Diagnostic Procedure

1. Turn ignition switch OFF.
2. Disconnect fuel level sensor unit and fuel pump harness connector.
3. Disconnect ECM harness connector.
4. Turn ignition switch ON.
5. Check voltage between fuel level sensor unit terminal 1 and ground, ECM terminal 46 and ground with CONSULT-II or tester.
   Fig 1: Checking Voltage Between Fuel Level Sensor Unit Terminal And Ground

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

   Voltage : Battery voltage 

OK or NG 

1. OK : GO TO  3.
2. NG : GO TO 2.

Check the following.

• Harness connectors M67, C1
• Harness connectors M81, F36
• Harness for open or short between combination meter and fuel level sensor unit
• Harness for open or short between combination meter and ECM
  1. : Repair or replace harness or connectors.

1. Turn ignition switch OFF.
2. Check harness continuity between fuel level sensor unit 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.

Check the following.

• Harness connectors M67, C1
• Harness for open or short between fuel level sensor and body ground
  1. : Repair open circuit or short to power in harness or connectors.

1. Check harness continuity between ECM terminal 46 and fuel level sensor unit terminal 1.

   Refer to WIRING DIAGRAM .

   Continuity should exist. 

2. Also check harness for short to power.

OK or NG 

1. OK : GO TO  7.
2. NG : GO TO 6.

Check the following.

• Harness connectors M81, F36
• Harness connectors M67, C1
• Harness for open or short between ECM and fuel level sensor
  1. : Repair open circuit or short to power in harness on connectors.

• Refer to "FUEL LEVEL SENSOR UNIT CHECK ".

OK or NG 

1. OK : GO TO 8.
2. NG : Replace fuel level sensor unit.

• Refer to , "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

1. : INSPECTION END.