Quote:
Originally posted by apr67:
The Programing on an OBD1 or OBD2 is downloadable, and has checksums. The older computers generaly would require a chip change, or a resoder. Either still is detectable because it still is software and the manufacture knows what versions they have made.
Checksums.. yes they exist, but did you know you can also program a specific checksum value to be displayed no matter what the real checksum is? You can according to Hondata. Especially with ODB2 cars, the programming changes every year. Even at the manufacturer it's hard to know what originally came on the car, most often just the most current (think supercede) program that is listed. I spent quite a bit of time this year trying to find a way to ensure Showroom Stock ECU legality (at least from Honda perspective). In the end, there was nothing feasible.