Circuit Description

The DTC P2227 Barometric Pressure (BARO) Sensor Performance diagnostic checks the accuracy of the BARO sensor signal. The BARO sensor and circuitry are located inside of the Powertrain Control Module (PCM). Barometric pressure varies with weather conditions and changes in the altitude from sea level. The PCM modifies fuel and spark delivery in response to barometric pressure changes. The PCM uses the Manifold Absolute Pressure (MAP) sensor reading to predict the expected BARO sensor value when running the DTC P2227 diagnostic.