Yamaha R15 2022 Service Manual page 449

Fault code
Item
No.
33 Hydraulic unit as-
sembly (abnormal
ABS motor power
supply)
34 Hydraulic unit as-
sembly (short circuit
in ABS motor power
supply circuit)
41 Front wheel ABS
(intermittent wheel
speed pulses or in-
correct depressur-
ization)
42 Rear wheel ABS (in-
47 termittent wheel
speed pulses or in-
correct depressur-
ization)
ABS (ANTI-LOCK BRAKE SYSTEM)
Symptom
Power is not sup-
plied to the motor
circuit in the hydrau-
lic unit assembly.
Short circuit is de-
tected in the motor
power supply circuit
in the hydraulic unit
assembly.
• Pulses from the
front wheel sensor
are received inter-
mittently while the
vehicle is traveling.
• Front wheel will
not recover from
the locking tenden-
cy even though the
signal is transmit-
ted from the ABS
ECU to reduce the
hydraulic pres-
sure.
• Pulses from the
rear wheel sensor
are received inter-
mittently while the
vehicle is traveling.
(for fault code No.
42)
• Rear wheel will not
recover from the
locking tendency
even though the
signal is transmit-
ted from the ABS
ECU to reduce the
hydraulic pres-
sure.
Check point
• Blown ABS motor
fuse
• Defective coupler
between the bat-
tery and the hy-
draulic unit
assembly
• Open or short cir-
cuit in the wire har-
ness between the
battery and the hy-
draulic unit assem-
bly
• Defective hydrau-
lic unit assembly
• Defective hydrau-
lic unit assembly
• Incorrect installa-
tion of the front
wheel sensor
• Incorrect rotation
of the front wheel
• Front brake drag-
ging
• Defective hydrau-
lic unit assembly
• Incorrect installa-
tion of the rear
wheel sensor (for
fault code No. 42)
• Incorrect rotation
of the rear wheel
• Rear brake drag-
ging
• Defective hydrau-
lic unit assembly
8-116
ELEC –
Fail-safe system
Diag-
Start- Driving
nostic
ing the the ve-
code
engine hicle
Able Able —
Able Able —
Able Able —
Able Able —
+