2022 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE

CPC Pressure Sensor: Inspection

  1. Check that the CPC pressure sensor has no deformation, cracks or other damages.
  2. Connect the dry-cell battery positive terminal to terminal No. 3 and the dry-cell battery negative terminal to terminal No. 1, and connect the circuit tester positive terminal to terminal No. 2 and the circuit tester negative terminal to terminal No. 1.
    NOTE:
    • Use new dry-cell batteries.
    • Using a circuit tester, check that the initial voltage of each dry-cell battery is 1.6 V or more. And also check that the voltage of three batteries in series is between 4.8 - 5.2 V.
    • For power supply, 5 V DC constant voltage power source can also be used.
    G08315420Courtesy of SUBARU OF AMERICA, INC.
  3. Check the voltage at a normal atmospheric pressure.
    NOTE: The atmospheric pressure at higher altitude is lower than normal. Therefore, the voltage is lower than the standard value.
    Terminal No. Standard
    2 (+) and 1 (-) Approx. 4.2 V (when 25°C (77°F))
  4. Connect the Mighty Vac to the pressure port (A) of CPC pressure sensor.
    G13198319Courtesy of SUBARU OF AMERICA, INC.
  5. Check the voltage when generating vacuum using Mighty Vac.
    CAUTION: Do not apply a vacuum that exceeds -50 kPa (-0.5 kg/cm2 , -7.2 psi). Doing so may damage the CPC pressure sensor.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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