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Thread: diagnostics

  1. #1
    Newbie
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    Feb 2001
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    Post diagnostics

    this isn't exactly mp3 related, but it is carputer related.. has anyone set up something for diagnostics through an OBD II port?
    _purei

  2. #2
    Constant Bitrate
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    Post

    Not yet but I have the cable to connect to it and the software but I dont have any free serial ports in my plans for it yet (and my computer is not in my car right now anyway :-( ) so I guess right now it is more of a troubleshooting tool then Diagnostics right now.... hummmmmm maybe I need to add a few more serial ports to my computer

  3. #3
    Low Bitrate
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    Post

    Maybe this page has something you're looking for.

    http://www.obdii.com/

  4. #4
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    aye. i had that site open as i was writing the post, actually. it gives alot of info on buying standalone tools, but i couldt find much about hooking it straight to computer.

    <font face="Verdana, Arial" size="2">Originally posted by Fourgig:
    Maybe this page has something you're looking for.

    http://www.obdii.com/
    </font>
    moxnix: where did you find the cable? or.. uh.. how did you build it? i think i'm going to be doing a bit of, er, trailblazing as i'm wanting to connect this to, and run this from a g3 powerbook'd carputer.
    _purei

  5. #5
    FLAC DodgeCummins's Avatar
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    I saw something on TV...The Shadetree Mechanic show on TNN.

    A company was selling the cable and software (winOS)...but as I remember it was VERY expensive...in the $500 range I think.

    On the otherhand I think the software would interface with ANY onboard computer.

    ------------------
    http://www.geocities.com/mr_bubba_zanetti/

  6. #6
    Variable Bitrate
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    The Autotap hooks up to a system through serial port and you can run their own software or im sure you could program your own...

    Scan tools always have been probably always will be expensive.. but its definetly a neat feature to add on..

    http://www.autotap.com/autotap.html
    MP3 Cavalier - http://www.mp3cavalier.com
    MP3 Grand Prix - http://www.mp3gp.com

  7. #7
    Constant Bitrate
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    well I think you will find this price a little better than the $500 I got mine oas part of a group buy from http://www.obd-2.com/ and I got the "TRIPLE COMBO - contains all three gateways for use on all vehicles $162 Only one cable and connector needed, combo router box selects correct vehicle." for about $97 so if you are interested you might want to try getting a group buy going either with an mp3car group (if anybody else would be interested in it) or if you belong to a group of people that have the same type of car as you or are just into their cars (or both) to bring that price down (also notice there is a %25 discount for full time students (only off the regular price I think) if you are thinking about just going ahead and buying it my cable connects thru the serial port to a standard IBM-PC compatable computer.

    I dont know what else the other more expensive cable can do and saddly to say have not even used this cable yet :-( but I am sure I will use it sometime if nothing else then just to say that I have

  8. #8
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    Talking

    anyone know of a way to display gauges on my pc with my 1980 chev truck its got a 1980 v8 350 in it its not the factory motor but there not computer built into the motor. I was hoping to find a way to get rpm,heat and speed and a few other gauges on a 5" lcd that i will wire separate just for gauges,
    &lt;p align="center"&gt;&lt;a href="http://www.mobilemediacentral.com"&gt;&lt;img border="0" src="http://www.mobilemediacentral.com/images/logos/mmclogo.jpg" width="171" height="151"&gt;&lt;/a&gt;&lt;/p&gt;

  9. #9
    Retired Admin Aaron Cake's Avatar
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    Thumbs up

    You can get the sensors required from Dakota Digital at http://www.dakotadigital.com. You will then need an analogue to digital converter (hint: what do you think a sound card is?) to read the values. A little custom programming and you're laughing. Sounds like a cool idea.

    ------------------
    Aaron Cake
    London, Ontario, Canada

    Player: Cyrix 200, 32MB RAM, 10.2Gig Quantum HD, Onboard EtherNet/Sound/Video, Custom Lexan Case, Arise DC-DC, Win95 Kernal w/Custom Player
    Car: '86 Mazda RX-7 w/Basic Performance Upgrades
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

  10. #10
    Variable Bitrate
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    Auto salvage yards (junk yards) are also good places to find various sensors. You can get MAP (Manifold Absolute Pressure) sensors as well as various other sensors from any modern, computer-controlled car. I've thought about doing this for my 1970 Camaro before too. Another good place to check is Summit Racing or Jeg's. They sell replacement sensors for some of the gauges they sell.

    But, like Aaron said, you'll need some custom hardware and/or software to make it work. You can find pre-made multichannel A/D converter boards at various companies. Just go to www.google.com or similar and do a search.

    Most of the sensors (temperature, vacuum, etc.) are just an analog voltage that you sample to get a digital value. Then you can draw a gauge in your custom software, or plot the value over time on a graph.

    For vehicle speed and RPM, you may need a unit that can sample frequency, or a frequency-to-voltage converter. The simplest way is to use a magnetic or inductive pickup on the wheel or driveshaft. For RPM you can digitize the tachometer output from the distributor or ignition box, or mount a pickup somewhere on the engine or transmission.
    Jason Johnson
    Yorba Linda, California
    http://www.m2pc.com

    MPC Phase IV - *** PENDING ***

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