Manifold Absolute Pressure Sensor: Inspection

Check that the manifold absolute pressure sensor has no deformation, cracks or other damages.
Using new dry cell batteries, connect the battery positive terminal to terminal No. 3 and the 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:
- 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 (+) and 1 (-)	Approx. 3.6 V (when 25°C (77°F))

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

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Check the voltage when generating vacuum using Mighty Vac.

CAUTION: Do not reduce the pressure that exceeds -105 kPa (-1.07 kg/cm² , -15.2 psi). Doing so may damage the manifold absolute pressure sensor.

NOTE: When vacuum occurs at the pressure port of manifold absolute pressure sensor, the voltage will drop from the value as in step 3.

Pressure	Terminal No.	Standard
-35 kPa (-0.36 kg/cm² , -5.1 psi)	2 (+) and 1 (-)	Approx. 2.6 V (when 25°C (77°F))