9-3 Arc/Aero (9440) L4-2.0L Turbo (2.0 T) (2004)
/l4-2.0l_turbo_(2.0_t)/Page-2315001.png)
Wheel Speed Sensor: Description and Operation
Rear (298RL, RR) Wheel Speed Sensor
Wheel Speed Sensor, Rear (298RL, RR)
Main use
To send wheel speed to the TC/ABS 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 (not for control module)
