Diagnostic Procedure

CHECK POWER SUPPLY
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 Tank Temperature
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between terminal 2 and ground with CONSULT-II or tester.
  Voltage : Approximately 5V
OK or NG
1. OK: GO TO 3.
2. NG: GO TO 2.
Fig 2: Checking Voltage Between Terminal And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors C1, M67
- Harness connectors M81, F36
- Harness for open or short between ECM and fuel tank temperature sensor
  1. Repair harness or connector.
CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check harness continuity between terminal 4 and body ground.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
3. Also check harness for short to power.
OK or NG
1. OK: GO TO 5.
2. NG: GO TO 4.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors C1, M67
- Harness for open or short between ECM and body ground
  1. Repair open circuit or short to power in harness or connectors.
CHECK FUEL TANK TEMPERATURE SENSOR
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 6.
2. NG: Replace fuel tank temperature sensor.
CHECK INTERMITTENT INCIDENT
Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. : INSPECTION END.