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Home >> Infiniti >> 2014 >> QX80 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0137 To P0456 >> DTC P0456: EVAP Control System >> Component Inspection (Fuel Filler Cap)
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Component Inspection (Fuel Filler Cap)

  1. CHECK FUEL FILLER CAP 
    1. Turn ignition switch OFF.
    2. Remove fuel filler cap.
    3. Wipe clean valve housing.
      Fig 1: Identifying Pressure And Vacuum Valve, Spring, Gasket And Plate
      G09178122Courtesy of NISSAN NORTH AMERICA, INC.
    4. Install fuel filler cap adapter (commercial service tool) to fuel filler cap.
    5. Check valve opening pressure and vacuum.

      Pressure: 15.3 - 20.0 kPa (0.156 - 0.204 kg/cm 2  , 2.22 - 2.90 psi) 

      Vacuum: -6.0 to -3.3 kPa (-0.061 to -0.034 kg/cm 2  , -0.87 to -0.48 psi) 

      Fig 2: Checking Valve Opening Pressure And Vacuum Using Suitable Tool
      G09178123Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: INSPECTION END

      NO: GO TO 2.

  2. REPLACE FUEL FILLER CAP 

    Replace fuel filler cap.

    CAUTION: Use only a genuine fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may illuminate.

    : INSPECTION END