Manifold Absolute Pressure Sensor

The Manifold Absolute Pressure (MAP) sensor measures changes in manifold pressure. Changes in manifold pressure result from engine load and speed changes. The MAP sensor converts these changes in manifold pressure into a voltage output signal to PCM (less than 2.0 volts at idle to about 4.0 volts key on engine not running at WOT). The PCM can monitor these signals and adjust air/fuel ratio and ignition timing under various operating conditions.