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Home >> Infiniti >> 2017 >> QX50 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 4) >> DTC / Circuit Diagnosis >> DTC P0456: EVAP Control System >> Component Inspection >> Diagnostic Test

Diagnostic Test

  1. CHECK FUEL TANK VACUUM RELIEF VALVE

    1. Turn ignition switch OFF.
    2. Remove fuel filler cap. Refer to EXPLODED VIEW WITH TORQUE SPECIFICATIONS .
    3. Wipe clean valve housing.
      G04073650Courtesy of NISSAN NORTH AMERICA, INC.
    4. Check valve opening pressure and vacuum.
      G04073651Courtesy of NISSAN NORTH AMERICA, INC.
      Pressure: 15.3 - 20.0 kPa (0.156 - 0.204 kg/cm2 , 2.22 - 2.90 psi)
      Vacuum: - 6.0 to - 3.3 kPa (- 0.061 to - 0.034 kg/cm2 , - 0.87 to - 0.48 psi)

    Is the inspection result normal?

    YES 

    INSPECTION END

    NO 

    GO TO STEP 2  .

  2. REPLACE FUEL FILLER CAP

    Replace fuel filler cap. Refer to EXPLODED VIEW WITH TORQUE SPECIFICATIONS .

    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