Abs Component Functions - Yamaha FJR1300AS(X) Service Manual

ABS block diagram
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1. Rear brake master cylinder
2. Hydraulic unit assembly
3. Front brake master cylinder
4. Inlet solenoid valve
5. ABS motor
6. Hydraulic pump
7. Outlet solenoid valve
8. ABS ECU
9. Buffer chamber
ET3P61051

ABS COMPONENT FUNCTIONS

Wheel sensors and wheel sensor rotors
Wheel sensors "1" detect the wheel rotation speed and transmit the wheel rotation signal to the ABS
ECU.
Each wheel sensor contains a Hall IC. The wheel sensors are installed in the sensor housing for each
wheel.
Sensor rotors "2" are installed on the inner side of the front and rear wheel hubs and rotate with the
wheels.
The front and rear sensor rotors each have 84 magnetic poles (42 pairs) and are installed close to the
wheel sensors. As the sensor rotor rotates, the Hall element in the Hall IC installed in the wheel sensor
generates pulses. The pulse frequency, which is proportional to the magnetic flux density, is converted
into a wave in the Hall IC so that it can be output.
The ABS ECU calculates the wheel rotation speed by detecting the pulse frequency.
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10. Proportioning valve
11. Rear brake caliper
12. Rear wheel sensor
13. Metering valve
14. ABS warning light
15. Left front brake caliper
16. Front wheel sensor
17. Right front brake caliper
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FEATURES
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