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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Intake System (Induction) And Turbocharger (H4DOTC) >> Air By-pass Valve >> Inspection >> Air By-Pass Valve

Air By-Pass Valve

  1. Check that the air by-pass valve has no deformation, cracks or other damages.
  2. Connect the Mighty Vac to the nipple (A) of the air by-pass valve.
    Fig 1: Identifying Air By-Pass Valve Nipple
    G09480133Courtesy of SUBARU OF AMERICA, INC.
  3. Using the Mighty Vac, generate the vacuum pressure to -93.3 kPa (-0.95 kg/cm2 , -13.5 psi). Check that the Mighty Vac gauge needle indication holds 10 seconds without dropping down to lower than -92.6 kPa (-0.94 kg/cm2 , -13.4 psi).
  4. Set a dial gauge to the end of valve rod of the air by-pass valve.
    Fig 2: Setting Dial Gauge To End Of Valve Rod Of Air By-Pass Valve
    G09480134Courtesy of SUBARU OF AMERICA, INC.
  5. Using the Mighty Vac, generate the vacuum pressure, and check the pressure when dial gauge needle (valve stroke) shows 0.5 mm (0.02 in). If it is not within the standard, replace the air by-pass valve.

    Opening pressure (valve stroke 0.5 mm (0.02 in)): 

    Standard 

    -13.3- -21.3 kPa (-0.14- -0.22 kg/cm2 , -1.93- -3.09 psi)

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