What role does the ECU (Engine Control Unit) play in an engine?

The Engine Control Unit (ECU) is a critical component in modern vehicles, responsible for optimizing engine performance. It achieves this by controlling various parameters related to fuel injection and ignition timing. By adjusting these factors, the ECU ensures that the engine operates efficiently, meeting performance requirements while also maintaining fuel economy and reducing emissions.

When it comes to fuel injection, the ECU calculates the ideal amount of fuel needed based on factors such as engine temperature, load, and speed. This precise control allows for optimal combustion, which is essential for maximizing power output and minimizing waste.

In addition, the ECU manages ignition timing, which is crucial for ensuring that the fuel-air mixture ignites at the right moment during the engine cycle. This timing affects engine performance, efficiency, and responsiveness. By coordinating these two critical functions, the ECU enhances the overall operation of the engine, contributing to smooth performance and compliance with emissions regulations.

The other options describe functions that are either unrelated to the ECU's primary role or pertain to different systems in the vehicle. The ability to manage engine performance through fuel and ignition control makes the ECU a vital element in ensuring the efficient and effective functioning of the engine.