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Home >> Infiniti >> 2018 >> Q70 5.6 Luxe, RWD >> Repair and Diagnosis >> Electrical >> Gauges >> Meter, Warning Lamp Indicator (DTC/Circuit Diagnosis) (Except Hybrid) >> DTC/Circuit Diagnosis >> Fuel Level Sensor Signal Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUEL LEVEL SENSOR 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

      B77

      2

      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 2.

    NO

    Repair harness or connector.

  2. CHECK FUEL LEVEL SENSOR UNIT (MAIN-SUB) CIRCUIT 
    1. Disconnect fuel level sensor unit and fuel pump (main) connector.
    2. Check for continuity between the fuel level sensor unit (sub) harness connector and the fuel level sensor unit and fuel pump (main) harness connector.

      Fuel level sensor unit (sub)

      Fuel level sensor unit and fuel pump (main)

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B77

      3

      B205

      2

      Existed

    3. Check for continuity between the fuel level sensor unit (sub) harness connector and the ground.

      Fuel level sensor unit (sub)

      Ground

      Continuity

      Connector

      Terminal

      B77

      3

      Not existed

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair harness or connector.

  3. CHECK FUEL LEVEL SENSOR GROUND CIRCUIT 
    1. Check continuity between fuel level sensor unit and fuel pump (main) harness connector and combination meter harness connector.

      Fuel level sensor unit and fuel pump (main)

      Combination meter

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B205

      3

      M53

      24

      Existed

    2. Check for continuity between the fuel level sensor unit and fuel pump (main) harness connector and the ground.

      Fuel level sensor unit and fuel pump (main)

      Ground

      Continuity

      Connector

      Terminal

      B205

      3

      Not existed

    Is the inspection result normal?

    YES

    Replace combination meter. Refer to Removal and Installation .

    NO

    Repair harness or connector.