S 550 (221.171) V8-5.5L (273.961) (2007)
Wheel Speed Sensor: Description and Operation
GF42.45-P-5134SX Wheel rpm sensor, component description
Component Identification
Location
The left and right front rpm sensor are located in the steering knuckle of the front axle.
The left and right rear rpm sensor are located in the wheel carrier of the rear axle.
Task
The rpm sensors supply the current wheel speeds as a square wave signal to the ESP control unit (N47-5). The ESP control unit evaluates these signals
with regard to direction of rotation, wheel speed and fault detection.
The display shows the current curve through the active rpm sensor during an acceleration phase.
Function