500SL (129.067) V8-5.0L (119.972) (1993)
Crankshaft Position Sensor: Description and Operation
Crankshaft Position Sensor Location
PURPOSE AND LOCATION
The crankshaft position sensor (L5) registers the crankshaft position and engine speed. The position sensor is mounted to the crankcase near the
starter flange. The sensor body projects through the crankcase very near to the segments on the flywheel/drive plate. There is no contact between
the segments or the position sensor.
Segment Wheel With Magnets
OPERATION
With the engine running, the four segments which are positioned 90° apart pass by the position sensor. Due to induction, an alternating voltage is
generated in the position sensor. The peak voltage is approx. 1.5 volts at starting speed. The voltage rises with increasing speed to approx. 3 volts
at 1200 rpm.
Fig. 25 Crankshaft Position Sensor Signal
t1 = First Segment