Sequoia LTD 4WD V8-4.7L (2UZ-FE) (2001)
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Wheel Speed Sensor: Description and Operation
ABS With EBD, BA, TRAC & VSC Systems
The speed sensor detects wheel speed and sends the appropriate signals to the ECU. These signals are used to control the ABS system. Each of the front
and rear rotors has 48 serrations.
When the rotors rotate, a magnetic field emitted by a permanent magnet in the speed sensor generates an AC voltage. Since the frequency of this AC
voltage changes in direct proportion to the speed of the rotor, the frequency is used by the ECU to detect the speed of each wheel.
