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  • proper usage

    Total newb question but I had thought that OBD could pull data while the car is running.
    While looking for a local unit, the explanation mentions that the car should not be running.
    It is a elm327 unit that I've seen here and a few other places that people have mentioned.

    Is this true?

    Another question: Is the there a difference between USB and those old looking funky wintel com ports?


    * note: I bought a cheap ebay unit and I got what I paid for. lolo, at least I have extra cables.



    Thanks!

  • #2
    Originally posted by SapporoGuy View Post
    Total newb question but I had thought that OBD could pull data while the car is running.
    While looking for a local unit, the explanation mentions that the car should not be running.
    It is a elm327 unit that I've seen here and a few other places that people have mentioned.

    Is this true?

    Another question: Is the there a difference between USB and those old looking funky wintel com ports?


    * note: I bought a cheap ebay unit and I got what I paid for. lolo, at least I have extra cables.

    Thanks!

    I'm not sure how useful it would be if it only worked when the car wasn't running. It should work when the car is running.

    Short answer: They both do the same thing, but USB is faster and supports more devices.

    A serial to USB adapter will "usually" work with most devices. However, some devices look for specific signals that are present on traditional serial ports that do not always show up on Serial/USB converters.

    I've been using a "cheap" $17 ELM327 knockoff from Ebay for over a year without any problems. Really just comes down to what your interests are. If performance tuning and monitoring are important, then get a real tool and buy the good stuff from OBDPros or the guys that hang out here. If, like me, you look at it maybe once every couple of months or less, then you can go cheap. If it works, great. If not, you can buy another.

    Cheers!

    VegasGuy

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    • #3
      Thanks for the reply!

      Working while running is what I thought but a Japanese site mentioned only working while ignition was on not with engine running. lolo, I wonder if that site couldn't read english ...

      Thanks!

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