what is a ecu

An Electronic Control Unit (ECU) is a crucial component in a vehicle's electronic system. It is essentially a computer that controls one or more of the vehicle's electrical systems. The ECU is responsible for various functions, such as controlling the engine, transmission, and other systems like the power steering, seats, and airbags. It receives inputs from different parts of the vehicle and uses this information to compute the needed outputs. The ECU is often referred to as the "brain" of the engine, as it controls the injection of fuel and the timing of the spark in petrol engines. Today's vehicles may contain 100 or more ECUs, each dedicated to controlling specific functions, and they come in various makes, shapes, and sizes. The ECU is typically located near the engine, but its specific location can vary depending on the make and model of the vehicle