Great find. It does save me a lot of work, reinventing the wheel.
Too bad Gm changed the algorithm recently.
Now it is time to make a chart with the PCM hardware id and OS/engine RPO vs algorithm number.
Great find. It does save me a lot of work, reinventing the wheel.
Too bad Gm changed the algorithm recently.
Now it is time to make a chart with the PCM hardware id and OS/engine RPO vs algorithm number.
Thank you for sharing. However, I saw nothing in the document to indicate it's source.This was posted elsewhere, sharing here. Judging by the source I would not doubt its authenticity.
What a neat idea.Now it is time to make a chart with the PCM hardware id and OS/engine RPO vs algorithm number.
I am interested in seed / key algo for a BCM. Does it follow the same format as the PCM routine posted earlier?
Hi, New just now to this site and have a question... I am very interested in the seed/key algorithm. I began to write a program to do an automatic decode. The line "• 0x2A = Complement – if HH>LL use 2’s complement, else use 1’s complement" agrees with what I have done, but later in the document the line "Thus, given the seed 0x1234: a) ~0x1234 = 0xEDCB b) 0xEDCB ROR 3 = 0x7DB9 c) 0x7DB9 " shows him using a 1s complement. I believe the calculation is off. Hope this thread is still active.
Also wonder if a '97 Camaro 5.7 would be covered by one of the algorithms. If yes which of the 256. I have worked out where the seed and key is stored in the internal HC11 EEPROM. Just need to find a way to access it.
Hope there is still interest in a key gen...
Tom
Thank you Kur40. I had figured the key & seed to be at $E00 thru $E03. Thank you for confirmation.
I will finish the keygen and try it out with $05. Great help!
I have a large part of the OBDII code dis-assembled and working to comment. Is this interesting to others? If yes, where should the result be posted when I complete it.
This is a generous offer. A tool to test seed/key algos could be useful.
How large is the disassembly file? If not too large you can upload it to its own thread and I or a mod can make it a sticky. If it's too large to upload send me a PM and we'll figure out another path.
Bookmarks