OBD2 protocol

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Hi there,

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.

Thanks,

Michael

Michael.

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Does no one use Google anymore?

First hit

Go electric!
Happy electric car owner / builder

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Ok,

This is a very nice link.

Thanks,

Michael

Michael.

User of:
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Altium Designer

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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)

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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.

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How did you find this thread??????

Michael.

User of:
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http://www.scantool.net/

The ELM chip, an obdII interpreter..

Regards,

Bruno Muswieck

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I have two of the scanners mentioned from ACTRON. The baud rate is very slow and it appears to be single ended(not balanced).

Jim

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Quote:
The ELM chip, an obdII interpreter..

Yes I bought one, and I found that a PIC is hiding behind the yellow label. Ha ha ha......

Michael.

User of:
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Altium Designer