Corvette CCM Reverse Engineering Anyone?

[spfautsch]

Actually kur4o is correct. The actual hall effect sensor connects to the (our) PCM on a31 and a32. Then it converts it to 4000ppm and outputs it throughout the vehicle on b8. The CCM (and any other modules that need it) gets this conditioned signal on e2, not the actual hall effect sensor. Otherwise the CCM would also need to be programmed for diff gear ratio. This is completely independent of the aldl.

Edit: I think I see the method behind the madness on the odometer storage. I'll need to run up some test bench miles to confirm, but it looks like a 1 in the third (possibly first) byte indicates one of the three odometer bytes has been filled to capacity (FF) and incremented again and is flagged as "skip". If the first byte is not 0 the ff is a part of the stored value. I'm hearing two border collies barking and having trouble focusing, but I'll post more details when I can confirm. This would allow for storing about 268 million miles in four eeprom bytes with minimal single byte erases.