Exhaust Gas RECIRCULATION: Valve: Operation

The exhaust gas recirculation flow is determined by the powertrain control module (PCM). For a given set of conditions, the PCM calculates the ideal exhaust gas recirculation flow to minimize NOx emissions and maximize fuel economy by adjusting the pintle position. Pintle position is controlled by the EGR solenoid. The PCM adjusts the duty cycle of the power supplied to the solenoid coil to obtain the correct position.