Fwd: No Start '94 100S...the story continues with a possible clue??!!

[Cwalln at aol.com]

The quest to find the culprit in my non-starting 100S continues, but now 
there is a possible clue...testing the ECU inputs turned up no voltage 
fluctuation from the brand new camshaft Hall effect switch.  Is this normal?! 

The following email is from my shop.  Any additional thoughts..are we on the 
verge of identifying the culprit?

Chris W.

FYI  My original email to quatro at audifans.com is attached at the bottom.  I 
received numerous and excellent suggestions from my original question.

<< Subj:     Re: Fwd: No Start '94 100S...the common suspects have been    
eliminated...ideas??
 Date:  9/2/2000 4:54:07 PM Pacific Daylight Time
 From:  mark at britisheuropean.com (Mark S. Singleton)
 To:    Cwalln at aol.com
 
 We have checked at the e.cu all imputs, we have all except the Hall effect 
switch from
 the camshaft!! At the cam even the new hall switch is not giving a signal? 
We have
 probed every which way and cannot get a pattern with the lab scope even at 
the switch
 itself. The voltage is there but no fluctuation signal.  We are going to 
recheck with
 the other audi owner if we can snag the car again on Monday and check that 
one for
 signal.  The can is turning and doing what it should, but why no signal 
remains a
 mystery. Will keep you informed mon-tuesday
 


Subj:   No Start '94 100S...the common suspects have been eliminated...ideas??
Date:   8/29/2000 12:31:16 PM Pacific Daylight Time
From:   Cwalln
To: quattro at audifans.com
CC: awallner at clrg.com, mark at britisheuropean.com

My '94 100S has been perfectly reliable for the 5 years I have owned it.  Two 
weeks ago, it would not start...no problem turning over...a computer 
somewhere appears to be not giving the ok to start...towed the car to a shop 
great in diagnostics.

No error codes.  The shop has been going through and swapping out computer 
parts from a same vintage, but running Audi, in an attempt to identify the 
problem.  The common suspects, the crankshaft position sensor and the 
ignition control module appear to be working properly.

Before the shop goes the next step and pulls the main and very expensive ECU 
deeply buried behind the glove box...has anyone out there seen this kind of 
problem, or have some ideas on how to find the culprit?

Even the Audi technician at the local dealer is stumped.

Chris W.
 

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Subject: Re: Fwd: No Start '94 100S...the common suspects have been   
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