9-3 Arc/Aero (9440) L4-2.0L Turbo (2.0 T) (2004)
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Wheel Speed Sensor: Description and Operation
Front (298FL, FR) Wheel Speed Sensor
Wheel Speed Sensor, Front (298FL, FR)
Main use
To send wheel speed to the TCS or ESP unit.
Type
Two Hall sensors which measure wheel speed using a 48-pole magnetic disc, which provides 48 pulses per rotation.
The Hall sensor sends a square pulse with a 50% pulse-rate.
The control module uses the frequency to calculate wheel speed; by measuring variation in current consumption, the frequency can be measured. The
frequency increases with a corresponding increased wheel speed from 0 to 2000 Hz.
Connection
