Manifold Differential Pressure Sensor Check

1. Disconnect manifold differential pressure sensor coupler.
2. Remove manifold differential pressure sensor.
3. Check pressure passage and air vent hole for clog. Clean if clogged.

CAUTION: Do not put drills or wires into passage and hole for cleaning. It causes damage in it.




4. Arrange 3 new 1.5 V 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 figure.




Output voltage at "Vout" (When voltage at "Vin" is 4.5 V)

If check result is not satisfactory, replace manifold differential pressure sensor.

5. Install manifold differential pressure sensor. Connect manifold differential pressure sensor coupler securely.