Engine Speed Sender - Volkswagen Marine TDI 100-5 User Manual

Engine electronic systems

Engine speed sender

The engine speed sender is located in the vicinity
of the starter crown gear. It scans five marks on
the sender wheel for engine speed.
The engine control unit uses the signal to detect
the engine speed.
Functional description
The sender operates in accordance with the
induction principle.
The marks on the sender wheel generate an
alternating voltage in the sender coil. From this
MSSP_001_022
signal, the engine control unit can accurately
calculate the angular position and the current
engine speed.
Substitute function
If the engine control unit receives no signal from
the engine speed sender, an activated
emergency operation program uses the signal
from the needle lift sender as a substitute signal.
Effect
The injection volume is reduced thus also
reducing the engine power output. The engine is
shut down if the signal from the needle lift sender
also fails.
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