Symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

Possible Causes

- Manifold Absolute Pressure sensor harness open or shorted to ground - Manifold Absolute Pressure sensor poor electrical connection - Faulty Barometric Pressure (BARO) sensor - Faulty Manifold Absolute Pressure (MAP) sensor - Engine mechanical problems

When Detected

The Engine Control Module (ECM) has detected a correlation error between the Barometric Pressure (BARO) sensor and Manifold Absolute Pressure (MAP) sensor

Description

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.