ANTILOCK BRAKE SYSTEM
04–13–10
ABS WHEEL-SPEED SENSOR FUNCTION
CHU041343720S01
• The ABS wheel-speed sensor, which has a magnetic pick-up, transmits the rotation condition of each wheel to
the ABS HU/CM.
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ABS WHEEL-SPEED SENSOR CONSTRUCTION/OPERATION
CHU041343720S02
Structure
• The front ABS wheel-speed sensor and the front
ABS sensor rotor are integrated with the front
wheel hub and installed on the steering knuckle.
Therefore, if there is any malfunction of the front
ABS wheel-speed sensor, replace the front wheel
hub component.
• The rear ABS wheel-speed sensor is installed on
the rear knuckle and the rear ABS sensor rotor is
integrated with the drive shaft. Therefore, if there
is any malfunction of the rear ABS sensor rotor,
replace the drive shaft.
Operation
• As the ABS sensor rotor rotates, magnetic flux
formed from the permanent magnet varies and
alternating current is formed with an
electromagnetic conductor. Using this alternating
current, rotation speed is expressed as a varying
proportional cycle and from detection of this cycle
the CM part of the ABS HU/CM can then detect
the wheel rotation speed. While the structures of
the front and rear ABS wheel-speed sensor differ,
the operation is the same.
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FRONT ABS SENSOR ROTOR
COIL
MAGNET
CHU0413S002
REAR ABS SENSOR ROTOR
MAGNET
COIL
CHU0413S003
+
-
V
OUTPUT VOLTAGE WAVEFORM
AT LOW SPEED
AT HIGH SPEED
CHU0413S004
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