Diagnosis Procedure

CHECK OVERALL FUNCTION
1. Turn ignition switch ON.
2. Pinch fuel feed hose (1) with two fingers.
  - : Vehicle front
  Fuel pressure pulsation should be felt on the fuel feed hose for 1 second after ignition switch is turned ON .
  
  Fig 1: Location Of Fuel Feed Hose
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  OK or NG
  
  OK: INSPECTION END
  
  NG: GO TO 2.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Turn ignition switch ON.
4. Check voltage between ECM terminal 14 and ground with CONSULT-III or tester.
Voltage: Battery voltage

Fig 2: Checking Voltage Between ECM Terminal 14 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 5.

NG: GO TO 3.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector E46.
3. Turn ignition switch ON.
4. Check voltage between IPDM E/R terminal 47 and ground with CONSULT-III or tester.
  Voltage: Battery voltage
  
  Fig 3: Checking Voltage Between IPDM E/R Terminal 47 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  OK or NG
  
  OK: GO TO 4.
  
  NG: GO TO 11.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E3, F2
- Harness for open or short between IPDM E/R and ECM
  Repair open circuit or short to ground or short to power in harness or connectors.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Disconnect "fuel level sensor unit and fuel pump" harness connector (1).
  - This illumination is shows the view with inspection hole cover removed.
4. Turn ignition switch ON.
  
  Fig 4: Location Of Fuel Level Sensor Unit And Fuel Pump Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
5. Check voltage between "fuel level sensor unit and fuel pump" terminal 1 and ground with CONSULT-III or tester.
  Voltage: Battery voltage should exist for 1 second after ignition switch is turned ON .
  
  Fig 5: Checking Voltage Between Fuel Level Sensor Unit, Fuel Pump Terminal 1 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  OK or NG
  
  OK: GO TO 9.
  
  NG: GO TO 6.
CHECK 15A FUSE
1. Turn ignition switch OFF.
2. Disconnect 15A fuse. For the fuse number, refer to "WIRING DIAGRAM ". For the fuse arrangement, refer to "IPDM E/R TERMINAL ARRANGEMENT ".
3. Check 15A fuse.
  OK or NG
  
  OK: GO TO 7.
  
  NG: Replace fuse.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-IV
1. Disconnect IPDM E/R harness connector E45.
2. Check harness continuity between IPDM E/R terminal 36 and "fuel level sensor unit and fuel pump" terminal 1. Refer to WIRING DIAGRAM .
  Continuity should exist .
3. Also check harness for short to ground and short to power.
  OK or NG
  
  OK: GO TO 11.
  
  NG: GO TO 8.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E13, B9
- Harness for open or short between IPDM E/R and "fuel level sensor unit and fuel pump"
Repair open circuit or short to ground or short to power in harness or connectors.
CHECK FUEL PUMP GROUND CIRCUIT
1. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 3 and ground.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist .
2. Also check harness for short to power.
  OK or NG
  
  OK: GO TO 10.
  
  NG: Repair or replace harness or connectors.
CHECK FUEL PUMP
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 11.

NG: Replace fuel pump. Refer to "REMOVAL AND INSTALLATION ".
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

OK or NG

OK: Replace IPDM E/R. Refer to IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) .

NG: Repair or replace harness or connectors.