Fourtitude.com - AHU into a mk1. Drive by wire pedal compatibility question.
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    1. Senior Member vdubspeed's Avatar
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      02-06-2011 06:59 PM #1
      I'm putting an AHU into a mk1 for a friend and the drive by wire from the donor 98 Jetta TDI is massive.

      Now I have a pedal from a mk4 1.8t that also has six wires but I'm not sure if they will be compatible.

      The mk4 pedal would be WAY easy to make fit. Any advice from someone who may have invented this wheel already?

      Thanks,

      Jason
      Built > Bought
      58 Beetle | 79 Rabbit 20vT | 84 GTI TDI |84 GTI 16vT |12 Golf TDI ----89 325i | 03 2500hd 24VCummins/NV4500/NP205 | 02 Burb 4x4 2500

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    3. Member
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      02-10-2011 12:42 AM #2
      its been done. i think i found it in the swap section of tdiclub.com though.
      http://forums.tdiclub.com/showthread.php?t=142679

    4. Senior Member vdubspeed's Avatar
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      02-20-2011 08:52 AM #3
      well I just jumped in last night and figured it all out. After a few mods to the pedal itself, VAGCOM registered the pedal and showed 0 to 100%.

      Anyway...perhaps this may help someone somewhere...here is how to do it. Cut the pig-tail off the factory mk3 DBW unit. Find a donor mk4 pedal and cut the pigtail from the harness. My donor was an 01 Jetta 1.8t.

      So with the two pigtails in front of you, wire like so.

      mk4 pin # (color) -> mk3 pin # (color)
      1 - Gray/white -> 5 - Green
      2 - Yellow/green -> 2 - Pink
      3 - Grey/Red -> 3 - Brown
      4 - White/Blue -> 1 - White
      5 - Grey/Blue -> 4 - Grey
      6 - Brown/Blue -> 6 - Yellow.

      After I turned on vagcom I noticed that the pedal registered no lower than 7.5% even when adjusted to the lowest setting. I had to modify the housing on the mk4 pedal slightly to allow the potentiometer to go down to 0.0% After that the pedal showed smooth movement through vagcom.

      In the picture below you can see the massive and antiquated mk3 DBW pedal. It looks much worse that this before you cut all the metal away. On the right you see the mk4 pedal. Much nicer package. Above you can see the mk3 to mk4 plug and play harness. The left side was cut from the mk3 DBW unit and will plug right into the car. On the right of the harness is the pigtail from any DBW mk4.



      Hope this helps.

      Jason
      Built > Bought
      58 Beetle | 79 Rabbit 20vT | 84 GTI TDI |84 GTI 16vT |12 Golf TDI ----89 325i | 03 2500hd 24VCummins/NV4500/NP205 | 02 Burb 4x4 2500

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    6. Member FaithInMkIII2.0's Avatar
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      02-20-2011 09:42 AM #4
      Nice work! I used a B4 passat pedal cluster in my mK2 swap because it was pretty much a bolt in affair. The fact that you can swap plugs and use a later style pedal is awesome, just another example of the VW big kid legos analogy!
      For VW TDI modification, parts, and service check out SCHNELL SNAIL TDI PERFORMANCE yes, we do gassers too!
      Southbend clutch dealer TIG welding

    7. 10-09-2012 06:53 PM #5
      I'm a bit confused about this "pedal swap". Is it really working and has anyone else already tried and confirmed it?

      The reason to be confused is the fact that Mk4 pedal has 2 potentiometers inside and ECU is comparing the output values from both, to make the system a bit more reliable.

      Mk3 pedal is cable-connected to a dbw unit with only one potentiometer inside, the other wires are used for pedal position switch and auto transmission kick down switch. In fact on some audi-s with 1Z/AHU engine the same (Mk3) dbw unit is used with only 4 wires, 3 for potentiometer and one for position switch.

      It is clear that one of these potentiometers in mk4 pedal can be left unused, but since there is no position switch, how will it work?

    8. 01-01-2019 10:32 AM #6
      What’s the final word on this?

    9. Member corradoboy18's Avatar
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      04-09-2019 08:54 PM #7
      Quote Originally Posted by deathhare. View Post
      Whatâ€s the final word on this?
      It works

      Just did it with a diesel mk4 DBW married to the mk3 pigtail. Must be tuned to work right




      Sent from my Pixel 3 using Tapatalk
      "If there's a fork in the Road...take it." Yogi Berra

      VWs long gone in my life (from 1st-last): "92 Corrado, 67 Bug, "91 GTI 8v, '90 Corrado G60, '71 Bug, '93 Corrado (Pristine), '88 Scirocco 16v, and an '81 Golf 1.7L 3spd auto 4dr. All are gone, all are missed

    10. 04-22-2019 12:29 PM #8
      Quote Originally Posted by corradoboy18 View Post
      It works

      Must be tuned to work right




      Sent from my Pixel 3 using Tapatalk
      In what way?
      Thanks

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