Corvette CCM Reverse Engineering Anyone?

[spfautsch]

Thank you! I've been searching for that for days.

Interesting, the option bits in message 1 look like it might align perfectly with $b6c6 - $b6c7 if bit 2 set = manual, bit 1 clear = LT1.

I wasn't seeing byte 13 of message 0 change, so I'm going to assume the ccm doesn't think it should record the miles since vats is still active and the engine doesn't appear to be running. Curious how your arduino experiment works out, but I'll just put the seat back in the car and test that way.

Edit: Interesting stuff, somewhat miffed that I failed to locate it on my own. Will save me dozens of hours of pounding the pavement. Option bits align perfectly with $b6c6-$b6c9. Interesting that there's an option for electronic throttle control, which wasn't available until 1997 model year if my assumption is correct. This info is a gold mine. FX3 and LTPMS option bits which were very rare back in the day, hints on how to enable diagnostic mode. Poof, mind blown. I feel like I've just turned the corner on the home stretch.

Edit2: The mileage calculation even confirms my odometer conversion thoughts. The odometer data presented in message 0 won't give the least significant 4 bits either.