Manifold Absolute Pressure Sensor

The manifold absolute pressure (MAP) sensor responds to changes in intake manifold pressure. The PCM supplies a 5 volt reference and a ground for the MAP sensor. The MAP sensor provides a signal to the PCM relative to pressure changes in the manifold. The MAP sensor signal voltage to the PCM varies from below 2 volts at idle (low manifold absolute pressure - high vacuum) to above 4 volts with the key on and the engine not running or at wide-open throttle (high manifold absolute pressure - low vacuum). The MAP sensor is used to determine manifold pressure changes while the linear EGR flow test diagnostic is being run (refer to DTC P0401), to determine engine vacuum level for other diagnostics, and to determine the Barometric Pressure (BARO).

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