Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Nissan Xterra. 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 Fuel Feed Hose Pinch Point
  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-III or tester.
  Voltage: Battery voltage
  
  Fig 2: Check Voltage Between ECM Terminal 113 And Ground
  Courtesy of NISSAN NORTH AMERICA, INC.
  
  OK or NG
  
  OK: GO TO 5.
  
  NG: GO TO 3.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II
Check voltage between IPDM E/R terminal 46 and ground with CONSULT-III or tester.

Fig 3: Checking Voltage Between IPDM E/R Terminal 46 And Ground
Courtesy of NISSAN NORTH AMERICA, INC.

Voltage: Battery voltage

OK or NG

OK: GO TO 4.

NG: GO TO 12.
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-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 NORTH AMERICA, INC.
6. Also check harness for short to ground and short to power.
  OK or NG
  
  OK: GO TO 9.
  
  NG: GO TO 6.
CHECK 15A FUSE
1. Turn ignition switch OFF.
2. Disconnect 15A fuse.
3. Check 15 A fuse (No. 48).
  OK or NG
  
  OK: GO TO 7.
  
  NG: Replace 15A 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.

NG: Repair or replace harness or connectors.