CAN or "Candi" as is the common term is a completely different type of communication between different modules in a vehicle. CAN stands for "controller Area Network" It is the way which modules having the CAN wiring are able to communicate high speed information. It is totally different than the OBDII Which is STILL in use, and in most cases, works side-by-side with CAN. However the CAN network and OBDII network are on different communication wires, and are NOT interactive. The details would get too lengthy to try and describe here, so if you were a little more specific in what you need to know I would be glad to try and help.
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"It is not that I have failed, but that I have found 10,000 ways that it DOESN'T work!" --Thomas Edison
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