ecu

[yaris9876]

little off topic
anyone know how to download a ECU to show all its code..??
and is there a book to teach you how to read the full computer code that is in the ecu??
not the trouble codes but the whole operating code..

[CTScott]

Toyota is very protective of the firmware of its modern ECMs. The NHTSA found this out when the whole acceleration issue was going on.

I have actually extracted the firmware from the ECM, but will not share it, as whomever figures out how to modify it and feed it back into the ECM is destined to make some serious cash.

The ECM code, once extracted is low level opcodes, which is not user friendly for reading. I have a disassembler for the NEC microcontroller, which is the main processor of the ECM, but even disassembled, with the sheer volume of code and the fact that disassembled code doesn't have the flow of pre-compiled code, it is very painful to work with. I have been working with this type of stuff for more than 25 years, and it is still a huge task for me.