also im Bentley Rep.-buch steht folgendes:
Crankshaft position/rpm sensor
crankshaft position is determined by missing-teeth gap on pulse wheel.
Coil resistance (approx.) @ 20 Grad C.
M30/M70 engine 540 plus/minus 10% Ohm
Air gap (sensor distance from toothed wheel) 1.0 plus/minus 0,3 mm
Note: if the sensor resistance iis correct, it does not mean that the DME is receiving the signal from the pulse sensor. Make a dynamic test using a scope or digital voltmeter (VAC) at terminals 15 and 1 while cranking the engine. An AC voltage indicates that the sensor is functioning.
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