Manifold Absolute Pressure (Map) Sensor

PCM delivers a 5-volt supply voltage to MAP sensor. MAP sensor monitors intake manifold vacuum and delivers an input signal to Powertrain Control Module (PCM). When intake manifold vacuum increases, MAP sensor input signal voltage to PCM decreases proportionately. When intake manifold vacuum decreases, MAP sensor input signal voltage to PCM increases proportionately. PCM uses input signal from MAP sensor along with other input signals for controlling ignition system and air/fuel ratio.

MAP sensor is located in front of air intake plenum, between generator and thermostat housing and contains a 3-pin connector.