Yamaha R15 2022 Service Manual page 447

Fault code
Item
No.
17* Front wheel sensor
45* (missing pulses)
18* Rear wheel sensor
46* (missing pulses)
21 Hydraulic unit as-
sembly (defective
solenoid drive cir-
cuit)
ABS (ANTI-LOCK BRAKE SYSTEM)
Symptom
Front wheel sensor
signal is not re-
ceived properly.
(Missing pulses are
detected in the sig-
nal while the vehicle
is traveling.)
Rear wheel sensor
signal is not re-
ceived properly.
(Missing pulses are
detected in the sig-
nal while the vehicle
is traveling.)
Solenoid drive cir-
cuit in the hydraulic
unit assembly is
open or short-circuit-
ed.
Check point
• Foreign material
adhered around
the front wheel
sensor
• Incorrect installa-
tion of the front
wheel
• Defective sensor
rotor or incorrect
installation of the
rotor
• Defective front
wheel sensor or in-
correct installation
of the sensor
• Foreign material
adhered around
the rear wheel
sensor
• Incorrect installa-
tion of the rear
wheel
• Defective sensor
rotor or incorrect
installation of the
rotor
• Defective rear
wheel sensor or in-
correct installation
of the sensor
• Defective hydrau-
lic unit assembly
8-114
ELEC –
Fail-safe system
Diag-
Start- Driving
nostic
ing the the ve-
code
engine hicle
Able Able —
Able Able —
Able Able —
+