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

[Richard J Lebens]

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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