Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body.

   Refer to "GROUND INSPECTION ".

   Fig 1: Locating Three Ground Screws On Body

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

OK or NG 

1. OK: GO TO 2.
2. NG: Repair or replace ground connections.

1. Disconnect "fuel level sensor unit and fuel pump" harness connector.
2. Turn ignition switch ON.
   Fig 2: Disconnecting 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 

OK or NG 

1. OK: GO TO  4.
2. NG: GO TO 3.

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

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

Check the following.

• Harness connectors B211, M141
• Harness connectors M135, F105
• Harness for open or short between ECM and "fuel level sensor unit and fuel pump"
  1. Repair open circuit or short to ground or short to power in harness or connector.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 2 and ECM terminal 67.

   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  6.
2. NG: GO TO 5.

Check the following.

• Harness connectors B211, M141
• Harness connectors M135, F105
• Harness for open or short between ECM and "fuel level sensor unit and fuel pump"
  1. Repair open circuit or short to ground or short to power in harness or connector.

Refer to "COMPONENT INSPECTION ".

OK or NG 

1. OK: GO TO 7.
2. NG: Replace fuel level sensor unit.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

1. INSPECTION END