Manifold Pressure/Vacuum Sensor: Description and Operation

PURPOSE
The manifold differential pressure sensor converts air pressures in the intake manifold plenum into voltage signals and inputs it to the engine control module. The engine control module monitors the EGR system using this signals and generates the diagnostic trouble code if there is an abnormality in the EGR system.

NOTE: Only vehicles equipped with California Emissions have a manifold differential pressure sensor.

OPERATION
5V of power is supplied to the manifold differential pressure sensor from the engine control module, and the sensor circuit ground is located in the engine control module.

MAP Sensor Pressure To Voltage Curve:

The manifold differential pressure sensor output voltage is proportioned to the intake manifold plenum pressure and sent to the engine control module.