The Engine Control Module (ECM) is also known as the Powertrain Control Module (PCM) or the Engine Control Unit (ECU).
The main responsiblity of this controllers is to get information from sensors and run certain actuators. In the case of any errors arising the ECU shows a check engine light on your dashboard.
This hub discusses the where and why sensors are placed in certain positions and some insight as to how or what the sensors sense. If you are a DIY person then you could even open up the sensors yourself and clean them for optimum signals to reach your ecu.
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