What is the role of the ECU in engine management?

The role of the Engine Control Unit (ECU) in engine management is to regulate engine performance based on a variety of data it receives from numerous sensors throughout the engine and vehicle. The ECU processes this information to make real-time adjustments to vital engine functions such as fuel injection timing, ignition timing, and other parameters essential for optimal engine performance, efficiency, and emissions control.

By analyzing data such as engine temperature, throttle position, and airflow, the ECU ensures that the engine runs smoothly across different operating conditions. This active management allows for improved fuel economy, reduced emissions, and enhanced engine responsiveness, making it a critical component in modern engine designs.

The other options do not align with the ECU's functions. The ECU does not physically alter the weight of the engine, perform repairs, or replace components like air filters, which are tasks typically handled during service and maintenance by technicians rather than by the ECU itself.