Question on the DBW system on the 1.8T

767 Views 7 Replies 3 Participants Last post by 1.BillyT, Apr 10, 2002

forced fed

Discussion Starter · Apr 4, 2002

I thought I would post this to see if anyone might have experiance with this. I have a 2000 Jetta 1.8T (EC: AWD) in my 98 GTI. It is Drive By Wire. (DBW) I have had this situation since the swap, but have not paid to much attention to it. more or les have gotten used to it. When I lift off the accelerator Pedal when i go to shift and step on the clutch, the engine will continue to rev up. It almost seems like the throttle plates are not closing quick enough. I can get it to do it minimul, but it just doesn't seem right. glitch in software, bad component?? Doess anyone have any insight on this???
chris

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scotty_passat

· #2 · Apr 4, 2002

Re: Question on the DBW system on the 1.8T (forced fed)

maybe a TB adaption using vagcom would help? Any codes?

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1.BillyT

· #3 · Apr 4, 2002

Re: Question on the DBW system on the 1.8T (forced fed)

There is a switch on the clutch pedal, well, there are two actually. One tells the ECU that the clutch is depressed and lets you start the car. The other keeps the TB from doing exactly what you described. I can't tell you how it works, or why it is there (I have theories), but if it isn't there, the motor will keep revving when you shift.
I swapped out my clutch master cylinder and found out about the button. For some reason when it went back together, the pedal arm didn't hit that switch. I was completely clueless. I just got back under the dash and started rooting around, and found a button that looked like it was supposed to be touching something but wasn't. Made the button touch the pedal arm, and it fixed the problem
I wish I could tell you exactly what you need to do to fix it. If you didn't get that switch from your donor car, you are gonna need it. Not so much the button, but the wiring that goes with the button. It isn't listed in the Bentley. I found it in the diagram for the pedal assembly on the Etka CD. It was called the throttle control switch, or clutch control switch, something like that.
Hardly anybody knows that little button even exists.

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1.BillyT

· #4 · Apr 4, 2002

Re: Question on the DBW system on the 1.8T (wolfsburg_de)

I would have never thought to look under cruise control...
I will check it out. Just for kicks...

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forced fed

Discussion Starter · #5 · Apr 4, 2002

Re: Question on the DBW system on the 1.8T (1.BillyT)

oh my...thanks billy my day just got so much better!!!!
wolfsburg_de.... valuable info!!! thank you
I knew it had to be something simple, i am looking into it as we speek thank you!!!!! Its funny how i learned to move my feet quickly to keep it from reving...a whole summer worth of practicing. LOL
Chris http://****************.com/smile/emthup.gif http://****************.com/smile/emthup.gif

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1.BillyT

· #6 · Apr 9, 2002

Re: Question on the DBW system on the 1.8T (forced fed)

I drove mine like that for a day or two. Absolutely hated it! Makes it hard to shift when the car keeps reving into the limiter.
Let us know how it turns out.

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forced fed

Discussion Starter · #7 · Apr 10, 2002

Re: Question on the DBW system on the 1.8T (1.BillyT)

I found the switch, it was on my pedal...

now i am waiting for the wire connector and the wires to come in at the dealership. will be very easy to wire in!!! I am so happy to have gotten this tip. Thanks again!!
I will post when I get it hooked up.
chris

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1.BillyT

· #8 · Apr 10, 2002

Re: Question on the DBW system on the 1.8T (forced fed)

cool, glad to hear it.
Difference is night and day. You won't know what to do with your self when the revs drop

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