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How does programming work on an ECU?

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To answer your question I would like to draw an analogy between your CPU of a PC / Laptop and the ECU . Consider a computer that doesnt come pre-installed with an OS. It still has a BIOS that starts up and asks for some bootable device from wh... read more

In general, most of the ECUs have custom bootloader (firmware) according to the OEM. Most of the programming are done as per Unified Diagnostic Services (google it) and are similar for all 80 ECUs. read more

The ECU is removed from the motorcycle and connected to a programmer. Usually software is installed on a laptop but sometimes is a stand alone module or other system. The software allows access to the programming in the ECU and by changing parity bits and field options you can change how the ECU carries out its instructions. 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

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