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Old 01-18-2013, 02:04 AM   #23
a4x4iwi
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Join Date: Jan 2013
Location: Sydney
Posts: 1
My Ride: E30
It looks like they use Hall sensors, not potentiometers.

These are a non contact mechanism using a magnet and a sensor that detect magnetic field. They offer high reliability.

See http://www.ge39.com/files/m54x5.pdf

Testing would need to be with the ignition in the run position using a volt meter.

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