Help me build an OBD II scanner for reading diagnostics from auto computers

[johnyaya]

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

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

 

[alileo]

diy obd2 scanner

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

 

[Kemosabe]

obd ii diy

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]

diy obdii

Hi

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

I hope this helps

 

[NikZetaJones]

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]

diy obd ii reader

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

stinsen

 

[NikZetaJones]

obd2 scanner diy

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

 

[stinsen]

pic16f84 obd

I only have it in swedish
pm me if you still want it

 

[meax98]

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:

**broken link removed**
https://www.elmelectronics.com/DSheets/ELM320DS.pdf
https://www.elmelectronics.com/DSheets/ELM322DS.pdf
https://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]

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]

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]

diy obd reader

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

 

[mgajo]

odb ii diy

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

Bye

 

[nickich]

obdii pic16f84

I prefer to communicate at nickich@abv.bg

 

[Nick C.]

make obd scanner

nickich,

Remind me never to buy a used car from you.

:x

 

[2000]

obd scanner diy

hello friends,

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

regards,

2000

 

[nickich]

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]

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 https://obddiagnostics.com realized with a PIC16F84 (see scheme in attachment).

Bye.

 

[gelly]

16f84 obd

hi,

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

does anybody knows where to dl it ?

greetz,
gelly

 

[mgajo]

diy obd ii interface

Hi
chip is copy protected !!! 8O

bye