Diagnostic Procedure

CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch "OFF".
2. Disconnect fuel level sensor unit harness connector.
  
  Fig 1: Disconnecting Fuel Level Sensor Unit Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Turn ignition switch "ON".
4. Check voltage between fuel level sensor unit terminal 1 and ground with CONSULT-II or tester.
  
  Fig 2: Checking Voltage Between Fuel Level Sensor Unit Terminal 1 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Voltage: Approximately 5V
OK or NG
1. OK GO TO 3 .
2. NG GO TO 2.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B1, M2
- Harness connectors M94, F27
- Harness for open or short between ECM and fuel level sensor unit
1. 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 terminal 2 and combination meter terminal 23. Refer to WIRING DIAGRAM .
  Continuity should exist.
3. Also check harness for short to ground or short to power.
OK or NG
1. OK GO TO 5 .
2. NG GO TO 4.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B1, M2
- Harness for open or short between ECM and fuel level sensor unit
1. Repair open circuit or short to ground or short to power in harness or connectors.
CHECK FUEL TANK TEMPERATURE SENSOR
1. Remove fuel level sensor unit.
2. Check resistance between fuel level sensor unit terminals 1 and 2 by heating with hot water or heat gun as shown in the figure.
Fig 3: Checking Resistance Between Fuel Level Sensor Unit Terminals 1 And 2 By Heating With Hot Water
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK GO TO 6.
2. NG Replace fuel level sensor unit.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT " .
1. INSPECTION END