Working at an ECU is actually not complicated as one might assume. On a very basic level, an ECU is an electronic device fed with several inputs.

The data from these inputs is assessed by the ECU and compared against stored onboard data. The ECU then decides what needs to happen to ensure the system in question functions properly and issues new commands to suit. With multiple sensors around a vehicle feeding the ECU data it can manage and control the electronic systems efficiently by giving orders to improve their output.

For example, modern electronic fuel injection systems are controlled by ECUs. Data, including temperature, engine speed and accelerator position is fed into the ECU. The ECU then compares the data against onboard tables that tell it what the engine ideally needs, and alters the behavior of the fuel injectors to deliver the best performance.

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