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The Engine Control Unit (ECU) in automotive systems is a crucial electronic component responsible for managing engine performance by processing data from various sensors. It controls functions such as fuel injection, ignition timing, and emissions to optimize efficiency and power output. Modern vehicles may have multiple ECUs for different systems, like transmission and braking, all communicating to enhance overall vehicle performance and safety. The ECU plays a vital role in the vehicle's diagnostics, helping to identify issues and improve maintenance.

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