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Nothing. Goes to diagnostic connector only. (archive)
[ Follow Ups ] [ 5-series (E28) Message Board ] [ Msg. Board FAQ ]
Posted by RonW on September 16, 2001 at 20:14:33:

In Reply to: 86 535 What does the crank sensor in the front do? posted by Eddie on September 16, 2001 at 18:49:10:

That sensor goes to the diagnostic connector only. It's supposed to indicate TDC (top dead center). The signal itself is measured on pin 8 relative to pin 10, and the cable shield runs to pin 9. None of these signals go anywhere else- they are completely independent of everything else in the car. It might be useful to trigger a piece of diagnostic equipment if other signals are unreliable.

I have a 1986 535i I was wondering what does the crank sensor in the front of the engine do. What is it used for?

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