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Check that the CPC pressure sensor has no deformation, cracks or other damages.
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.
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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 (+) - 1 (-)	Approx. 3.6 V (when 25°C (77°F))

Connect the Mighty Vac to the pressure port (A) of CPC pressure sensor.

Courtesy of SUBARU OF AMERICA, INC.
Check the voltage when generating vacuum using Mighty Vac.
CAUTION:
Do not apply a vacuum that exceeds -50 kPa (-0.5 kg/cm ² , -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.

Safety Warning

CPC Pressure Sensor: Inspection

Use the Manual With the Right Hardware

When to See a Mechanic