An engine control unit (ECU), also called an engine control module (ECM),[1] is a device that controls various subsystems of an internal combustion engine. Systems commonly controlled by an ECU include the fuel injection and ignition systems.
The earliest ECUs (used by aircraft engines in the late 1930s) were mechanical-hydraulic units; however, most 21st-century ECUs operate using digital electronics.
- ^ "How an Automotive Computer Works". www.2carpros.com. Retrieved 14 May 2023.