RE: [opendiag] More info...

S4 turbos can be made to spool up in neutral, but function would not be
linear with pedal position. With ignition on, but engine NOT running, do
you get any signals? If so, and they still change with pedal position, then
it probably is pedal position. Perhaps the new VW diagnostic system
"overrides" that signal to control throttle for diagnostics?

Jim

-----Original Message-----
From: Jeff Noxon [mailto:jeff-opendiag@...]
Sent: Thursday, July 27, 2000 1:57 PM
To: opendiag@egroups.com
Subject: Re: [opendiag] More info...

Fascinating. It must be a new "feature" ... It would not be boost,
because your turbo won't spool up at idle (no engine load.) It may be
throttle position. Does it work when the motor isn't running?

Regards

Jeff

On Thu, Jul 27, 2000 at 05:52:36PM -0000, blg@... wrote:
> Hey-
>
> I put a scope on these two pins (1 & 13) and found that pin 1 seems
> to
> float up around battery voltage while pins 13 has a PWM signal with a
> frequency of about 100 Hz. The pulse width is somewhere around a
> couple of hundred microseconds at idle, and widens when I press the
> throttle. I don't know if it is throttle position (this car is drive
> by wire) or engine speed, or boost, or what.
>
> Ring any bells?
>
> Brian

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Received on Thu Jul 27 12:56:11 2000