Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Procedure
- CHECK OVERALL FUNCTION
- Turn ignition switch ON.
- Pinch fuel feed hose with two fingers.
Fuel pressure pulsation should be felt on the fuel hose for 1 second after ignition switch is turned ON.
OK or NG
OK: INSPECTION END
NG: GO TO 2.
- CHECK FUEL PUMP RELAY POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Disconnect fuel pump relay.
- Turn ignition switch ON.
- Check voltage between fuel pump relay terminals 1, 5 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG
OK: GO TO 4.
NG: GO TO 3.
- DETECT MALFUNCTIONING PART
Check the following.
- Fuse block (J/B) connector B4
- 10A fuse
- 15A fuse
- Harness for open or short between fuse and fuel pump relay
: Repair open circuit or short to ground or short to power in harness or connectors.
- CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect "fuel level sensor unit and fuel pump" harness connector.
- Check harness continuity between the following; fuel pump relay terminal 3 and fuel pump terminal 1, fuel pump terminal 3 and ground.
Refer to WIRING DIAGRAM .
Continuity should exist.
- Also check harness for short to ground and short to power.
Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
OK: GO TO 5.
NG: Repair open circuit or short to ground or short to power in harness or connectors.
- CHECK FUEL PUMP RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
- Disconnect ECM harness connector.
- Check harness continuity between ECM terminal 113 [without NVIS (NATS)] or 114 [with NVIS (NATS)] and fuel pump relay terminal 2.
Refer to WIRING DIAGRAM .
Continuity should exist.
- Also check harness for short to ground and short to power.
OK or NG
OK: GO TO 7.
NG: GO TO 6.
- DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B3, M16
- Harness connectors M58, F26
- Harness for open or short between ECM and fuel pump relay
: Repair open circuit or short to ground or short to power in harness or connectors.
- CHECK FUEL PUMP RELAY
Refer to "COMPONENT INSPECTION ".
OK or NG
OK: GO TO 8.
NG: Replace fuel pump relay.
- CHECK FUEL PUMP
Refer to "COMPONENT INSPECTION ".
OK or NG
OK: GO TO 9.
NG: Replace fuel pump.
- CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
: INSPECTION END
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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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