Hall Effect Sensor

Derek Pulvino dbpulvino at hotmail.com
Sat Jan 25 17:58:31 EST 2003

Linus and company,

Don't know what you eventually decided to do w/your distributor but just
wanted to report back on some more data mining I recently did.  The resulta
are basically I am pretty much 100%certain you could use a Hall Effect
Sensor from any of the t44 vehicles w/out problem.

Here's why I say this: looking through the Bentley, for the 100/200 and 5k,
the input voltage (9v), and output voltage when both the hall effect sensor
shutter window is open (0-0.5v), and closed (>4v) is the same for every
engine type listed in the Bentleys.  This includes both MC's (1 and 2 knock
sensor), the NF (listed as CIS-III), the 84-88 turbo, and CIS-E for 84-88
5k's. (I may have some redundancy here, but I think you get my point.)

Additionally, (while this may just be used for ease of publication), all of
the pictures of the distributors hall effect sensor windows are the same for
each engine type.

Oh, and Chris Miller, found a mistake in the Bentley on Page 28.29.  The
picture of a the shutter window does not jibe with the description in the

Anyhoo, serve warm and enjoy.

Derek P



As I haven't heard back from you, I'm going to go ahead and put my 16v
distributor back together.  I also asked Bernie what he thought about
interchangability of Hall Senders.  He was of the opinion that they all
should be interchangable from a functional standpoint.

I imagine the signal is likely similar between one and the other, and the
difference between MC and 3B engines lies only in the shutter window with
the Motronic control unit calibrated to interpret the signal accordingly. I
can picture this being pretty easy to check.

Also, in lurking in the VWVortex, people are attributing failures of the
Hall Sender in the oil leak prone 16v distributors to damage to the wires
coming out of the Hall Sender, and guessing the hot oil is corrupting the
insulation (I guess this then raises the question how that would then effect
the actual copper wiring? if extreme enough, shorting?).  At any rate, I
imagine this finding can be cross generalized; ie hall sender problems in
the 200 distributor is from wiring damage, not damage to the hall sender
itself.  And as I'd stated before, people have been able to succesfully
interchange hall senders from the 8v and 16v engines with no problems

I assume you could use a hall sender from a used 10v engine without issue,
but no proof.  Worth finding a used one in the junkyard to investigat?
Depends how much time you have.  I think so.

Best of luck.

Derek Pulvino


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