Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

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 1 second after ignition switch is turned ON .

OK or NG

OK: INSPECTION END

NG: GO TO 2.

Fig 1: Identifying Oil Filler Cap Pinch Area
Courtesy of NISSAN NORTH AMERICA, INC.
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 113 and ground with CONSULT or tester.
Voltage: Battery voltage

OK or NG

OK: GO TO 5.

NG: GO TO 3.

Fig 2: Checking Voltage Between ECM Terminal 113 And Ground Using Tester
Courtesy of NISSAN NORTH AMERICA, INC.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II
Check voltage between IPDM E/R terminal 46 and ground with CONSULT or tester.

Voltage: Battery voltage

OK or NG

OK: GO TO 4.

NG: GO TO 12.

Fig 3: Checking Voltage Between IPDM E/R Terminal 46 And Ground Using Tester
Courtesy of NISSAN NORTH AMERICA, INC.
DETECT MALFUNCTIONING PART
Check harness for open or short between IPDM E/R and ECM

Repair 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.
4. Turn ignition switch ON.
  
  Fig 4: Identifying Fuel Level Sensor Unit And Fuel Pump Harness Connector
  Courtesy of NISSAN NORTH AMERICA, INC.
5. Check voltage between "fuel level sensor unit and fuel pump" terminal 1 and ground with CONSULT or tester.
  Voltage: Battery voltage should exist for 1 second after ignition switch is turned ON .
6. Also check harness for short to ground and short to power.
OK or NG

OK: GO TO 9.

NG: GO TO 6.

Fig 5: Checking Voltage Between Fuel Level Sensor Unit And Fuel Pump Harness Connector Terminal 1 And Ground Using Tester
Courtesy of NISSAN NORTH AMERICA, INC.
CHECK 15A FUSE
1. Turn ignition switch OFF.
2. Disconnect 15A fuse. For the fuse arrangement, refer to "IPDM E/R TERMINAL ARRANGEMENT ".
3. Check 15 A fuse (No. 48).
OK or NG

OK: GO TO 7.

NG: Replace fuse.
CHECK FUEL PUMP POWER SUPPLY CURCUIT-IV
1. Disconnect IPDM E/R harness connector E119.
2. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 1 and IPDM E/R terminal 13.
  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 12.

NG: GO TO 8.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors C1, E41
- Harness for open or short between "fuel level sensor unit and fuel pump" and IPDM E/R
Repair open circuit or short to ground or short to power in harness or connectors.
CHECK FUEL PUMP GROUND CIRCUIT FOR OPEN AND SHORT
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 ground.
OK or NG

OK: GO TO 11.

NG: GO TO 10.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors C1, E41
- Harness for open or short between "fuel level sensor unit and fuel pump" and ground
Repair open circuit or short to power in harness or connectors.
CHECK FUEL PUMP
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 12.

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

OK or NG

OK: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION OF IPDM E/R ".

NG: Repair or replace harness or connectors.