Main task

During quick load changes, the engine load or airmass/combustion that is calculated based on values from the mass air flow sensor may differ from the actual airmass sucked into the cylinder during the intake stroke. This is caused by the inertia of the large air volume in the intake system. Therefore, intake pressure is used during load changes to correct the airmass/combustion used when calculating fuel quantity.

The pressure is also used to correct purging's PWM ratio. With high intake pressure, a greater PWM ratio is needed to maintain the same purge flow.

The value from the pressure sensor is also used as a substitute value for the mass air flow sensor if the diagnostic system has detected a fault in the mass air flow sensor.