SPECIFICATIONS. Each WSS is serviced individu-
ally. The tone wheels are serviced as an assembly
with the hub and bearing assemblies.
OPERATION
The CAB sends 12 volts to power an Integrated
Circuit (IC) in the sensor. The IC supplies a constant
7 mA power supply to the CAB. The relationship of
the tooth on the tone wheel to the permanent magnet
in the sensor, signals the IC to enable a second 7 mA
power supply. The output of the sensor, sent to the
CAB, is a DC voltage signal with changing voltage
and current levels. The ground for the IC and the
current sense circuit is provided by the CAB.
When a valley of the tone wheel is aligned with the
sensor, the voltage signal is approximately 0.8 volts
and a constant 7 mA current is sent to the CAB. As
the tone wheel rotates, the tooth shifts the magnetic
field and the IC enables a second 7 mA current
source. The CAB senses a voltage signal of approxi-
mately 1.6 volts and 14 mA. The CAB measures the
amperage of the digital signal for each wheel. The
resulting signal is interpreted by the ABS CAB as
the wheel speed.
TONE WHEEL
DESCRIPTION
The tone wheel is used in conjunction with the
wheel speed sensors. (Refer to 5 - BRAKES - ABS/
ELECTRICAL/FRONT WHEEL SPEED SENSOR -
DESCRIPTION) or (Refer to 5 - BRAKES - ABS/
ELECTRICAL/REAR WHEEL SPEED SENSOR -
DESCRIPTION)
OPERATION
The tone wheel is used in conjunction with the
wheel speed sensors. (Refer to 5 - BRAKES - ABS/
ELECTRICAL/FRONT WHEEL SPEED SENSOR -
OPERATION) or (Refer to 5 - BRAKES - ABS/ELEC-
TRICAL/REAR WHEEL SPEED SENSOR -
OPERATION)
Fig. 4 Left Rear Wheel Speed Sensor
1 - LEFT REAR WHEEL SPEED SENSOR
2 - TENSION STRUT
Fig. 5 Right Rear Wheel Speed Sensor
1 - RIGHT REAR WHEEL SPEED SENSOR
2 - TENSION STRUT
PL BRAKES-ABS 5s - 31
REAR WHEEL SPEED SENSOR (Continued)
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