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.
The Diesel Exhaust Fluid (DEF) Dosing Control Unit is used to control the operation and monitoring of the Diesel Exhaust Fluid system. The aftertreatment Diesel Exhaust Fluid Dosing Control Unit is equipped with an internal temperature sensor, which monitors the temperature inside the control unit during operation. The DEF Dosing Control Unit shares this information with the Powertrain Control Module over the J1939 Data Link. Diesel exhaust fluid injection into the aftertreatment system is disabled.