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Home >> Infiniti >> 2012 >> M37 x >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter, Warning Lamp & Indicator >> DTC/Circuit Diagnosis >> Fuel Level Sensor Signal Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK COMBINATION METER INPUT SIGNAL 
    1. Turn ignition switch ON.
    2. Check voltage between combination meter harness connector and ground.
      Terminals Voltage (Approx.)
      (+) (-)
      Combination meter Ground
      Connector Terminal
      M53 34
      G07022233

      Does it match fuel gauge reading? 

      YES: GO TO 2.

      NO: Replace the combination meter. Refer to "REMOVAL AND INSTALLATION ".

  2. CHECK FUEL LEVEL SENSOR UNIT (SUB) CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect combination meter connector and fuel level sensor unit (sub) connector.
    3. Check continuity between combination meter harness connector and fuel level sensor unit (sub) harness connector.
      Combination meter Fuel level sensor unit (sub) Continuity
      Connector Terminal Connector Terminal
      M53 34 B21 1 Existed
    4. Check continuity between combination meter harness connector and ground.
      Combination meter Ground Continuity
      Connector Terminal
      M53 34 Not existed

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair harness or connector.

  3. CHECK FUEL LEVEL SENSOR (SUB-MAIN) CIRCUIT 
    1. Disconnect fuel level sensor unit (main) connector.
    2. Check continuity between fuel level sensor unit (sub) harness connector and fuel level sensor unit (main) harness connector.
      Fuel level sensor unit (sub) Fuel level sensor unit (main) Continuity
      Connector Terminal Connector Terminal
      B21 2 B241 2 Existed
    3. Check continuity between fuel level sensor unit (main) harness connector and ground.
      Fuel level sensor unit (sub) Ground Continuity
      Connector Terminal
      B21 2 Not existed

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Repair harness or connector.

  4. CHECK FUEL LEVEL SENSOR (MAIN) GROUND CIRCUIT 

    Check continuity between fuel level sensor unit (main) harness connector and combination meter harness connector.

    Fuel level sensor unit (main) Combination meter Continuity
    Connector Terminal Connector Terminal
    B241 5 M53 24 Existed

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Repair harness or connector.