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Low-Fuel Warning Lamp

WARNING: This page is about a different car, the 2006 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

Depending on vehicle posture or driving circumstances, the fuel level in the tank varies, and the warning lamp ON timing may be changed.

  1. CHECK SELF-DIAGNOSIS 

    Perform the combination meter self-diagnosis. Refer to "SELF-DIAGNOSIS FUNCTION ".

    OK or NG 

    1. OK : GO TO 2.
    2. NG : Replace the combination meter. Refer to "COMBINATION METER ".
  2. CHECK HARNESS CONNECTOR 
    1. Turn the ignition switch OFF.
    2. Check combination meter and fuel level sensor unit and fuel pump terminals (meter-side, and harness-side) for poor connection.

    OK or NG 

    1. OK : GO TO 3.
    2. NG : Repair or replace terminals or connectors.
  3. CHECK HARNESS CONNECTOR OUTPUT SIGNAL 
    1. Disconnect fuel level sensor unit and fuel pump connector.
    2. Turn ignition switch ON.
    3. Check voltage between combination meter harness connector M24 terminal 15 and ground.

      Battery voltage should exist. 

      Fig 1: Identifying Voltage Between Combination Meter Harness Connector M24 Terminal 15 And Ground
      G04136352Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK : GO TO 4.
    2. NG : Replace the combination meter. Refer to "COMBINATION METER ".
  4. CHECK HARNESS FOR OPEN OR SHORT CIRCUIT 
    1. Turn the ignition switch OFF.
    2. Disconnect combination meter connector M24.
    3. Check continuity between combination meter harness connector M24 (B) terminal 15 and fuel level sensor unit and fuel pump harness connector C5 (A) terminal 2.

      Continuity should exist. 

    4. Check continuity between fuel level sensor unit and fuel pump harness connector C5 (A) terminal 2 and ground.

      Continuity should not exist. 

      Fig 2: Identifying Continuity Between Fuel Level Sensor Unit And Fuel Pump Harness Connector C5 Terminal 2 And Ground
      G04136353Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK : GO TO 5.
    2. NG : Repair harness or connector.
  5. CHECK FUEL LEVEL SENSOR CIRCUIT 
    1. Check continuity between combination meter harness connector M24 (B) terminal 16 and fuel level sensor unit and fuel pump harness connector C5 (A) terminal 5.

      Continuity should exist. 

    2. Check continuity between fuel level sensor unit and fuel pump harness connector C5 (A) terminal 5 and ground.

      Continuity should not exist. 

      Fig 3: Identifying Continuity Between Fuel Level Sensor Unit And Fuel Pump Harness Connector C5 Terminal 5 And Ground
      G04136354Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK : GO TO 6.
    2. NG : Repair harness or connector.
  6. CHECK FUEL LEVEL SENSOR UNIT 

    Check the fuel level sensor unit. Refer to "FUEL LEVEL SENSOR UNIT CHECK ".

    OK or NG 

    1. OK : GO TO 7.
    2. NG : Replace the fuel level sensor unit. Refer to "COMBINATION METER ".
  7. CHECK INSTALLATION CONDITION 

    Check fuel level sensor unit installation, and determine whether the float arm interferes or binds with any of the internal components in the fuel tank.

    OK or NG 

    1. OK : Replace the combination meter. Refer to "COMBINATION METER ".
    2. NG : Install the fuel level sensor unit properly.
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