DTC P1514: Calculated Vs Actual Airflow Correlation High: Description
WARNING: This page is about a different car, the 2003 GMC Envoy XL and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
The Powertrain Control Module (PCM) uses the following readings in order to calculate the predicted Mass Air Flow (MAF) rate:
- The Throttle Position (TP).
- The Barometric (BARO) pressure.
- The Intake Air Temperature (IAT).
- The engine RPM.
The PCM compares the predicted MAF value to the actual MAF value, and to the speed density calculation in order to verify the proper throttle operation.