[urq] reference sensor bench testing

[Peter]

The pin moves a magnet in the sensor. An ohm meter won't pick up the signal
of the pin. You need a scope to see the differential. Make sure you get one
to do the testing before you go any further. I/we have been down this road
before with Dennis Graber's 20V. After everything was said and done we found
that somewhere between the flywheel mark (through the crank, through the
crank timing gear, through the timing belt, through the cam ) to the timing
mark on the distributor had lost 3 or 4 degrees even though the marks said
both were on top dead center.  We kept thinking it was the reference sensor
because of the readings. We eventually advanced the distributor a couple of
degrees and the car fired right up. As we speak; Dennis is trying to find
out where the slip happened.

Regards,

Peter



On Sat, Aug 29, 2009 at 5:08 PM, Mike Del Tergo <mdeltergo at hotmail.com>wrote:

>
> Ingo,
>
> I had thought that the reference pin swinging by generated and electrical
> field of some measurable output and thought there might be another way to
> generate a field and measure.  I will Ohm the unit for starters.
>
> Thx
>
> Mike
>
> > To: mdeltergo at hotmail.com; urq-bounces at audifans.com; urq at audifans.com
> > Subject: Re: [urq] reference sensor bench testing
> > From: ingo.rautenberg at gmail.com
> > Date: Sat, 29 Aug 2009 22:02:19 +0000
> >
> > It's basically the same for as for the V8, 5ktq, etc.
> >
> > I forget the order, but there are 3 pins in the connector and the center
> pin -- when connected to one of the side pins with a multimeter should ohm
> out to 1k ohm. If it doesn't, it's bad. Sometimes the sensor can be flaky at
> only higher temps, so this method really only works to tell you if you have
> an absolutely dead sensor.
> >
> > HTH
> >
> >
> > Ingo Rautenberg
> >
> > -----Original Message-----
> > From: Mike Del Tergo <mdeltergo at hotmail.com>
> >
> > Date: Sat, 29 Aug 2009 21:49:22
> > To: <urq at audifans.com>
> > Subject: [urq] reference sensor bench testing
> >
> >
> >
> > Has anyone run across a way to bench test the flywheel reference sensors
> Audi uses? One in my UrQ tests bad through the harness but of course it is
> not unheard of to lose the reference pin so I wanted to bench test before
> ponying up for OEM.
> > Mike
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