Manifold Absolute Pressure Sensor

The manifold absolute pressure sensor is attached to the top of the throttle body, 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 Terminal Of Manifold Absolute Pressure Sensor

Courtesy of SUBARU OF AMERICA, INC.