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Thread: Vehicle Speed Shows 5 km/h while standing still

  1. #21
    Ross-Tech Employee Eric's Avatar
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    I'd do a physical request to the trans (address 7E1, response should be at 7E9) with PID 0x0D. Only the trans will respond. As for the source of what it responds, I don't know. If I were in VAG's shoes, I certainly wouldn't bother with software to independently compute vehicle speed from the output shaft speed (which requires the transmission be coded for the various wheel diameters in all its applications), I'd read it over CAN just like the ECM does. But then again, I'm French, not German The good news is you should be able to tell right now, by using the OBD2 mode of VCDS while at speed. That should get you both speed from the engine and speed from the DSG, and let you decide if what you get from the DSG is worth rebroadcasting.
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  3. #22
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    Quote Originally Posted by Eric View Post
    I'd do a physical request to the trans (address 7E1, response should be at 7E9) with PID 0x0D. Only the trans will respond. As for the source of what it responds, I don't know. If I were in VAG's shoes, I certainly wouldn't bother with software to independently compute vehicle speed from the output shaft speed (which requires the transmission be coded for the various wheel diameters in all its applications), I'd read it over CAN just like the ECM does. But then again, I'm French, not German The good news is you should be able to tell right now, by using the OBD2 mode of VCDS while at speed. That should get you both speed from the engine and speed from the DSG, and let you decide if what you get from the DSG is worth rebroadcasting.
    With VCDS at speed, and without my additional coding in my can module calculating speed, ECU shows fixed at 5 km/hr and the DSG vehicle speed shows actual vehicle speed in km/hr.


    I just tried 7E1 and response was indeed 7E9 with speed showing correctly! Well, at least from the cursory look at the data so far.
    This may be the answer to my problem... Thanks Eric!
    Last edited by da40flyer; 06-18-2017 at 04:37 PM.

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  5. #23
    NostraJackAss Jack@European_Parts's Avatar
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  6. #24
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    That appears to have done the trick! We coded in a request for the DSG vehicle speed and then rebroadcast it out as the ABS wheel speed. Seems to work well. Will know better once I get her back out on the track, but the street testing seems to work just fine...

    Thanks again everyone!

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