Actuators are devices which work according to the command of ECM. Various sensors send signals directly to the ECM, and then ECM takes decision. After that, the ECM sends signals to different actuators to work according to the command. Practically, actuators are transducers. You can also say actuators as the electrical to mechanical signal converter. It takes electrical signals and controls mechanical motion. Basically, sensors are input devices and actuators are output devices of an ECM.
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