Yamaha YZF-R1 Series Service Manual page 550

SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE
DTC
15 Front wheel sensor (open or
short circuit)
16 Rear wheel sensor (open or
short circuit)
21 Hydraulic unit assembly (de-
fective solenoid drive circuit)
31 Hydraulic unit assembly (de-
fective ABS solenoid power
circuit)
33 Hydraulic unit assembly (ab-
normal ABS motor power
supply)
34 Hydraulic unit assembly
(short circuit in ABS motor
power supply circuit)
41 Front wheel ABS (intermit-
tent wheel speed pulses or
incorrect depressurization)
Item
Open or short circuit is de-
tected in the front wheel sen-
sor.
Open or short circuit is de-
tected in the rear wheel sen-
sor.
Solenoid drive circuit in the
hydraulic unit assembly is
open or short-circuited.
Power is not supplied to the
solenoid circuit in the hy-
draulic unit assembly.
Power is not supplied to the
motor circuit in the hydraulic
unit assembly.
Short circuit is detected in
the motor power supply cir-
cuit in the hydraulic unit as-
sembly.
• Pulses from the front wheel
sensor are received inter-
mittently while the vehicle
is traveling.
• Front wheel will not recover
from the locking tendency
even though the signal is
transmitted from the ABS
ECU to reduce the hydrau-
lic pressure.
9-53
Symptom
• Defective coupler between
the front wheel sensor and
the hydraulic unit assembly
• Open or short circuit in the
wire harness between the
front wheel sensor and the
hydraulic unit assembly
• Defective front wheel sen-
sor or hydraulic unit as-
sembly
• Defective coupler between
the rear wheel sensor and
the hydraulic unit assembly
• Open or short circuit in the
wire harness between the
rear wheel sensor and the
hydraulic unit assembly
• Defective rear wheel sen-
sor or hydraulic unit as-
sembly
• Defective hydraulic unit as-
sembly
• Blown ABS solenoid fuse
• Defective coupler between
the battery and the hydrau-
lic unit assembly
• Open or short circuit in the
wire harness between the
battery and the hydraulic
unit assembly
• Defective hydraulic unit as-
sembly
• Blown ABS motor fuse
• Defective coupler between
the battery and the hydrau-
lic unit assembly
• Open or short circuit in the
wire harness between the
battery and the hydraulic
unit assembly
• Defective hydraulic unit as-
sembly
• Defective hydraulic unit as-
sembly
• Incorrect installation of the
front wheel sensor
• Incorrect rotation of the
front wheel
• Front brake dragging
• Defective hydraulic unit as-
sembly
Check point