Engine Control Module
WARNING: This page is about a different car, the 2015 Volkswagen Passat. However, it is still accessible from the selected car via links, so may be relevant.
The ECM regulates fuel injection, throttle valve control module, oxygen sensor heaters, ignition, knock control, evaporative emission purge valve, engine speed limitation through the fuel injectors or the power supply relay, as well as OBD functions.