Manifold Absolute Pressure (MAP) Sensor

MAP sensor is mounted on side of throttle body and is connected to throttle body by an L-shaped fitting. This sensor is used by PCM to calibrate amount of air/fuel mixture supplied to engine. Sensor measures manifold absolute pressure. Ambient barometric pressure is also measured when ignition switch is first turned on, during engine cranking, and at wide open throttle.

MAP sensor transmits a low voltage signal (1.5-2.1 volts) at idle when manifold vacuum is high, and a higher voltage signal (3.9-4.8 volts) during open throttle when manifold vacuum is low.