Yamaha R1 Series 2015 Service Manual page 624

Fault code No. 34
Fault code No.
Item
Symptom
Order Item/components and probable cause
1 Defective hydraulic unit assembly
Fault code No. 41
Fault code No.
Item
Symptom
Order Item/components and probable cause
1 Incorrect installation of the front wheel
sensor
2 Incorrect rotation of the front wheel
3 Front brake dragging
4 Defective hydraulic unit assembly
34
Hydraulic unit assembly (short circuit in ABS motor power supply
circuit)
Short circuit is detected in the motor power supply circuit in the
hydraulic unit assembly.
Check or maintenance job
Replace the hydraulic unit assembly.
Refer to "ABS (Anti-lock Brake System)" on page 4-65.
41
Front wheel ABS (intermittent wheel speed pulses or incorrect
depressurization)
• Pulses from the front wheel sensor are received intermittently
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
hydraulic pressure.
Check or maintenance job
Check the components for looseness, distortion, and
bends.
Refer to "CHECKING THE FRONT WHEEL" on page
4-27.
Check that there is no brake disc drag on the front wheel
and make sure that it rotates smoothly.
Refer to "CHECKING THE FRONT WHEEL" on page
4-27 and "CHECKING THE FRONT BRAKE DISCS" on
page 4-48.
Check that the brake fluid pressure is correctly transmit-
ted to the brake caliper when the brake lever is operated
and that the pressure decreases when the lever is
released.
Refer to "CHECKING THE FRONT BRAKE DISCS" on
page 4-48.
If the above items were performed and no malfunctions
were found, replace the hydraulic unit assembly.
Refer to "ABS (Anti-lock Brake System)" on page 4-65.
8-143
ABS (Anti-lock Brake System)