code dump - code 2111 speed sensor + RPM & Hall interoperation

[Peter Berrevoets]

In my case, I've had the 2111 code from a dead distributor hall sensor and
on a separate occasion from a damaged flywheel pin - the latter case
resulting in intermittent no-starts.

HTH

Peter

1990 200Q MC2
1989 200Q MC1 parts car
1987 Coupe GT 2.3
AAN 20V on shelf waiting patiently...

> -----Original Message-----
> From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
> Behalf Of Bernard Littau
> Sent: Thursday, September 19, 2002 12:21 PM
> To: Richard J Lebens; quattro at audifans.com
> Subject: RE: code dump - code 2111 speed sensor + RPM & Hall
> interoperation
>
>
> I hypothesize the ECU throws 2111 in at least two cases:
>
> If the ECU sees a TDC signal before (or after) the expected
> number of teeth
> go by the RPM sensor, it throws code 2111.  The car will still
> run with the
> bad signals, as the timing will likely be close enough.
>
> Or, if the ECU sees Flywheel Hall and Distributor signals, but no RPM
> signal, it can throw code 2111.
>
> The second one is very likely to occur while cranking on a no start
> situation, then pulling codes.  If the code occurs on a running
> engine, then
> I would suspect the first.
>
> I'm educated guessing here.  I haven't dealt with the 2111 on my car.
>
> As I think about it, both cases are really the same, just in the
> second one,
> the received count would be zero rather than close to the 135
> teeth number.
> So maybe the ECU throws the 2111 code in only one case, when the count of
> teeth signals between two TDC signals is not 135, throw code.
>
> Best,
>
> Bernard Littau
> Woodinville, WA
> '88 5ktq
>
> > -----Original Message-----
> > From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
> > Behalf Of Richard J Lebens
> > Sent: Wednesday, September 18, 2002 5:43 PM
> > To: quattro at audifans.com
> > Subject: Re: code dump - code 2111 speed sensor + RPM & Hall
> > interoperation
> >
> >
> > I could see it working like this but then how does it run with no RPM
> > signal?  Like with code 2111
> >
> > --- Orin Eman <orin at drizzle.com> wrote:
> > > It's like this:
> > >
> > > Timing sensor senses a single pin at 62 deg BTDC on cylinder 1.
> > >
> > > RPM sensor senses flywheel teeth.
> > >
> > > The Hall sensor defines a window in which the timing sensor signal
> > > should occur - on the compression stroke for cyl 1.
> > >
> > > Ignition timing is done by counting flywheel teeth using the 'RPM'
> > > sensor, starting at the timing sensor signal for the compression
> > > stroke
> > > on cyl 1.
> > >
> > > Broken flywheel teeth or a defective RPM sensor can screw up your
> > > ignition
> > > timing if the sensor doesn't 'see' all the flywheel teeth.
> > >
> > > For more resolution, the ECU uses both edges of the RPM sensor
> > > signal,
> > > giving resolution of 1.33 degrees.
> > >
> > > Orin.
> > >
> > > > I'm confused.
> > > >
> > > > Reference sender tells ECU TDC cyl #1 intake/exhaust or comp/power
> > > > stroke.
> > > >
> > >
> > > > > Subject: 2111 code on 97 5ktq
> > > > >
> > > > > Hello listers.......a question about code readings.
> > > > >
> > > > > 2111 indicates "RPM sensor signal not getting to Mac 11C ECU in
> > > my 87
> >  message truncated ===
> >
> >
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