Motronic ME 7.1.1
Sensors
Engine Speed (RPM) Sensor G28
The Engine Speed Sensor is threaded either into the
side of the cylinder block or transmission housing. It
scans the sensor wheel on the crankshaft.
It can be an inductive sender, which senses the teeth
of the dual mass flywheel or the teeth of a toothed
wheel attached to the crankshaft.
It can be a Hall sensor, which senses the magnetic
stripes of a tone wheel that is attached to the
crankshaft.
Signal Utilization
The engine speed and the exact position of the
crankshaft relative to the camshaft are determined
by the engine speed sensor. The ECM uses this
information to to determine the injection point,
injection quantity and ignition timing and camshaft
timing control.
360_111
Effects of Signal Failure
In case of signal failure, either:
• The camshaft signal is used
• The engine is switched off and cannot be restarted
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