Manifold Absolute Pressure (MAP) Sensor

The Manifold Absolute Pressure (MAP) sensor responds to changes in intake manifold pressure. The PCM supplies a 5 Volt Reference and ground for the MAP sensor. The MAP sensor circuit provides a signal to the PCM relative to pressure changes in the manifold. With the key ON, engine not running, the MAP sensor signal voltage to the PCM varies between 1.5-2.5 volts. With the engine running, the MAP sensor voltage to the PCM varies from below 2 volts at idle, low manifold absolute pressure - high vacuum, to above 4 volts at Wide Open Throttle, high manifold absolute pressure - low vacuum.

If the PCM detects a voltage that is lower than the possible range of the MAP sensor, DTC P0107 will be set. A signal voltage higher than the possible range of the sensor will set DTC P0108. An intermittent low or high voltage will set DTC P1107 or P1106 respectively.