Yamaha 2003 FJR1300, Service Manual

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CHAS
EAS00878
ABS component functions
• Wheel sensors and sensor rotors
Wheel sensors
1
detect the wheel rotation
speed and transmit the wheel rotation signal to
the ECU (ABS).
Each wheel sensor is composed of a perma-
nent magnet and a coil. The wheel sensors are
installed in the sensor housing for each wheel.
Sensor rotors
2
are pressed in the inner side
of the front and rear wheel hubs and rotate
with the wheels. The sensor rotors have 42
serrations inside and are installed close to the
wheel sensors. As the distance changes
between the top and bottom of the serrations
with the rotation of the wheels, inductive elec-
tromotive force is generated in the wheel sen-
sors. Wheel rotation speed is detected based
on the frequency of this alternating voltage.
3
At high speed
4
At low speed
5
Wheel sensor
6
Sensor rotor
1
2
2
1
• ABS warning light
The ABS warning light comes on to warn the
rider if a malfunction in the ABS occurs.
When the main switch is set to “ON”, the ABS
warning light comes on for 2 seconds to check
if the ABS warning light is disconnected and to
check if the ABS is operating properly, then
goes off.
CAUTION:
If the rear wheel is raced with the motorcy-
cle on the centerstand, the ABS warning
light may flash or come on. If this occurs,
set the main switch to “OFF,” then back to
“ON”. The ABS operation is normal if the
ABS warning light comes on for 2 seconds,
then goes off.
1
ABS warning light
ANTI-LOCK BRAKE SYSTEM (FJR1300A)