ecu - Toyota Yaris Forums

yaris9876 · 10-11-2013, 04:22 PM

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 · 10-11-2013, 06:53 PM

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.

10-11-2013, 04:22 PM	#1
yaris9876 Drives: yaris hatch 07 640K original m Join Date: Mar 2007 Location: usa Posts: 285	ecu 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..

10-11-2013, 06:53 PM	#2
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	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. __________________

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