What are the main functions of the engine control unit (ECU)?

The engine control unit (ECU) is primarily responsible for managing various functions of the engine to ensure it operates efficiently and effectively. This involves overseeing the fuel delivery system, ensuring the right amount of fuel is injected into the engine based on its needs, and controlling ignition timing to optimize performance and reduce emissions. The ECU utilizes sensors to gather real-time data regarding engine conditions and performance metrics, enabling it to make rapid adjustments and improve overall engine dynamics.

Through this management, the ECU plays a critical role in maximizing power output, improving fuel efficiency, and maintaining emissions within acceptable limits. Thus, option B accurately describes the essential functions of the ECU in modern vehicles. Other options focus on aspects unrelated to engine performance, underscoring the specialized role of the ECU in engine operation.