Manifold Pressure/Vacuum Sensor: Description and Operation

Fig. 3 Manifold Absolute Pressure (MAP) sensor location:

The MAP sensor, Fig. 3, is mounted in the engine compartment on the dash panel and monitors intake manifold vacuum through a line connected to the throttle body. The sensor converts manifold vacuum (negative pressure) and barometric pressure into electrical signals and transmits these signals to the SMEC. The SMEC uses these signals to monitor engine load and atmospheric conditions in order to determine the correct air/fuel mixture for vehicle operating conditions.