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Home >> Nissan-Datsun >> 2003 >> Sentra SE-R, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 719 (Combination Meters) >> Combination Meters >> Fuel Level Sensor Signal Inspection >> Low-Fuel Warning Lamp
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Low-Fuel Warning Lamp

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. Check Harness Connector 

    Check combination meter, fuel level sensor unit and terminals (meter-side, module-side, lead-side, and harness-side) for poor connection and bend.

    OK or NG 

    1. OK: Go to 2.
    2. NG: Repair terminal or connector.

  2. Check Harness Connector Output Signal 
    1. Disconnect fuel level sensor connector.
    2. Turn ignition switch ON.
    3. Check voltage between combination meter harness connector M41 terminal 30 (R/Y) and ground.
      Fig 1: Testing Fuel Level Sensor Reference Voltage
      G02340567Courtesy of NISSAN MOTOR CO., U.S.A.
      1. Approx. 5V 

    OK or NG 

    1. OK: Go to 3.
    2. NG: Replace combination meter.

  3. Check Harness For Open Or Short Circuit 
    1. Turn ignition switch OFF.
    2. Disconnect combination meter connector.
    3. Check continuity between combination meter harness connector M41 terminal 30 (R/Y) and fuel level sensor unit harness connector B51 terminal 5 (R/Y).
      Fig 2: Checking Continuity Combination Meter To Fuel Level Sensor
      G02340568Courtesy of NISSAN MOTOR CO., U.S.A.
      1. Continuity should exist  .
    4. Check continuity between combination meter harness connector M41 terminal 30 (R/Y) and ground.
      1. Continuity should not exist  .

    OK or NG 

    1. OK: Go to 4.
    2. NG: Repair harness or connector.

  4. Check Fuel Level Sensor Ground Circuit 
    1. Check continuity between combination meter harness connector M41 terminal 31 (B/Y) and fuel level sensor unit harness connector B51 terminal 6 (B).
      Fig 3: Checking Fuel Level Sensor Ground Circuit
      G02340569Courtesy of NISSAN MOTOR CO., U.S.A.
      1. Continuity should exist  .
    2. Check continuity between combination meter harness connector M41 terminal 31 (B/Y) and ground. See Fig 3 .
      1. Continuity should not exist  .

    OK or NG 

    1. OK: Go to 5.
    2. NG: Repair harness or connector.

  5. Check Fuel Level Sensor Unit 

    Check components. Refer to CHECK FUEL LEVEL SENSOR UNIT  .

    OK or NG 

    1. OK: Go to 6.
    2. NG: Replace fuel level sensor unit.

  6. Check Installation Condition 

    Check fuel level sensor unit installation, and check whether the float arm interferes or binds with any components inside the arm.

    OK or NG 

    1. OK: Replace combination meter.
    2. NG: Install fuel level sensor unit properly.

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