Injector, Diesel Exhaust Fluid: Operation: Operation
WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The Diesel Exhaust Fluid (DEF) Injector is mounted to the decomposition tube at the inlet of the Selective Catalytic Reduction (SCR) Catalyst. The DEF dosing Control Unit sends a Pulse Width Modulated (PWM) signal to the DEF Injector to vary the amount of fluid sprayed into the exhaust stream.