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 second after ignition switch is turned ON .
OK or NG
1. OK: INSPECTION END
2. NG: GO TO 2.
  
  Fig 1: Pinching 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: Identifying Fuel Pump Relay
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between fuel pump relay terminals 2, 3 and ground with CONSULT-II or tester.
  Voltage: Battery voltage
OK or NG
1. OK: GO TO 4.
2. NG: GO TO 3.
  
  Fig 3: Checking Voltage Between Fuel Pump Relay Terminals 2, 3 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Fuse block (J/B) No. 1 connector M1
- Fuse block (J/B) No. 2 connectors M143, M145
- 15A fuses
- Harness for open or short between fuse and fuel pump relay
  1. : 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
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.
3. Disconnect dropping resistor harness connector.
  
  Fig 5: Identifying Dropping Resistor Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check harness continuity between the following; fuel pump relay terminal 5 and fuel pump terminal 3, fuel pump terminal 1 and dropping resistor terminal 2, dropping resistor terminal 1 and ground.
  Refer to Wiring Diagram .
  
  Continuity should exist .
5. 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 B211, M141
- Harness connectors B63, B263
- Fuse block (J/B) No. 2 connector M143
- Harness for open or short between fuel pump relay and fuel pump
- Harness for open or short between fuel pump and dropping resistor
- Harness for open or short between dropping resistor and ground
  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 113 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
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M135, F105
- Fuse block (J/B) No. 2 connector M143
- 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 DROPPING RESISTOR
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK: GO TO 9.
2. NG: Replace dropping resistor.
CHECK FUEL PUMP RELAY
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK: GO TO 10.
2. NG: Replace fuel pump relay.
CHECK FUEL PUMP
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK: GO TO 11.
2. NG: Replace fuel pump.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. : INSPECTION END