Manifold Absolute Pressure Sensor

Manifold Absolute Pressure (MAP) sensor responds to changes in intake manifold pressure (vacuum). MAP sensor signal voltage to the PCM varies from below 2 volts at idle (high vacuum) to above 4 volts with ignition on, engine not running or at wide-open throttle (low vacuum). MAP sensor is used to determine following:

• Manifold pressure changes while linear EGR flow test diagnostic is being run.
• Barometric pressure (BARO).

If 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. PCM can detect a shifted MAP sensor. PCM compares MAP sensor signal to a calculated MAP based on throttle position and various engine load factors. If PCM detects a MAP signal that varies excessively above or below calculated value, DTC P0106 will set.