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Manifold Absolute Pressure Sensor: Inspection
- Check that the manifold absolute pressure sensor has no deformation, cracks or other damages.
- Connect dry-cell battery positive terminal to terminal No. 3 and dry-cell battery ground terminal to terminal No. 1, circuit tester positive terminal to terminal No. 2 and the circuit tester ground terminal to terminal No. 1.
NOTE:
- Use new dry-cell batteries.
- Using circuit tester, check that the initial voltage of a single dry-cell battery is 1.6 V or more. And also check that the voltage of three batteries in series is between 4.8 V and 5.2 V.
- For power supply, 5 V DC voltage source can also be used.
Courtesy of SUBARU OF AMERICA, INC.
- 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)) |
- Connect the Mighty Vac to the pressure port (A) of manifold absolute pressure sensor.
Courtesy of SUBARU OF AMERICA, INC.
- Check the voltage when generating vacuum using Mighty Vac.
CAUTION:
Do not apply vacuum of less than -88 kPa (-0.9 kg/cm2
, -12.8 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 |
| -88 kPa (-0.9 kg/cm2
, -12.8 psi) |
2 (+) and 1 (-) |
Approx. 1 V (when 25°C (77°F)) |