Thank you... this is a good thread for me. I have some documents specific to the '97 lt1 malf codes I will post.

-Tom

I am interested in what you are doing & would help if I can.

I believe that early cars (1997 and earlier: perhaps '98, '99) connect to various modules outside the PCM with serial / aldl type...

Keyset for seed: 4FEE

Seed: 4FEE Key: B011 Algorithm: 0 EL327 command: 2702B011
Seed: 4FEE Key: A214 Algorithm: 1 EL327 command: 2702A214
Seed: 4FEE Key: 1F9E Algorithm: 2 EL327...

Hi,

In the '97 code, A/D uses this sort of code with a small change to the code "ORRA" to other values. Each represents a different analog... I *think* I know which they are but need to be more...

Easiest for 1's and 2's for me is ...

calc_acc = ~calc_seed; // One's
calc_acc = -calc_seed; // Two's

Thank you for your post, I will look through the thread. I would like to write that...

Hi,
I wrote a program to take the PCM seed and generate 256 keys (one for each of the algorithms) and throw it in a file. I ran into a problem with the complement instruction. The document defines...

Ok will do. I am not so sure of how the site works though. Once commented (estimate about a week or so) I will be in touch with size. I have found many of the code parameters from the OBD code. When...

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...

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...