“emission control system” means the exhaust aftertreatment
system, the electronic management controller(s) of the engine
system and any emission-related component of the engine
system in the exhaust which supp
lies an input to or receives an output from this(these) controller(s), and when applicable the communication interface (hardware and messages) between the engine
system electronic control unit(s) (EECU) and any other power train or vehicle control
...[+++] unit with respect to emissions management;