Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.

CHECK OVERALL FUNCTION
1. Turn ignition switch ON.
2. Pinch fuel feed hose with fingers.
  Fuel pressure pulsation should be felt on the fuel feed hose for 5 seconds after ignition switch is turned ON.
OK or NG
1. OK : INSPECTION END.
2. NG : GO TO 2.
Fig 1: Identifying Fuel Feed Hose
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK FUEL PUMP RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect fuel pump relay.
3. Turn ignition switch ON.
  
  Fig 2: Disconnecting Fuel Pump Relay
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between terminals 2, 5 and ground with CONSULT-II or tester.
  1. Voltage: Battery voltage
OK or NG
1. OK : GO TO 4.
2. NG : GO TO 3.
Fig 3: Checking Voltage Between Terminals 2, 5 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
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
  1. : Repair harness or connectors.
CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect fuel pump harness connector.
3. Check harness continuity between fuel pump terminal 2 and body ground, fuel pump terminal 1 and fuel pump relay terminal 3. Refer to WIRING DIAGRAM .
  1. 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.
Fig 4: Identifying Fuel Level Sensor Unit Harness Connector
Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M67, C1
- Harness for open or short between fuel pump and body ground
- Harness for open or short between fuel pump and fuel pump relay
  1. : 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
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 11 and fuel pump relay terminal 1. Refer to WIRING DIAGRAM .
  1. 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 M81, F36
- Harness for open or short between ECM and fuel pump relay
  1. : 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 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: Displaying "ACTIVE TEST" Mode
  Courtesy of NISSAN MOTOR CO., U.S.A.
Without CONSULT-II

Check continuity between terminals 3 and 5.

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

Fig 7: Checking Continuity Between Terminals 3 And 5
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 pump harness connector.
2. Check resistance between terminals 1 and 2.
  1. Resistance: 0.2 - 5.0Ω [at 25°C (77°F)]
OK or NG
1. OK : GO TO 10.
2. NG : Replace fuel pump.
Fig 8: Checking Resistance Between Terminals 1 And 2
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. : INSPECTION END.