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That would be the later style sensor....the info I posted was for HFM 2 wire sensor, so that would be invalid info for the 3 wire. The 2 wire is a VR [ variable reluctor ] Sensor . The 3 wire requires V input from the ECU and switches that signal on/off.
I do not know when they made that change, as my CD is from '95/104 systems. Prob when they went from HFM to Motronic/OBD2. [ '96]
As OKC 's post shows, this 3 wire is a switching sensor, where the 2 wire is a sine wave sensor [ like an ABS wheel sensor type];
The newer sensor is much better b/c it actually switches the signal, thereby giving you a square wave , On/Off signal. Whereas the 2 wire is a signal generator and you wind up with a variable voltage a/c sine wave...no where as acurate as the square wave format. I would make sure the end of the sensor is clean of debries.
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A Dalton
Last edited by Arthur Dalton; 02-09-2009 at 12:46 AM.
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