Theory Of Operation

WARNING: This page is about a different car, the 2014 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

The EGR Airflow Control Valve is a pulse width modulated output, controlled by the Powertrain Control Module (PCM). The EGR Airflow Control Valve is used to control the ratio of fresh air flow to EGR gas air flow. The PCM monitors this ratio with the Mass Air Flow Sensor. The Mass Air Flow Sensor feedback is very prominent in determining the position of the EGR Airflow Control Valve. If the Mass Air Flow Sensor feedback does not match what the PCM is expecting to see when EGR air flow is requested, it can effect the operation of the EGR Valve and the EGR Airflow Control Valve. This can occur if the Mass Air Flow Sensor feedback is faulty or inaccurate, even if no DTCs are actively set. The EGR system and Diesel Particulate Filter regeneration is disabled when the fault is active.