Diagnostic Procedure

Check Ground Connections
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. See Figure. Refer to GROUND INSPECTION .
OK or NG
1. OK: Go to 2.
2. NG: Repair or replace ground connections.
Check DTC With Unified Meter And A/C AMP .
Refer to SELF-DIAGNOSTIC RESULTS .

OK or NG
1. OK: Go to 3.
2. NG: Go to FUEL LEVEL SENSOR SIGNAL INSPECTION .
Check Fuel Tank Temperature Sensor Power Supply Circuit
1. Turn ignition switch OFF.
2. Disconnect fuel level sensor unit and fuel pump harness connector. See Figure.
3. Turn ignition switch ON.
4. Check voltage between fuel level sensor unit and fuel pump terminal 4 and ground with CONSULT-II or tester.
  
  Fig 1: Verifying Fuel Level Sensor Unit Reference Voltage (DVOM)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Voltage: Approximately 5V
OK or NG
1. OK: Go to 5.
2. NG: Go to 4.
Detect Malfunctioning Part
Check the following.
- Harness connectors B1, M11
- Harness for open or short between ECM and fuel level sensor unit and fuel pump
1. Repair harness or connector.
Check Fuel Tank Temperature Sensor Ground Circuit For Open And Short
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. harness connector.
3. Check harness continuity between fuel level sensor unit and fuel pump terminal 5 and unified meter and A/C amp. terminal 36. Refer to wiring diagram. See Figure.
  Continuity should exist .
4. Also check harness for short to ground or short to power.
OK or NG
1. OK: Go to 7.
2. NG: Go to 6.
Detect Malfunctioning Part
Check the following.
- Harness connectors B1, M11
- Harness for open or short between fuel level sensor unit and fuel pump and unified meter and A/C amp.
1. Repair open circuit or short to ground or short to power in harness or connector.
Check Fuel Tank Temperature Sensor
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: Go to 8.
2. NG: Replace fuel level sensor unit.
Check Intermittent Incident
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. Inspection end