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

[Orin Eman]

2111 doesn't necessarily mean the sensor is completely dead.
It can also mean that there is a flywheel tooth missing ie. it gets the
wrong count between two signals from the timing sensor.  It will still
run, but timing will be retarded after the missing tooth.

Orin.

>
> 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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