Yup, a checksum value should in theory tell you if values had been manipulated and therefore act as a beacon for further investigation. If you provide the dealer with a car that is in a different map state than I'd fully expect to get 'caught'. The adaptations shouldn't change the state of the base map.I've heard all sorts of rumours on the VAG forums about this for my engine, claiming that they can check checksum values to see if its had anything done.
In my mind the checksum would show if the values had been manipulated, but isn't there some variance of 'mapping' with most modern ECU's anyway as they adapt to climate/fuel/servicing/etc
A date stamp is a date stamp. Firstly, I would not be surprised if these can be faked. Secondly, it tells you the ECU has been flashed, not that the car has been mapped. In the event of a warranty claim (which is all we care about), I'd like to see the clause that doesn't allow you to flash the manufacturer's recommended software on to your car.I know on the Clios there was a date stamp that you could pull off to see when the map went on, and also a history of the previous few maps.
I'd think it's a case of on the face of it they wouldn't notice/bother looking for it, but if they were actively looking for evidence of a different map I'm sure the information would be there for them to obtain.
Short of the ECU containing an unchangeable history of values/checksums of the map (and only checksums if it's unchangeable, as there's no reason you couldn't fake those), or you provide them with a car running a remap, I'm not sure what there is to prove a map has been on the car. I don't believe many ECUs are that sophisticated.
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think of it like a secret feature, like the hidden storage compartments on the S2000 
