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Engine control unit
Computer that adjusts electronics in an internal combustion propulsion system / From Wikipedia, the free encyclopedia
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For other uses, see ECU (disambiguation).
An engine control unit (ECU), also called an engine control module (ECM),[1] is a device which controls multiple systems of an internal combustion engine in a single unit. Systems commonly controlled by an ECU include the fuel injection and ignition systems.
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The earliest ECUs (used by aircraft engines in the late 1930s) were mechanical-hydraulic units; however, most 21st-century ECUs function by digital electronics.