Crankshaft Sensor (R50)

Crankshaft Sensor (R50)

Function
The signal from the crankshaft sensor is required by the engine control module to establish the rotation speed and position of the crankshaft. The Hall sensor determines a digital signal from a sensor wheel. This sensor wheel is located on the crankshaft and it has a gap in its tooth profile. The teeth are arranged at gaps of 6 degrees around the sensor wheel. The sensor generates an electrical signal when the engine turns. This signal is routed to the engine control module.

The gap is important for correct engine operation, as it is used for the synchronization of the engine control module with the motor. For the synchronization, the position of the gap on the sensor wheel must be stored in the engine control module. The synchronization is required to establish the crankshaft position and the engine speed. This information is mainly required to calculate the firing point and the fuel delivery volume. The synchronization takes place during the starting process.

Failure
If the synchronization is not successfully concluded, the flow of fuel is interrupted.