R 350 4MATIC (251.165) V6-3.5L (272.967) (2006)
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Wheel Speed Sensor: Description and Operation
GF42.45-P-5134RT Wheel rpm sensor, component description
Component Identification
Task
The rpm sensors supply the current wheel speeds to the ESP control unit (N47-5). The ESP evaluates these signals corresponding to the direction of
rotation, the wheel speed and fault detection.
Design
The rpm sensors are active sensors, consisting of a housing and a sensor element which is based on the magneto-resistive measuring principle.
The diagram shows the current curve through an active rpm sensor during an acceleration phase.
Function of the active wheel speed sensor
The strength and direction of an external magnetic field causes a change in the internal resistance inside the sensor. Via an electronic analysis system
