Corvette CCM Reverse Engineering Anyone?

[spfautsch]

First, engine revolutions and miles are not the only factors used for the oil life monitor. Oil temperature also affects the calculation.

Thanks, that might account for some of that info. I'd forgotten about oil temp being factored in. On the salvage ccm it's almost all zeros, but I also noticed the remaining miles was set to 7500 on it (I haven't messed with resetting it). I suppose this might be a ccm from a legitimate low-miles garage queen. It also has a really small # in the presumed erase counter.

what's likely happening on your salvage CCM is you're actually running into the security lockout.

I've considered that but I've been removing power between attempts and I'm not seeing any changes in the eeprom between attempts so I'm not sure how it would know there was a "penalty period" remaining. I don't have enough switches and buttons to simulate a key-on event on the test bench, but I might attempt it because I'd really like to confirm what vats resistor it wants. It's certainly not 15.

Edit: Anyone know how to query this thing for vehicle speed via mode1? I can't tell if it thinks it's moving or not.