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Circuit Description

The powertrain control module (PCM) uses the following information to calculate an expected airflow rate:

The throttle position (TP)
The barometric pressure (BARO)
The manifold absolute pressure (MAP)
The intake air temperature (IAT)
The mass air flow (MAF)
The engine RPM

If the PCM detects the airflow rate is more than expected, DTC P0121 sets.