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Home >> Infiniti >> 2018 >> QX80 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 2) >> Component/Circuit Diagnosis >> EVAP Control System Pressure Sensor >> Component Inspection
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Component Inspection

  1. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 
    1. Turn ignition switch OFF.
    2. Remove EVAP control system pressure sensor with its harness connector.

      Always replace O-ring with a new one.

    3. Install a vacuum pump to EVAP control system pressure sensor.
    4. Turn ignition switch ON and check output voltage between ECM harness connector terminals under the following conditions.

      ECM

      Condition

      [Applied vacuum kPa (kg/cm 2 , psi)]

      Voltage (V)

      Connector

      +

      -

      Terminal

      Terminal

      E20

      121

      148

      Not applied

      1.8 - 4.8

      -26.7 (-0.272, -3.87)

      2.1 to 2.5 lower than above value

      CAUTION:
      • Always calibrate the vacuum pump gauge when using it.
      • Never apply below -93.3 kPa (-0.952 kg/cm 2 , -13.53 psi) or pressure over 101.3 kPa (1.033 kg/cm 2 , 14.69 psi).

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Replace EVAP control system pressure sensor.