[amidgeha]

Manifold Absolute Pressure - Barometric Pressure Correlation

The barometric pressure (BARO) sensor measures the pressure of the atmosphere. This pressure is affected by altitude and weather conditions. A diaphragm within the BARO sensor is displaced by the pressure changes that occur from varying altitudes and weather conditions. The sensor translates this diaphragm action into the voltage signal input that is used by the Powertrain Control Module (PCM) for diagnostics and emissions control.

Cause:
Faulty Barometric Pressure (BARO) sensor
Faulty Manifold Absolute Pressure (MAP) sensor
Manifold Absolute Pressure sensor harness open or shorted to ground
Manifold Absolute Pressure sensor circuit poor electrical connection
Large vacuum leak

Symptoms:
Check engine light