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Drive-by-Wire

Discussion in 'A4/S4 forum(B5 Chassis)' started by jdp1962, Apr 4, 2004.

  1. jdp1962
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    jdp1962 Grumpy Old Moderator Staff Member Moderator

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    [Apr 4, 2004]
    I want to check whether my A4 (1999 post-facelift 2.8 Quattro Tiptronic) has a drive-by-wire throttle system. What do I look for?

    It might sound a bit obvious, but it's never a stupid question if you'd don't the answer

    Hope someone can help

    JEFF
    #1
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  3. excursion
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    excursion Member

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    [Apr 4, 2004]
    DBW cars had the CAN bus, which means you'll have a digital clock on your tacho /ubbthreads/images/graemlins/smile.gif
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  4. Mutinyno9
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    Mutinyno9 Member

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    [Apr 4, 2004]
    I was wondering why i got shafted with the non-digital clock
    #3
  5. DavidR
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    DavidR Active Member

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    [Apr 4, 2004]
    [ QUOTE ]
    excursion said:
    DBW cars had the CAN bus, which means you'll have a digital clock on your tacho /ubbthreads/images/graemlins/smile.gif

    [/ QUOTE ]

    Digital clock does not equal CAN bus... The A3/A4 from 1999 had digital clock but no CAN bus.

    Best way to check for DBW is to look at the intake plenum on the engine for a sign of a cable /ubbthreads/images/graemlins/smile.gif
    #4
  6. excursion
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    excursion Member

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    [Apr 4, 2004]
    Digital clock defiantely equals CAN bus. CAN & digital clock introduced 8/99, very few cars for 99 mostly all 2000. (You see a lot of 1999 facelift A4's with the analogue clock)

    There are a few facelift cars that didn't have DBW and CAN, ones to get as respond well to tuning but have the facelift extras.
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  7. jdp1962
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    jdp1962 Grumpy Old Moderator Staff Member Moderator

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    [Apr 4, 2004]
    Mine's a 99 T-reg (I think it was July), and it has an analogue clock. The reason I want to know is that Fontain do a OEM cruise control retro-fit for £350, but it's only for DBW cars.
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  8. excursion
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    excursion Member

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    [Apr 4, 2004]
    Confusing! 3 totally different combinations.

    Facelift: Analogue clock
    Facelift; Digital clock, non DBW, non CAN
    Facelift; Digital clock, DBW & non CAN

    I give up! lol
    #7
  9. Anito
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    Anito Member

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    [Apr 4, 2004]
    Looking at the manual it seems all cars from 99 onwards had electronically-operated throttle valve.

    I can also find reference to cars from 96 onwards having Throttle position sensor whihc suggest to me that these cars had DBW also.

    I'll do a bit more digging
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  10. Anito
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    Anito Member

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  11. DavidR
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    DavidR Active Member

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    [Apr 4, 2004]
    [ QUOTE ]
    Anito said:
    I can also find reference to cars from 96 onwards having Throttle position sensor whihc suggest to me that these cars had DBW also.

    [/ QUOTE ]

    TPS has nothing to do with drive by wire.
    #10
  12. excursion
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    excursion Member

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    [Apr 4, 2004]
    An automatic may have some kind of throttle kicker solenoid, but no 96 had DBW. The earliest to have DBW was the S4, on Motronic management in 1998.
    #11
  13. jdp1962
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    jdp1962 Grumpy Old Moderator Staff Member Moderator

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    [Apr 4, 2004]
    Thanks for the input, guys. I guess the only way to be sure is to get my head under the bonnet, remove the plastic hoardings & look for a throttle cable into the injection system.
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  14. excursion
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    excursion Member

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    [Apr 4, 2004]
    Jeff - take a pic of your engine bay for me, and the T/B area
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  15. jdp1962
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    jdp1962 Grumpy Old Moderator Staff Member Moderator

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    [Apr 4, 2004]
    [ QUOTE ]
    excursion said:
    Jeff - take a pic of your engine bay for me, and the T/B area

    [/ QUOTE ]

    Cool! It'll be a day or two before I can do that, but cheers, pal. /ubbthreads/images/graemlins/beerchug.gif
    #14
  16. Anito
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    Anito Member

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    [Apr 7, 2004]
    Just got this back from someone else on another forum

    "1.8T went to DBW in 2000. 2.8 went to DBW in 99.5. S4(2.7T) was always DBW"

    #15
  17. Patrick
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    Patrick Member

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    [Apr 10, 2004]
    My 2p. My last 1997 S4 didn't have a digi clock but it was DBW. but then that's standard for the 2.7 twin turbo engine.
    #16

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