DENSO has produced a YouTube video which highlights the function of the engine management system (EMS).
This latest video presents an overview of what the engine management system does, as well as explaining why and how it does it:
The EMS effectively monitors and subsequently controls factors such as the fuel, air and combustion process within the engine. It does this through a series of sensors and actuators which communicate with the vehicle’s electronic control unit (ECU) to manage the engine’s functions.
The sensors monitor parameters such as engine speed, airflow, throttle position, coolant temperature and exhaust gases and the ECU matches them against a designated set of values and, if necessary, controls the actuators to ensure the correct levels are met, which ensures fuel consumption and exhaust emissions are kept at their optimum. If, however, engine faults develop which the actuators can’t adequately adjust, the EMS will store them as fault codes which a technician can find using a diagnostic tool, meaning it can be dealt with in the workshop.
