Diagnosis Procedure

1. CHECK GROUND CONNECTIONS
   1. Turn ignition switch OFF.
   2. Loosen and retighten ground screws on the body.

   Refer to "GROUND INSPECTION ".

   Fig 1: Location Of Washer Tank, Fuse And Fusible Link Box And Body Ground E15

   Courtesy of NISSAN MOTOR CO., U.S.A.

   OK or NG 

   OK: GO TO 2.

   NG: Repair or replace ground connections.

2. CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
   1. Turn ignition switch OFF.
   2. Disconnect "fuel level sensor unit and fuel pump" harness connector (1).
      1. : Vehicle front
   3. Turn ignition switch ON.
      Fig 2: Identifying Fuel Level Sensor Unit And Fuel Pump Harness Connector

      Courtesy of NISSAN MOTOR CO., U.S.A.
   4. Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with CONSULT-III or tester.

   Voltage: Approximately 5 V 

   Fig 3: Checking Voltage Between Fuel Level Sensor Unit And Fuel Pump Terminal 4 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

   OK or NG 

   OK: GO TO  4.

   NG: GO TO 3.

3. DETECT MALFUNCTIONING PART

   Check the following.

   • Harness connectors B9, E13
   • Harness for open or short between ECM and "fuel level sensor unit and fuel pump"

   Repair open circuit or short to ground or short to power in harness or connector.

4. 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 5 and combination meter terminal 4, ECM terminal 104. Refer to WIRING DIAGRAM .

      Continuity should exist  .

   4. Also check harness for short to ground and short to power.

   OK or NG 

   OK: GO TO  6.

   NG: GO TO 5.

5. DETECT MALFUNCTIONING PART

   Check the following.

   • Harness connectors B8, M8
   • Harness connectors B9, E13
   • Harness for open or short between "fuel level sensor unit and fuel pump" and combination meter.
   • Harness for open or short between "fuel level sensor unit and fuel pump" and ECM.

   Repair open circuit or short to ground or short to power in harness or connectors.

6. CHECK FUEL TANK TEMPERATURE SENSOR

   Refer to, "COMPONENT INSPECTION ".

   OK or NG 

   OK: GO TO 7.

   NG: Replace "fuel level sensor unit and fuel pump". Refer to "REMOVAL AND INSTALLATION ".

7. CHECK INTERMITTENT INCIDENT

Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

INSPECTION END