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How does the ECU in a car work?

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Most engine systems have idle speed control built into the ECU. The engine RPM is monitored by the crankshaft position sensor which plays a primary role in the engine timing functions for fuel injection, spark events, and valve timing. ... Early Throttle body injection (TBI) systems used an idle air control stepper motor. read more

The ECU does all of this to ensure the lowest emissions and best mileage. See How Fuel Injection Systems Work for a lot more detail on what the ECU does. The pins on this connecter interface with sensors and control devices all over the car. read more

A car's computer or PCM - ECM (powertrain control module - engine control module) is designed to read various sensors such as the crankshaft position sensor to deliver electrical commands to the fuel injectors, ignition system, transmission and camshaft position to name a few. read more

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