A Engine Control Module (ECM) is also called as Engine control unit, a device used to manage the engine control system. The main process of an engine control unit (ECU) is to control the various features of the internal combustion engines operation. ECU determines the quantity of fuel, ignition timing and other parameters by monitoring the engine through sensors. The ECU works according to the input data that it gets from the various sensors that are located within the engine. The various types of sensors that are fitted all over the engine are MAP sensor, throttle position sensor, air temperature sensor, oxygen sensor and many more similar ones.

The ECU (Engine Control Unit) uses the closed loop control method, where it monitors the output of a system in order to control the inputs to a system. Since, the ECU (Engine Control Unit) gathers data from various different sensors, it knows all about the coolant temperature to the amount of oxygen in the exhaust.

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