Originally Posted by oldskewel

Bnen911, I'm glad my quick comment was able to help you out. Your careful description matched my previous experience fairly exactly, which helped.

Dubbin, It sounds like you've got a different problem. I would not assume that you've got nothing to lose by repairing the AFM, even if that is not the source of your problems. At the least, I would do the tests on it before opening it up. I checked my saved links from this, and here are the ones that still work. I did this fix in the days before youtube, so none are from there.

https://rennlist.com/forums/911-foru...-on-3-2-a.html

http://www.the944.com/afm.htm
I think the 944 versions are basically the same (size, design form), but the numbers (angles, resistance, voltage values) will be different, so keep that in mind when following instructions for 944 vs 911.

http://www.systemsc.com/tests.htm
Towards the bottom of the page, he shows values for voltage output vs. angle

https://rennlist.com/forums/911-foru...idle-only.html
Real AFM stuff starts on page 2, so read on.

https://rennlist.com/forums/911-foru...tment-etc.html

Here's my summary on how to test it, after digesting all the info:
remove AFM, connect 9V battery where 5V should be.
Door closed ==> 0.45V
Wide open ==> 8.0V (assuming 9V battery, adjust accordingly)
linear in between
Measuring resistance only, it will be smooth but not monotonic - low-high-low

I've got more complete notes and a copy of someone's Dissertation on the topic that is no longer on the interwebs too, in case there is interest.