminal identification, see Figure , Figure and Figure . Continuity should exist. If continuity exists, check fuel pump relay. See RELAYS under RELAYS & SOLENOIDS  . If relay is okay, check fuel pump. See FUEL PUMP TEST. If continuity does not exist, check harness between ECM and relay. Repair harness and connectors as necessary.
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