I would like to read and learn about the OBD2 protocol. Does anybody have any link that I could download the standard of this protocol.
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Does no one use Google anymore?
Happy electric car owner / builder
This is a very nice link.
I think it's good idea to start with some scantool and sniff what is it sending/receiving, measure timing, etc.
Here is one example: http://www.obdtester.com/obdtester+ cable http://www.obdtester.com/elm-usb
If you want something with source code, use pyOBD: http://www.obdtester.com/pyobd (download at http://www.obdtester.com/pyobd-download)
I think that there was an IEEE (possibly SAE) document that set up the initial requirements. Hopefully it's been updated. At one time it was available for $80 or so.
Isn't it wonderful that there were originally 3 different protocols to send the same information.
The US now requires use of the CAN bus for obd2 info. I believe that started in the 2007 model year. The change to CAN also mandated changes of which modes sent particular data. I don't think that it changed much in this area, but it did change some items.
Overall I find OBD2 a bit frustrating. There are multiple things to rant about, but they won't benefit this discussion.
How did you find this thread??????
The ELM chip, an obdII interpreter..
I have two of the scanners mentioned from ACTRON. The baud rate is very slow and it appears to be single ended(not balanced).
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