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The brain box, or engine control unit (ECU), in a 2003 Toyota RAV4 is responsible for managing and coordinating various engine functions. It processes data from sensors to optimize fuel injection, ignition timing, and emissions control for improved performance and efficiency. Additionally, it can store diagnostic trouble codes to help identify issues within the vehicle's systems. Overall, the ECU plays a crucial role in ensuring the engine operates smoothly and efficiently.

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3w ago

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