[V8] Hall Sensor [was cam speed sensor]

Buchholz, Steven Steven.Buchholz at kla-tencor.com
Tue Dec 2 12:32:26 EST 2003

... good job of detailing the diagnostic process!  The fact of the matter is
that Hall Senders do fail.  I had the Hall Sender code on #344 until I
swapped the right distributor from #2's dead engine.  I've heard others who
have had similar Hall Sender failures on V8s and other Audis (most I-5T's
have a Hall Sender in the distributor).  I never really noticed any change
in the operation of the V8 after the dizzy swap ... just got rid of the

Steve B.
San Jose, Kaleefohnia (USA)
> The sensor is not replaceable unless you have some fancy 
> machine shop tools to 
> take it apart and press it back together. (and the replacement part)
> The part is easily testable with a volt meter. I would remove 
> the distributor 
> both for a good inspection and to make testing easier.
> There is a section in the manual that describes in detail how 
> to check it out 
> but basically you have 5 volts supply to the unit (I think 
> the two outer wires) 
> and the center wire is signal. First verify supply voltage, 
> then measure the 
> signal wire while rotating the distributor shaft. It should 
> switch from 5 volts 
> to zero as you rotate the shaft. These sort of sensors are 
> usually pretty 
> robust. I would look hard at the wires and connectors for 
> your problem.

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