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 FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect "fuel level sensor unit and fuel pump" harness connector.
3. Turn ignition switch ON.
  
  Fig 1: Identifying Fuel Level Sensor Unit And Fuel Pump Harness Connector
  Courtesy of NISSAN NORTH AMERICA, INC.
  
  Voltage: Approximately 5 V
4. Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with CONSULT or tester.
Fig 2: Checking Voltage Between Fuel Level Sensor Unit And Fuel Pump Terminal 4 And Ground Using Tester
Courtesy of NISSAN NORTH AMERICA, INC.

OK or NG

OK: GO TO 3.

NG: GO TO 2.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors C1, E41
- Harness for open or short between ECM and "fuel level sensor unit and fuel pump"
Repair harness or connector.
CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 3 and ground.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist .
3. Also check harness for short to power.
OK or NG

OK: GO TO 5.

NG: GO TO 4.
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 connector.
CHECK FUEL TANK TEMPERATURE SENSOR
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 6.

NG: Replace "fuel level sensor unit fuel pump". Refer to FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY .
CHECK INTERMITTENT INCIDENT
Refer to "INTERMITTENT INCIDENT ".

>> INSPECTION END