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Home >> Infiniti >> 2021 >> QX50 Essential, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter, Warning Lamp & Indicator (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> DTC B1402: Fuel Level Sender Circuit >> Component Inspection

Component Inspection

  1. CHECK FUEL LEVEL SENSOR UNIT AND FUEL PUMP (FUEL LEVEL SENSOR) (MAIN) 
    1. Remove the fuel level sensor unit and fuel pump (fuel level sensor) (main). Refer to Removal and Installation .
    2. Check the resistance between fuel level sensor unit and fuel pump (fuel level sensor) (main).
      GNSALNIA0129Z-129Courtesy of NISSAN NORTH AMERICA, INC.

      Fuel level sensor unit and fuel pump (fuel level sensor) (main)

      Condition

      Resistance (Ohm)

      (Approx.)

      Height

      [mm (in)]

      Terminals

      3

      1

      Full * (A)

      25.5

      179.2(7.05)

      Empty * (B)

      125.5

      10.2 (0.4)

      2

      2

      --

      0

      --

      *: When float rod is in contact with stopper.

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Replace fuel level sensor unit and fuel pump (fuel level sensor) (main). Refer to Removal and Installation .

  2. CHECK FUEL LEVEL SENSOR UNIT (SUB) 
    1. Remove the fuel level sensor unit (sub). Refer to Removal and Installation .
    2. Check the resistance between fuel level sensor unit (sub).
      GNSALNIA0130Z-130Courtesy of NISSAN NORTH AMERICA, INC.

      Fuel level sensor unit (sub)

      Condition

      Resistance (Ohm)

      (Approx.)

      Height

      [mm (in)]

      Terminals

      2

      1

      Full * (A)

      65.5

      179.9 (7.8)

      Empty * (B)

      157.5

      10.1 (0.3)

      *: When float rod is in contact with stopper.

    Is the inspection result normal?

    YES

    Inspection End.

    NO

    Replace fuel level sensor unit (sub). Refer to Removal and Installation .