When Monitored
WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
At key off the PCM closes the EGR Valve tight with a -30% duty cycle for 300 ms and reads the sensor voltage. This offset value is stored in the PCM non volatile memory. With the engine running during normal operation and the EGR Valve closed, the PCM runs an error monitor that compares the difference between the actual EGR Valve position and learned position.