Diagnostic Procedure

CHECK OVERALL FUNCTION
1. Turn ignition switch ON.
2. Pinch fuel feed hose with two fingers.
  Fuel pressure pulsation should be felt on the fuel feed hose for 5 seconds after ignition switch is turned ON.
  
  Fig 1: Identifying Fuel Feed Hose
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: INSPECTION END
2. NG: GO TO 2.
CHECK POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect fuel pump relay.
  
  Fig 2: Identifying Fuel Pump Relay
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Turn ignition switch ON.
4. Check voltage between terminals 2, 5 and ground with CONSULT-II or tester.
  
  Fig 3: Checking Voltage Between Terminals And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Voltage : Battery voltage
OK or NG
1. OK: GO TO 4.
2. NG: GO TO 3.
DETECT MALFUNCTIONING PART
Check the following.
- Fuse block (J/B) connector M31
- 15A fuse
- Harness for open or short between fuse and fuel pump relay
  Repair harness or connectors.
CHECK POWER GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect "fuel level sensor unit and fuel pump" harness connector.
  
  Fig 4: Identifying Fuel Level Sensor Unit And Fuel Pump Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  NOTE: For fuel pump harness connector terminal identification, refer to Fig 8
3. Check harness continuity between fuel pump terminal 6 and body ground, fuel pump terminal 5 and fuel pump relay terminal 3.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 6.
2. NG: GO TO 5.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors C1, M67
- Harness for open or short between fuel pump and body ground
- Harness for open or short between fuel pump and fuel pump relay
  Repair open circuit or short to ground or short to power in harness or connectors.
CHECK OUTPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 11 and fuel pump relay terminal 1.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 8.
2. NG: GO TO 7.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors F36, M81
- 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
With CONSULT-II
1. Reconnect fuel pump relay, "fuel level sensor unit and fuel pump" harness connector and ECM harness connector.
2. Turn ignition switch ON.
3. Turn fuel pump relay "ON" and "OFF" in "ACTIVE TEST" mode with CONSULT-II and check operating sound.
  
  Fig 5: Scan Tool Display - Active Test
  Courtesy of NISSAN MOTOR CO., U.S.A.
Without CONSULT-II

Check continuity between terminals 3 and 5.

Fig 6: Continuity Condition Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 7: Identifying Fuel Pump Relay Terminals
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 9.
2. NG: Replace fuel pump relay.
CHECK FUEL PUMP
1. Disconnect "fuel level sensor and fuel pump" harness connector.
  
  Fig 8: Identifying Fuel Level Sensor And Fuel Pump Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check resistance between terminals 5 and 6.
  Resistance : 0.2 - 5.0Ω [at 25°C (77°F)]
OK or NG
1. OK: GO TO 10.
2. NG: Replace fuel pump.
CHECK INTERMITTENT INCIDENT
Perform , "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

INSPECTION END