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Thread: OBD2 works with the car off not on?

  1. #11
    What can I say? I like serial. Curiosity's Avatar
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    The ELM device's USB interface is disconnecting from the PC. That has nothing to do with OBD-II compliance or anything. Have you tried plugging the OBD-II port in after the car is running? I'm still thinking it's power related. If that works, then the voltage drop durring crank locks it up.

  2. #12
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    There's a simple solution I have for you... sell the Sonata and get the i30

    Other than that I've got nothing to add.
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  3. #13
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    OBDII Disconnect

    Just a few things:
    Is the laptop powered from the car's electrical system? If so, you may have a ground loop that can have issues for USB adapters. Run the laptop on battery or powered from a separate source.
    I use AutoEnginuity and they posted this as an issue with their USB scan tool.
    Good luck,
    DNR

  4. #14
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    Yah, wait until the car is started before plugging in the OBDII cable and run laptop off of battery power, then report back.
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  5. #15
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    Quote Originally Posted by Curiosity View Post
    The ELM device's USB interface is disconnecting from the PC. That has nothing to do with OBD-II compliance or anything. Have you tried plugging the OBD-II port in after the car is running? I'm still thinking it's power related. If that works, then the voltage drop durring crank locks it up.
    Yeah I gave that a go already as per my previous post, started the car and then plugged it in and it often comes up USB device not detected:

    Quote Originally Posted by yorky View Post
    EDIT: Oh and something I noticed, if the car is running and I unplug and re-plug the USB interface it sometimes comes up USB device not detected. Which is why I thought the device was just crap but yeah like I said no issue/error with the i30.
    Quote Originally Posted by dnr250 View Post
    Just a few things:
    Is the laptop powered from the car's electrical system? If so, you may have a ground loop that can have issues for USB adapters. Run the laptop on battery or powered from a separate source.
    I use AutoEnginuity and they posted this as an issue with their USB scan tool.
    Good luck,
    DNR
    Yep I tried two different laptops, firstly one running off laptop battery, then one running off the car, same result on both

  6. #16
    Who am I? HiJackZX1's Avatar
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    Try a different Car and see what happens. When I had the cheapy OBD2, all the data lights would come on, but when the car was on it never worked. One day the whole unit stopped working. I kept getting a USB malfunction message from the PC.
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  7. #17
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    Yes as stated I tried it on an i30, worked fine

  8. #18
    Who am I? HiJackZX1's Avatar
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    Quote Originally Posted by yorky View Post
    Yes as stated I tried it on an i30, worked fine
    I missed that, my bad. I dont know if such a thing exists, but maybe you can have the ECU flashed. On my truck if I buy a reprogrammer I can flash the ECU. Maybe they have something like that for the Sonata? If you take the car to a Hyandai dealer, maybe they can flash it for you, like do a firmware update?

    Example is the firmware update for my truck, changes how the transmission shifts, adds more MPG, more HP and more torque.
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  9. #19
    What can I say? I like serial. Curiosity's Avatar
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    OK, thought you only disconnected the USB side and not the OBD-II side which would reset the ELM. It's not the ECU. Well that could still be a possible problem, but the ELM device actually stops functioning. It's not giving an error that it can't communicate with the PCM because it's dead as a doornail, kaput, tits up, going into the light...

    It's not a 24V system is it? I still think it's something with overvoltage.

  10. #20
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    Yeah I disconnected and reconnected both the ELM and USB sides when running to reset it all.

    12V system

    I do have a lot of 'other' equipment in the car (radios, scanners, the car PC etc etc) but its all off during testing and disconnected from power.

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