OBD11 Scanner

datacps

I was wondering is there any information on OBD11 using an SX Chip. I want to make a simple scanner to display and erase DTC on automobiles·for my students using an SX Chip.·I was wondering if someone can point me in a direction. I looked and did a search on this site and nothing came up. I see there are a lot of scanners out there but I would like to build one with the SX chip.

Thanks

Brian_B

datacps,
·Not to correct you but it's OBDII not OBD11 :-) . If you do a search using " OBDII ISO" ,you should find some good info. Here is one that I found.

http://en.wikipedia.org/wiki/On-Board_Diagnostics


Good Luck,

·Brian

John Couture

Here is an interesting research project that uses a GPS and an OBD II to create a small display for the car.· Too complex and expensive by todays standards but it does give some interesting background information on the technology. http://ece.uakron.edu/SDmaterial/spr2003/SDteam4.pdf

Scantool.net sells PDIP8 chips that can talk to your car's MCU.· They also have free laptop software to enable you to talk to the chip and make changes to your car's MCU.

The SX chip could be used in place of a laptop and run an LCD w/ buttons for the human interface.· Could be a fun project!

www.scantools.net
- products
- parts

take a look at the OBD Interpreter ELM320 ($17.95) or similar chip.

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John J. Couture

San Diego Miramar College

DynamoBen

John Couture said...

Scantool.net sells PDIP8 chips that can talk to your car's MCU.· They also have free laptop software to enable you to talk to the chip and make changes to your car's MCU.

take a look at the OBD Interpreter ELM320 ($17.95) or similar chip.

Scantool.net doesn't make those ICs they are made by Elm Electronics:

http://www.elmelectronics.com/

The ELM327 is worth a look also. I've used their ICs in projects before, makes life simple and they work well.

Post Edited (DynamoBen) : 8/3/2008 11:33:34 PM GMT

CounterRotatingProps

datacps,

there was a thread sometime back about this that didn't really go anywhere. I'm looking into this too (but only for two vehicles [noparse]:)[/noparse]

Second John's suggestion of the ELM products that would make interfacing to any controller much easier. The site DynamoBen posted has a good cross ref too.

cheers
- H

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Buzz Whirr Click Repeat

datacps

Thank you gentlemen for your response. I looked at all the information and I also found SJA1000 chip for 5 dollars. I think I will use one of the ELM chips and the SX48. I will get busy and post my board and info as I go along. I found a schematic that will help me too. I will post what I come up with. I think this will be fun...

DynamoBen

Keep in mind that the schematic you posted is for CAN bus. There are a total of 4 OBDII communication methods it depends on the car.

steve_b

The ELm chips come with interface circuit diagrams so you should be ok there.
I picked one up a couple of years ago and was able to talk to the chip with my laptop, but I never did get around to wiring it up to my Jeep (was winter up here in Canuck-land!).

Are you planning on getting the proper connector? Let me know where you get yours!

Cheers

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<FONT>Steve



What's the best thing to do in a lightning storm? "take a one iron out the bag and hold it straight up above your head, even God cant hit a one iron!"
Lee Travino after the second time being hit by lightning!

RobotWorkshop

I'll have to checkout the latest version with the CAN bus. I think that is what my 2008 Chevrolet uses. It would be pretty cool to find out if the parameters of the on board computer can be tweaked by using that connector and protocol. Supposedly mine is throttled back by the computer and there is an extra 50HP just waiting to be tapped. I guess I'll have some fun with it once the warranty expires...

Robert

DynamoBen

As far as cables I purchased mine here:

http://www.obd2cables.com/products/

In regards to changing settings in the ECU, the Elm ICs are designed to do just diagnostics (clearing/reading code, reading onboard sensors).

datacps

Thanks again guys,, I am looking into just using ther SX chip to do everything.
I am reading the data sheets on and it looks like the SX48 may be able to do it all without the ELM chip...
I found some good info to start with.. They are using an AVR chip for this scanner but I think the SX may be able to do it too..

John Couture

There are some pretty·inexpensive·OBD II readers on the market.· Here is one from·Harbor Freight http://www.harborfreight.com·search for item # 94168.· Its only $40 complete!

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John J. Couture

San Diego Miramar College

datacps

The unit I am building for my students will have injector and ignition test functions. I will also have PID data display and I will also try to add CAN. I think the sx48 can do it all. I will at least try it. I already have the Injector Pulse and ignition pulse done. I have PWM I just got to put it all together and see·how I can set up an auto buad set up to com with the ECUs. I will post as I go along. ·Thanks