Manifold Absolute Pressure Sensor

The manifold absolute pressure sensor is attached to the intake manifold, and continuously sends to the engine control module (ECM) voltage signals that are proportional to intake manifold absolute pressures. The ECM controls the fuel injection and ignition timing based on the intake manifold absolute pressure signals in addition to other signals from many sensors and other control modules.

Fig 1: Identifying Manifold Absolute Pressure Sensor Components

Courtesy of SUBARU OF AMERICA, INC.