Barometric Pressure Sensor: Description and Operation

MAP/BARO Sensor:

Manifold Absolute Pressure/Barometric Pressure Sensor
The Manifold Absolute Pressure/barometric Pressure (MAP/BARO) sensor (Figure 10) is an input to the Powertrain Control Module (PCM). The sensor is used in conjunction with a MAP/BARO solenoid that either supplies manifold vacuum (MAP function) to the MAP/BARO sensor or opens the sensor to atmospheric pressure (BARO function). The PCM uses the MAP/BARO data to control the EVAP emissions system.