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Thread: Is scantool really necessary?

  1. #1
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    Question Is scantool really necessary?

    Ok, to get OBD-II information we need a scantool (or something similiar), that connects to the computer and to the connector in the car. As I see it the scantools are basically just specialised computers that perform a task.

    Now instead of having the scantool do the processing, isn't there a way to connect directly from the car to the compuer, maybe some sort of DIY connector, and have some piece of software to do all the reading.

    I don't pretend to understand all this stuff but isn't the OBD-II port just sending and maybe receiving information, and all we need to do is read it. Unless there are some electrical issues that I don't know about, like having to use resistor and capacitor (IC stuff, btw don't know anything about electrronics).

    Oh and if this is all crap then tell me , its just been going round in my head and kind of bugging me right now. I'd love to here your thoughts on this.
    Affie

  2. #2
    See me in my wet t-shirt. stevieg's Avatar
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    Quote Originally Posted by affie
    Ok, to get OBD-II information we need a scantool (or something similiar), that connects to the computer and to the connector in the car. As I see it the scantools are basically just specialised computers that perform a task.

    Now instead of having the scantool do the processing, isn't there a way to connect directly from the car to the compuer, maybe some sort of DIY connector, and have some piece of software to do all the reading.

    I don't pretend to understand all this stuff but isn't the OBD-II port just sending and maybe receiving information, and all we need to do is read it. Unless there are some electrical issues that I don't know about, like having to use resistor and capacitor (IC stuff, btw don't know anything about electrronics).

    Oh and if this is all crap then tell me , its just been going round in my head and kind of bugging me right now. I'd love to here your thoughts on this.
    Affie

    The product from www.scantool.net is available as a DIY kit for people thinking the same as you - it's probably the closest you'll get to what you are looking for remember you do need isolation between the ECU and the PC for safety reasons
    Ford Focus MP3 : www.stevieg.org/carpc Blog Updated 29 January 2009!
    Car PC Status: Complete - Undergoing Software Redevelopment

  3. #3
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    Thanks guys, I guess it was just wishful thinking (and me bieng a cheapskate ). I can finally put this one to rest and thanks for the DIY info on the scantool.net site.

  4. #4
    See me in my wet t-shirt. stevieg's Avatar
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    Quote Originally Posted by joshthepilot
    Well in your example, you do need isolation, its called an elm chip which is an MCU.
    Yes thats what I was saying
    Ford Focus MP3 : www.stevieg.org/carpc Blog Updated 29 January 2009!
    Car PC Status: Complete - Undergoing Software Redevelopment

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