Theory of Operation
WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
This diagnostic is used to check for low Exhaust Gas Recirculation (EGR) flow conditions by calculating an error based on the commanded and actual EGR flow. If the error is too high for a calibrated period of time, the diagnostic fails. This algorithm is not used at areas high on the torque curve. The Powertrain Control Module (PCM) will light the MIL lamp after this monitor runs and fails twice. The PCM will turn off the MIL lamp once the diagnostic runs and passes in four consecutive drive cycles.