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Home >> Infiniti >> 2008 >> G37 Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter, Warning Lamp & Indicator >> Component Diagnosis >> Fuel Level Sensor Signal Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK UNIFIED METER AND A/C AMP. INPUT SIGNAL
    1. Turn ignition switch ON.
    2. Check voltage between unified meter and A/C amp. harness connector terminal and ground.
    TERMINAL VOLTAGE CHART

    Terminal Voltage (Approx.)
    (+) (-)
    Unified meter and A/C amp.
    Connector Terminal
    M67 42 Ground
    G05223669Courtesy of NISSAN MOTOR CO., U.S.A.

    Does it match fuel gauge reading? 

    YES: GO TO  2.

    NO: Replace the unified meter and A/C amp.

  2. CHECK FUEL LEVEL SENSOR (SUB) CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect unified meter and A/C amp. connector and fuel level sensor unit (sub) connector.
    3. Check continuity between unified meter and A/C amp. harness connector terminal and fuel level sensor unit (sub) harness connector terminal.
      CONNECTOR TERMINAL CONTINUITY CHART

      Unified meter and A/C amp. Fuel level sensor unit (sub) Continuity
      Connector Terminal Connector Terminal
      M67 42 B21 1 Existed
    4. Check continuity between unified meter and A/C amp. harness connector terminal and ground.
      CONNECTOR TERMINAL CONTINUITY CHART

      Unified meter and A/C amp. Ground Continuity
      Connector Terminal
      M67 42 Not existed

      Is the inspection result normal? 

      OK: GO TO  3.

      NG: Repair harness or connector.

  3. CHECK FUEL LEVEL SENSOR (MAIN-SUB) CIRCUIT
    1. Disconnect fuel level sensor unit and fuel pump (main) connector.
    2. Check continuity between fuel level sensor unit (sub) harness connector terminal and fuel level sensor unit and fuel pump (main) harness connector terminal.
      CONNECTOR TERMINAL CONTINUITY CHART

      Fuel level sensor unit (sub) Fuel level sensor unit (main) Continuity
      Connector Terminal Connector Terminal
      B21 2 B22 2 Existed
    3. Check continuity between fuel level sensor unit (sub) harness connector terminal and ground.
    CONNECTOR TERMINAL CONTINUITY CHART

    Fuel level sensor unit (sub) Ground Continuity
    Connector Terminal
    B21 2 Not existed

    Is the inspection result normal? 

    OK: GO TO  4.

    NG: Repair harness or connector.

  4. CHECK FUEL LEVEL SENSOR (MAIN) CIRCUIT

    Check continuity between fuel level sensor unit and fuel pump (main) harness connector terminal and unified meter and A/C amp. harness connector terminal.

    CONNECTOR TERMINAL CONTINUITY CHART

    Fuel level sensor unit (main) Unified meter and A/C amp. Continuity
    Connector Terminal Connector Terminal
    B22 5 M67 58 Existed

    Is the inspection result normal? 

    OK: GO TO  5.

    NG: Repair harness or connector.

  5. CHECK INSTALLATION CONDITION

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

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Install the fuel level sensor unit properly.

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