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Home >> Infiniti >> 2009 >> FX35 AWD >> 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 and ground.
      TERMINAL VOLTAGE REFERENCE

      Terminals Voltage (Approx.)
      (+) (-)
      Unified meter and A/C amp. Ground
      Connector Terminal
      M67 42
      G05214237Courtesy of NISSAN DIESEL MOTOR CO., LTD.

      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 and fuel level sensor unit (sub) harness connector.
      TERMINAL CONTINUITY REFERENCE

      Unified meter 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 and ground.
      TERMINAL CONTINUITY REFERENCE

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

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: 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 and fuel level sensor unit and fuel pump (main) harness connector.
      TERMINAL CONTINUITY REFERENCE

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

      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) CIRCUIT

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

    TERMINAL CONTINUITY REFERENCE

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

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: 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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