Diagnostic Procedure

CHECK COMBINATION METER FUNCTION
Refer to "COMBINATION METERS ".

OK or NG
1. OK: GO TO 2.
2. NG: Go to "FUEL LEVEL SENSOR UNIT INSPECTION ".
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION ".
  
  Fig 1: Checking Ground Connections
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 3.
2. NG: Repair or replace ground connections.
CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Disconnect "fuel level sensor unit and fuel pump" harness connector.
2. Turn ignition switch ON.
  
  Fig 2: Locating Fuel Level Sensor Unit And Fuel Pump Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with CONSULT-II or tester.
  1. Voltage: Approximately 5V
  Fig 3: Checking Voltage Between Fuel Level Sensor Unit, Fuel Pump Terminal 4 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 3.
2. NG: GO TO 4.
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"
  1. Repair harness or connector.
- CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
  1. Turn ignition switch OFF.
  2. Disconnect combination meter harness connector.
  3. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 3 and combination meter terminal 16. Refer to WIRING DIAGRAM .
    1. Continuity should exist.
  4. Also check harness for short to ground and short to power.
  OK or NG
  1. OK: GO TO 5.
  2. NG: GO TO 6.
- DETECT MALFUNCTIONING PART
  Check the following.
  - Harness connectors C1, E41
  - Harness connectors E152, M31
  - Harness for open or short between "fuel level sensor unit and fuel pump" and combination meter
    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 and fuel pump".
- CHECK INTERMITTENT INCIDENT
  Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
  1. : INSPECTION END