Vehicles after change point in 1982
Measure resistance* of sensor coil (M 06) on + and - of plug.


* See Specifications

Connect oscilloscope (M 22/23) on + and - connections of speed sensor.
Turn engine with the starter.
Signal shown in the figure should be displayed.
Only the shape is important when evaluating the signal - not the amplitude height.

Check reference mark sensor in same manner.
If oscillograph deviates, remove sensor and check for dirt (grease, burrs, dust), cleaning if
necessary.
Check reference mark, replacing pin for flywheel if necessary.