Corvette CCM Reverse Engineering Anyone?

[spfautsch]

I somewhat believe these things are more primitive than you would care to believe. Maybe I'm reading the stuff NomakeWan posted too literally, but if it says "upload to RAM will be denied" I tend to believe the eeprom write / erase stuff may not be required. The program shouldn't be trying to write to eeprom every time the odometer increments.

My hillbilly dissertation of how I think it might work is as such:

Mode 5 commands upload values directly to ram. I.E. VIN, engine code, transmission type (autos had a fluid temp sensor), odometer, etc. Then let the machine go to sleep and the eeprom compare / write function takes care of things. I'll experiment more with the english / metric bit tomorrow to see if it's retained after a power loss. If it is that will surely tell us something valuable.

I'm plugging along. Have the address / bit location for another 5 digital inputs. Not many more left before I have to start looking for ADC registers.