Manifold Pressure/Vacuum Sensor: Testing and Inspection

1) Disconnect manifold differential pressure sensor vacuum hose from filter.
2) Disconnect manifold differential pressure sensor coupler.
3) Remove manifold differential pressure sensor.





4) Arrange 3 new 1.5V batteries in series and connect its positive terminal to "VIN" terminal of coupler and negative terminal to "Ground" terminal. Then check voltage between "Vout" and "Ground".
Also, check if voltage reduces when vacuum is slowly applied up to 400 mmHg by using vacuum pump.

CAUTION:
As connection to wrong terminal will cause damage to manifold differential pressure sensor, make absolutely sure to connect properly as shown in the above image.





Output voltage (VIN voltage 4.5V)

If check result is not satisfactory, replace manifold differential pressure sensor.
5) Install manifold differential pressure sensor and connect vacuum hose securely.
6) Connect manifold differential pressure sensor coupler securely.