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HOMESERVICE MANUALSSUBARU2022IMPREZA BASE, 4D SEDAN, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 5 (FUEL INJECTION SYSTEM (HEV))MANIFOLD ABSOLUTE PRESSURE SENSORINSPECTION
2022 Subaru Impreza Base, 4D Sedan, Automatic CVT Trans

Manifold Absolute Pressure Sensor: Inspection

2022 Subaru Impreza Base, 4D Sedan, Automatic CVT TransSECTION Inspection
WARNING: This page is about a different car, the 2022 Subaru Crosstrek. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check that the manifold absolute pressure sensor has no deformation, cracks or other damages.
  2. Using new dry cell batteries, connect the battery positive terminal to terminal No. 1 and the battery negative terminal to terminal No. 2, and connect the circuit tester positive terminal to terminal No. 3 and the circuit tester negative terminal to terminal No. 2.
    NOTE:
    • 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. 
    G12391499Courtesy 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
    3 (+) and 2 (-) Approx. 4.65 V (when 25°C (77°F))
  4. Connect the Mighty Vac to the pressure port (A) of manifold absolute pressure sensor.
    G11252906Courtesy of SUBARU OF AMERICA, INC.
  5. Check the voltage when generating vacuum using Mighty Vac.
CAUTION:

Do not reduce the pressure that exceeds -105 kPa (-1.07 kg/cm 2  , -15.2 psi). Doing so may damage the manifold absolute pressure sensor. 

RENDER: 1.0x

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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.