Which of the following components does the ECM NOT control?

The engine control module (ECM) is primarily responsible for managing various aspects of engine operation to optimize efficiency, performance, and emissions. Among its critical functions are fuel delivery, which involves controlling the fuel injectors and regulating the air-fuel mixture for proper combustion. Additionally, the ECM manages the timing of the engine, ensuring that ignition and fuel injection occur at the correct times for optimal engine performance. It also processes data from various sensors throughout the engine and vehicle systems to make real-time adjustments.

The component not under the direct control of the ECM is the brake function. While many modern vehicles have an electronic control unit or module that manages anti-lock braking systems (ABS) or stability control, these systems operate independently from the ECM. The brake function is primarily concerned with the mechanical and hydraulic operations of the braking system, not engine management. Therefore, the ECM does not control the mechanisms required for braking, which is why this option is the correct choice.