computer to get all engine diagnostics?

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total_overkill

Copper - Posts: 93

Joined: November 24, 2005

Location: Canada

Posted: December 31, 2005 at 2:27 AM / IP Logged

I have a degree in computer programming. Can you use computer code and the hookup in the car and get all engine diagnostics. Is there one already out there Hooks into onboard laptop?

The programming languages I know are C, C++, Visual Basic, And I am quite sure Access wont help me unless I want to know my gas\mileage ratio. LOL

40 grit has saved my life sometimes =[

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geepherder

Platinum - Posts: 3,668

This member consistently provides reliable information

Joined: October 27, 2003

Posted: December 31, 2005 at 6:58 AM / IP Logged

You have to use a program designed to interface with the on board computer. Then you can hook up your lap top. As far as I know, they do not use common pc programming languagaes.

My ex once told me I have a perfect face for radio.

KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: December 31, 2005 at 10:29 AM / IP Logged

If the car is newer then a 1995 it should be OBDII compliant. OBDII is a universal OnBoard Diagnostic protocol that is universal. They make OBDII chips to communicate to the cars computer, you may be able to write something to move that data on to a laptop.

Kevin Pierson

techguy688

Copper - Posts: 55

Joined: November 07, 2004

Location: United States

Posted: December 31, 2005 at 4:59 PM / IP Logged

They make OBD II readers that interface with software in a Microsoft Window opearting system http://obddiagnostics.com/. Is this what you were looking for . It connects to the OBD connector in the vehicle and into a serial port on a laptop.

Just because you've done something for a long time doesn't mean you're any good at it.

Cable Ties Rock!

leoslocks

Member - Posts: 6

Joined: December 28, 2005

Location: United States

Posted: January 09, 2006 at 9:58 PM / IP Logged

Here are some links about the up coming J2534 Pass through system. This should cover the protocols of communication all the newer cars will utilize.

http://www.passthruxs.com/all_about_j2534.htm

http://sourceforge.net/projects/j1699-3/

http://www.dearborn.co.uk/training.htm

gus1

Gold - Posts: 1,013

Joined: October 15, 2003

Location: Canada

Posted: January 10, 2006 at 11:56 AM / IP Logged

I know there is a dandy one out there for VW's.... Vag-Com. Runs off a computer, same functionality as the stealership's scan tools, and I believe worth less than $400 for the full CAN interface (will work on all VW/Audi/etc. from 1995 to present)

It also has some limited generic OBD2 functions built into it, this will probably expand as more manufacturers adopt the CAN data system (apparently beginning 2007 MY... supposed to be an ISO standard)

Gus

Wherever I go, that is where I end up......

firstrax

Copper - Posts: 113

Joined: January 18, 2006

Posted: January 19, 2006 at 9:34 AM / IP Logged

total_overkill wrote:

I have a degree in computer programming. Can you use computer code and the hookup in the car and get all engine diagnostics. Is there one already out there Hooks into onboard laptop?

The programming languages I know are C, C++, Visual Basic, And I am quite sure Access wont help me unless I want to know my gas\mileage ratio. LOL

If you give the model and year of the car I can give you a simple circuit to interface a serial port to the OBD connector.

total_overkill

Copper - Posts: 93

Joined: November 24, 2005

Location: Canada

Posted: January 19, 2006 at 9:58 AM / IP Logged

1997 grand am SE

thanks

40 grit has saved my life sometimes =[

firstrax

Copper - Posts: 113

Joined: January 18, 2006

Posted: January 19, 2006 at 9:32 PM / IP Logged

total_overkill wrote:

1997 grand am SE

thanks

Then you have a VPW (variable pulse width) system. Its a one wire system.

A logic 1 is a passive line for a period of 128us or an active line for a period 64us.

A logic 0 is the exact opposite.

No start bits or stop bits, just data bits with no interbyte spacing.

Typical data request would be: 68 6A F1 01 05 (Requests coolant temperature).

SAE documents J1979 (codes) and J1850 (protocol) will have everything you need. computer to get all engine diagnostics? -- posted image.

fuseblower

Silver - Posts: 403

Joined: June 25, 2003

Location: United States

Posted: January 20, 2006 at 4:31 PM / IP Logged

This computer system connects to your OBII as an option. You can probably do some additional programming and get the system to do what ever you want it to.

http://www.drivesoft.net/

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