Talk:On-Board Diagnostics

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[edit] Time for a new category?

With all the different onboard computer systems used in automobiles since the early 1980s, they should be collected under their own category.

There's OBD-II, OBD-I, Ford's EEC-IV and others used prior to OBD-I as well as all the systems used in other countries.

[edit] What is diagnosed, and how?

I would like to see a list of diagnostic systems, and the functions of each. It would also be nice to have an explanation of how they work and how to perform the diagnostics.

[edit] Legislation?

This page needs more info on the legislation and history which lead to adoption of OBD... from what I understand it was originally required by California emission control legislation, and later became a national requirement. KWH 03:58, 13 May 2006 (UTC)

My understanding was that the CARB required OBD (and later OBD-II) for all vehicles sold in California, and it didn't make sense for manufacturers to make different versions for California and the rest of the US, so they just incorporated it into all of their vehicles. Mouser 03:10, 15 May 2006 (UTC)

[edit] CAN bus before 2004

The article says: Vehicles sold in the United States were not allowed to use CAN for diagnostics prior to model year 2004. Is this really true? I believe my cars (two are 1999 models) use CAN for diagnostics. Can someone point to the legislation that does not allow this? --Mikeblas 07:05, 28 May 2006 (UTC)

Modifications to Malfunction and Diagnostic System Requirements for 2004 and Subsequent Model-Year Passenger Cars, Light-Duty Trucks, and Medium-Duty Vehicles and Engines (OBD II), Section 1968.2, Title 13, California Code Regulations
(3.4) ISO 15765-4. This protocol shall be allowed on any 2003 and subsequent model year vehicle and required on all 2008 and subsequent model year vehicles. All required emission-related messages using this protocol shall use a 500 kbps baud rate.
Vvmaks 18:40, 7 July 2006 (UTC)

[edit] External Links

This article seems a little heavy on external links. Wikipedia isn't a shopping guide; so should these be removed? -- Mikeblas 02:40, 10 June 2006 (UTC)

They definitely need to be removed. Also, the links to DTC listings should be moved to the [Table_of_OBD-II_Codes|appropriate page]. I'm planning a major re-write of this page, as it is in dire need of repair, but I keep having to put it off. I may get to it this weekend; if I start the re-write, I'll post here to request that people hold off on modifying it for a few hours. Mouser 15:37, 10 June 2006 (UTC)

...and 10 minutes later... I'm doing the re-write now. It will take me an hour or two at least, and all sections of this page will be mostly re-written. Please refrain from editing this article until 18:00 UTC today if possible. Thanks! Mouser 15:47, 10 June 2006 (UTC)
OK, my initial attempt at a complete overhaul is now live. Have at it. Mouser 18:07, 10 June 2006 (UTC)
Yay for Mouser!! Thanks! I tidied up a couple of links and I'll make a copyedit pass. What you've done is awesome. -- Mikeblas 20:00, 10 June 2006 (UTC)

[edit] Links to your favorite scan tools and related products

Wikipedia is not a repository of links; please resist the temptation to post a link to your favorite scan tool in the article. I have moved all of the links to specific scan tools and software from the article to here. Feel free to add a link at this location.

[edit] Commercially available scan tools

[edit] Software

[edit] Link Farm

Wikipedia is not a link farm. Please stop adding links and reverting the deletion of the table of links. Edit it here, if you'd like. -- Mikeblas 15:10, 26 June 2006 (UTC)

MikeBlas, here are some more link farms for you to change FPGA Graphic_design Flash_Memory just to name a few, I'll find more if you'd like. —The preceding unsigned comment was added by 68.32.84.207 (talk • contribs).

Thanks for the pointers. I had a look at Flash Memory, and it had only one commercial link so I removed it. I left a note in the FPGA topic about cleaning it up, but I haven't had time to check out Graphic Design. You might want to do it yourself -- you can edit it just like you've edited this article. There's a great article on the meta site about when you should link externally, and will help you understand what links are appropriate. -- Mikeblas 03:29, 6 July 2006 (UTC)


No thanks, I'm done contributing to wikipedia. People add incorrect info, such as OBD 1.5, which is a slang term for OBD-1 with an OBD-2 connector, not a protocol. It still uses the OBD-1 protocol, not OBD-2. That incorrect info stays. Useful information is shunned. That shows this place is too inaccurate to be of any use for dealing with engine/powertrain computers. There is much more useful information out there that could make this article incredibly useful (not links) and its staying out there. —The preceding unsigned comment was added by 68.32.84.207 (talk • contribs).
That's too bad. Wikipedia is what you make it. -- Mikeblas 18:56, 7 July 2006 (UTC)

[edit] Scan Tools

This section is pretty bad -- no exposition of the subject, and POV. How are PC-based scan tools less expensive -- I suppose that's assuming you have a portable computer already? Are all stand-alone scan tools incapable of reprogramming, and if so, why? Where's the "advantages of stand-alone scan tools" -- surely there must be some?

A few links to examples of each kind would be good too, which would probably be external links.

-- jhf 04:41, 16 November 2006 (UTC)

[edit] Environment

Is it not mentioned, that OBDII is only used for Environmental reasons?

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