Manifold Pressure/Vacuum Sensor: Description and Operation

Manifold Absolute Pressure (MAP) Sensor:

The MAP Sensor, located on the center of the firewall, is an engine vacuum sensor that provides input to the ECU so fuel can be injected according to engine load, rpm, acceleration and deceleration. The MAP Sensor also provides some air/fuel mixture compensation for altitude. The ECU provides reference voltage to the MAP through terminal VCC, ground through terminal E2 and input to the ECU through terminal PIM.