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nelupet
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Data inscrierii: 11/Ian/2009
Mesaje: 355
Localitate: timisoara
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 Trimis: 31/01/2009 01:04 Titlul subiectului: Opendiag OBD-II Schematics & PCB Layout |
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This page contains plans to build a device to interface RS-232 (a laptop computer) to the ISO9141-2 / ISO14230 / SAE J1962 (OBD-II) diagnostic connector on many Volkswagen, Audi, Seat, Skoda, and Subaru automobiles. It should also work on many pre-OBD-II models. It has been tested on my two vehicles, a 1998 VW GTI 8v and a 1998 VW Passat GLS.
Please note that this page does not contain software. Free software was a goal of the Freediag project. Commercial software is also available which works with this interface.
Please don't email me questions about this project.
This document is viewed by hundreds of people a day. It has helped thousands build the interface described here. The information presented here is as complete and accurate as necessary for a person of sufficient skill to build their own interface. If you require help, please seek it from a discussion group or your local electronics guru. I lack the time (and often, the ability) to answer questions. Thanks for your understanding.
Item Qty Part Number Description Application
1 3 PS2501-1-ND 1 CHANNEL OPTO COUPLER TRANS DIP COMBINED MAKES A 2501-3
2 2 2N3904-ND NPN SML SIG G.P. AMP&SWITCH TO92 T1 & T2
3 2 1N4004DICT-ND RECTIFIER GPP 1A 400V DO-41 DIODES D1 & D2
4 10 1.0KQBK-ND 1.0K OHM 1/4W 5% CARBON FILM RES R1,R2,R5,R6,R7,R9
5 5 1.5KQBK-ND 1.5K OHM 1/4W 5% CARBON FILM RES R3
6 5 10KQBK-ND 10K OHM 1/4W 5% CARBON FILM RES R4
7 5 150KQBK-ND 150K OHM 1/4W 5% CARBON FILM RES R8
8 1 P10312-ND CAP 1UF 50V ELECT FC RADIAL C1
9 1 A23279-ND 09 MSFL PLUG RA 318 (SL,FM,BL) DB9 MALE
10 1 A23305-ND 09 MSFL RCPT RA 318 (SL,FM,BL) DB9 FEMALE
Will this device work with my car?
If your car supports VAG, ISO9141-2 or ISO14230, it should work. That includes cars sold by Volkswagen, Audi, Seat, Skoda, and Subaru (1996+). Most vehicles sold by Ford, GM, or Chrysler are not electrically compatible with this interface.
More information on OBD-II and ISO standards can be found here.
Many newer cars (model year 2001+) utilize two K-lines and this device only supports one. If you'd like to contribute a schematic or other information on how to support dual K-lines, please atingere me. But don't ask me -- if you don't see the information here, I don't have it. Thanks!
Do you sell these things?
No. You can buy a complete hardware and software package from Ross-Tech at a very reasonable price.
What kind of capacitor should I use? It isn't critical. If you use a polarized capacitor, make sure you get the polarity correct. (You should be able to figure that out yourself.)
Does it really work? Yes, hundreds of people have built this thing, and it works. I suggest you replace the 140k resistor with a 150k resistor for the best results, however.
I can't find the NEC 2501-3. What should I use? There is no such thing as a 2501-3. I've simply stuck three 2501-1's together and called it a 2501-3.
In North America, you can easily find the NTE NTE-3098 (Compatibility confirmed by Dale Kirstein). Fry's Electronics carries NTE parts.
You can also try the Infineon SFH615-A2 (Compatibility confirmed by Nigel Middleton)
My OBD-II (J1962) connector only has electrical contacts in pin positions 4, 5, 7 and 16. Why is pin 15 (L-line) missing? Not every car has an L-line connection. If yours doesn't, don't worry. This circuit will still work.
My OBD-II connector has a contact for pin 4 (or pin 5) but not both. I suggest you connect the two ground pins together on the circuit board. Some cars only provide one of the ground connections.
Is free software available?
Yes, but it hasn't been updated since 2003. Check out Freediag for more information.
The Opendiag discussion group at Yahoo Groups is another resource.
Ross-Tech seems to have discontinued their free version of VAG-COM.
How do I make a circuit board? I have written a basic guide that explains how built the board in the photos. These days I use cheap PCB manufacturers in Malaysia and China. A few can even accept EAGLE files directly.
I'm interested in writing software. Where can I find technical documentation on OBD-II online? You probably want a copy of HS-3000 from the Society of Automotive Engineers. The cost is around US$240 (in 2009).
My computer doesn't have a serial port. The Keyspan USA-19HS is an excellent USB to Serial (RS-232) adapter for this application. Be aware that most other USB to Serial adapters will give you lots of trouble with this circuit. You have been warned.
I have another question that you haven't answered here. Please look elsewhere on the internet, or ask your friendly local electronics guru.
This is an early prototype. The jumper wires on the bottom are not necessary with the current board layout.
Assembly
This is the artwork used in the latest revision of the board. It is a single-layer design. If you plan to etch your own board, use the Postscript or PDF files in the files section for greater accuracy.
This picture shows component values and placement. Note that the 2501-3 is actually three NEC 2501-1 optoisolators. The Digi-Key part number is PS2501-1-ND.
Part Substitutions
The following parts are suitable replacements:
NEC 2501 Optoisolator: Infineon SFH615-A2 or NTE NTE-3098
2N3904 Transistor: NTE NTE-123AP
These substitutions have been used by others who have built this device.
in linkul urmator ai schema cablajului un soft de proiectare cablaje(eagle5)
precum si un manual de service complect pt ford escort
si softul vcds in limba romana pentru interfata vagcom
http://www.girlshare.ro/463625.8
interfata se poate achizitona de aici
http://www.diag.ro/products/vag-com/price.aspx |
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Reaper
Junior
Data inscrierii: 30/Ian/2009
Mesaje: 2
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| Trimis: 31/01/2009 01:49 Titlul subiectului: |
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| Omg deci multumesc mult cautam de aproximativ un an asa ceva. |
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bogdangepe
Junior
Data inscrierii: 06/Oct/2010
Mesaje: 1
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| Trimis: 06/10/2010 13:51 Titlul subiectului: |
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| Reaper a scris: |
| Omg deci multumesc mult cautam de aproape un an asa ceva. |
Ai reusit s faci schema?Merge? |
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