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Low-Fuel Warning Lamp

WARNING: This page is about a different car, the 2002 Infiniti Q45. 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. SELF-DIAGNOSIS INSPECTION 

    Preform the combination meter self-diagnosis mode. Refer to METER/GAUGES OPERATION, ODO/TRIP METER AND A/T INDICATOR  .

    OK or NG 

    1. OK >> GO TO 2.
    2. NG >> Replace unified meter control unit (sub).
  2. HARNESS CONNECTOR INSPECTION 
    1. Turn the ignition switch OFF.
    2. 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 3.
    2. NG >> Repair or replace terminals or connectors.
  3. CHECK HARNESS CONNECTOR OUTPUT SIGNAL 
    1. Check voltage between combination meter harness connector M42 terminal 30 (R/L) and ground.
      1. Approx. 5V

    OK or NG 

    1. OK >> GO TO 4.
    2. NG >> Replace unified meter control unit (sub).
      Fig 1: Checking Harness Connector Output Signal
      G02031108Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK HARNESS FOR OPEN OR SHORT 
    1. Disconnect combination meter connector and fuel level sensor unit connector.
    2. Check the following.
      • Continuity between combination meter harness connector M42 terminal 30 (R/L) and fuel level sensor unit harness connector B239 terminal 5 (R/L).
      • Check for continuity between combination meter harness connector M42 terminal 29 (B/Y) and the fuel level sensor unit harness connector terminal 6 (B).
      1. Continuity should exist.
      Fig 2: Checking Harness For Open Or Short
      G02031109Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK >> GO TO 5.
    2. NG >> Repair or replace harnesses or connectors.
  5. FUEL LEVEL SENSOR UNIT INSPECTION 

    Check the components. Refer to FUEL LEVEL SENSOR UNIT CHECK  .

    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 unified meter control unit (sub).
    2. NG >> Install fuel level sensor unit properly.
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