Yamaha YZF-R1 2020 Service Manual page 558

SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE
DTC
42 Rear wheel ABS (intermit-
tent wheel speed pulses or
incorrect depressurization)
43* Front wheel sensor (missing
45* pulses)
44* Rear wheel sensor (missing
46* pulses)
51 Vehicle system power supply
(voltage of ABS ECU power
supply is high)
53 Vehicle system power supply
(voltage of ABS ECU power
supply is low)
55 Hydraulic unit assembly (de-
fective ABS ECU)
56 Hydraulic unit assembly (ab-
normal internal circuit)
Item
• Pulses from the rear wheel
sensor are received inter-
mittently while the vehicle
is traveling.
• Rear wheel will not recover
from the locking tendency
even though the signal is
transmitted from the ABS
ECU to reduce the hydrau-
lic pressure.
Front wheel sensor signal is
not received properly. (Miss-
ing pulses are detected in
the signal while the vehicle is
traveling.)
Rear wheel sensor signal is
not received properly. (Miss-
ing pulses are detected in
the signal while the vehicle is
traveling.)
Power voltage supplied to
the ABS ECU in the hydrau-
lic unit assembly is too high.
Power voltage supplied to
the ABS ECU in the hydrau-
lic unit assembly is too low.
Abnormal data is detected in
the hydraulic unit assembly.
Abnormality detected in of
hydraulic unit assembly.
9-63
Symptom
• Incorrect installation of the
• Incorrect rotation of the
• Rear brake dragging
• Defective hydraulic unit as-
• Foreign material adhered
• Incorrect installation of the
• Defective sensor rotor or
• Defective front wheel sen-
• Foreign material adhered
• Incorrect installation of the
• Defective sensor rotor or
• Defective rear wheel sen-
• Defective battery
• Disconnected battery ter-
• Defective charging system
• Defective battery
• Defective coupler between
• Open or short circuit in the
• Defective charging system
• Defective hydraulic unit as-
• Defective hydraulic unit as-
Check point
rear wheel sensor
rear wheel
sembly
around the front wheel sen-
sor
front wheel
incorrect installation of the
rotor
sor or incorrect installation
of the sensor
around the rear wheel sen-
sor
rear wheel
incorrect installation of the
rotor
sor or incorrect installation
of the sensor
minal
the battery and the hydrau-
lic unit assembly
wire harness between the
battery and the hydraulic
unit assembly
sembly
sembly