OBD II

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johnyaya

Joined: 30 May 2001
Posts: 148
Helped: 17
Location: YoyoDyne

22 Sep 2001 17:09 diy obd scanner

Does anyone have any experience building an OBD II scanner for reading diagnostics from auto computers? I would like to build one instead of buying one.
TIA

*****************************************
Please don't reply unless you have useful information to add on this post.Thanks.

alileo

Joined: 13 May 2001
Posts: 33

22 Sep 2001 18:46 diy obd2 scanner

I am also very interested in it and would appreciate to get it.
txs alileo

Kemosabe
Guest

08 Feb 2002 17:45 obd ii diy

Quote:

On 2001-09-22 19:46, alileo wrote:
I am also very interested in it and would appreciate to get it.
txs alileo

I have tons of experience, but I can tell you right now, don't get involved. To begin with, there are 4 different hardware/software protocols, 2 of which require their own proprietary chip. These chips are not available without the approval of the car manufacturers (ie Ford and GM). The other two are fairly easy to implement in hardware, but require much more complicated software, but none of it is easy (why do think the scan tools are so expensive?). If you just want to read the blink codes, get the $39.95 version at Pep Boys, but to get the real DTC's, you're better off spending the bucks for a Vetronix scan tool (don't even bother with a Snap-On).

kalico

Joined: 27 May 2001
Posts: 20

09 Feb 2002 9:10 diy obdii

Hi

Take a look at
h**p://www.obdii.com/

I hope this helps

NikZetaJones

Joined: 31 Mar 2002
Posts: 46

19 Jan 2003 16:56 how to build a obd reader

Hello,
I'm making my own scanner for VW, Audi, Seat, and Skoda. Up to now, everything is okey. I could get the DTCs from my ECU with a preliminar code, now I have to make a good scanner.
Zeke

stinsen

Joined: 13 Jan 2002
Posts: 12

23 Jan 2003 0:37 diy obd ii reader

There was an article about an OBD adapter in the november issue of Elektor. Havent built it though..

stinsen

NikZetaJones

Joined: 31 Mar 2002
Posts: 46

23 Jan 2003 0:52 obd2 scanner diy

Could you post that article? o send a link? Thank you, Zeke

stinsen

Joined: 13 Jan 2002
Posts: 12

23 Jan 2003 0:57 pic16f84 obd

I only have it in swedish Sad

pm me if you still want it

meax98

Joined: 25 Nov 2001
Posts: 445

23 Jan 2003 0:59 diy obdii scanner

I build my own version of ELEKTOR projects and it's working more than ok. Go to this link and read little bit:

http://www.elmelectronics.com/index.html
http://www.elmelectronics.com/DSheets/ELM320DS.pdf
http://www.elmelectronics.com/DSheets/ELM322DS.pdf
http://www.elmelectronics.com/DSheets/ELM323DS.pdf

These ICs are OBD to RS232 interpreter for PWM,VPW and ISO standard. This covers almost every car I know.

regards
meax98

IrfanBK

Joined: 28 May 2001
Posts: 17
Location: Karachi, Pakistan

25 Jan 2003 16:18 obdii diy scanner

Hi,
There is a site on OBD II that provides information for DIY OBD II users. Here is its URL:

http://www.obdii.com

I really liked the site. I don't know how helpful it is in implementing a reader or so, but it sure is informative.

Irfan.

nickich

Joined: 15 Jan 2002
Posts: 22
Location: Bulgaria

25 Jan 2003 16:35 obdii diy

Hello Guys!!!
Nice Forum!!

I've made my own Tester vor VAG Cars. I have most info about VAG Protocol, and over 4000 codes database! I collect information over 4 years!
I know how to change mileage and code for keys in VDO odometers.
I need to know how to read/write EEPROM, PROM.... via diagnostic socket.
I'll be very thankfull if any can help me!

Bye!
nickich

nickich

Joined: 15 Jan 2002
Posts: 22
Location: Bulgaria

25 Jan 2003 19:21 diy obd reader

... there are not usefull information on www.obdii.com for me. I need some protocol information. ...

mgajo

Joined: 15 May 2001
Posts: 347

25 Jan 2003 19:47 odb ii diy

NikZetaJones
can you upload your project about VW,AUDI,SKODA,
I will up NOV Elektor issue about OBD

Bye Very Happy

nickich

Joined: 15 Jan 2002
Posts: 22
Location: Bulgaria

25 Jan 2003 19:57 obdii pic16f84

I prefer to communicate at nickich(at)abv.bg

Nick C.

Joined: 20 Dec 2002
Posts: 184
Helped: 4

26 Jan 2003 1:50 make obd scanner

nickich,

Remind me never to buy a used car from you.

Mad

2000

Joined: 14 May 2001
Posts: 89

26 Jan 2003 4:13 obd scanner diy

hello friends,

Could you share with us the location of the uploaded files???

regards,

2000

nickich

Joined: 15 Jan 2002
Posts: 22
Location: Bulgaria

26 Jan 2003 11:36 diy obd ii scanner

Nick C,

Very funy!!!
hahaha

It cost me over 4 years to find this info! That is not a gift!
Because of this I prefer to communicate via e-mail.
If you don't estimate hard work... problem is yours!

nickich

rossi360

Joined: 19 Dec 2002
Posts: 16

03 Feb 2003 10:28 diy obd2 reader

For ISO 9141 you can start from this documentations.
For J 1850 VPW you can use Motorola's uP with Byte Data Link Controller.
Very cheap is the OBD-RS232 converter at http://obddiagnostics.com realized with a PIC16F84 (see scheme in attachment).

Bye.

Sorry, but you need login in to view this attachment

gelly

Joined: 17 May 2001
Posts: 20

04 Feb 2003 18:24 16f84 obd

hi,

what a shame that they don't give the .hex file
for the 16f84 Sad

does anybody knows where to dl it ?

greetz,
gelly

mgajo

Joined: 15 May 2001
Posts: 347

05 Feb 2003 0:00 diy obd ii interface

Hi
chip is copy protected !!! Shocked

bye

chf

Joined: 12 Dec 2002
Posts: 11

06 Feb 2003 16:53 obd-ii diy

Take a look at
h**p://www.Ross-Tech.com
h**p://www.autoelectric.ru
h**p://groups.yahoo.com/group/opendiag/

bye

Google
AdSense
Google Adsense

06 Feb 2003 16:53 Ads

Maddin

Joined: 26 Sep 2001
Posts: 165
Location: Europe

08 Feb 2003 16:56 build obdii scanner

gelly wrote:

hi,

what a shame that they don't give the .hex file
for the 16f84 Sad

does anybody knows where to dl it ?

greetz,
gelly

Unfortunately that's true. I contacted the guy who "distributes" the PIC and he told me that he wants to see $40 for the kit (including shipping costs).
Does somebody know more about how VPW has to be implemented?? Maddin

Dave

Joined: 20 Mar 2003
Posts: 1
Location: Massachusetts

20 Mar 2003 0:32 skoda obd for pc pocket

I am using the BR-3 interface to a notebook computer. I found it on the obddiagnostics website. I am working on a 1999 ford escort 2.0l with split injection. I am looking for anyone else testing a ford escort with a similar interface. I have questions about readings off of the TPS. My idle seems to drop slowly after stopping. The idle is high at 1050 rpm. My throttle position shows 20% or higher. If I remove the TPS from the intake, it drops to 11% but rpms stay at about 1050.
If you've had similar luck on a small ford or mazda, I'd appreciate hearing about it.
TIA, Dave