Engine Control Unit
An engine control unit (ECU), also commonly called an engine control module (ECM) or powertrain control module (PCM), is a type of electronic control unit that controls a series of actuators on an internal combustion engine to ensure optimal engine performance. It does this by reading values from a multitude of sensors within the engine bay, interpreting the data using multidimensional performance maps (called lookup tables), and adjusting the engine actuators. ECU can improve the performance and reduce fuel consumption.
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