Yamaha MBK XMAX 2014, Service Manual

Page: 430 / 482

ABS (ANTI-LOCK BRAKE SYSTEM) (for YP125RA)
8-117
Fault code No. 34
Item
Hydraulic unit assembly (short circuit in ABS motor power
supply circuit)
Symptom
Short circuit is detected in the motor power supply circuit in
the hydraulic unit assembly.
Order
Item/components and probable
cause
Check or maintenance job
1 Defective hydraulic unit assembly Replace the hydraulic unit assembly.
Refer to “ABS (ANTI-LOCK BRAKE SYSTEM) (for
YP125RA)” on page 4-62.
Fault code No. 41
Item
Front wheel ABS (intermittent wheel speed pulses or incorrect
depressurization)
Symptom
• Pulses from the front wheel sensor are received intermittent-
ly 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.
Order
Item/components and probable
cause
Check or maintenance job
1 Incorrect installation of the front wheel
sensor Check the components for looseness, distortion,
and bends.
Refer to “CHECKING THE FRONT WHEEL” on
page 4-20.
2 Incorrect rotation of the front wheel 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 4-20 and “CHECKING THE FRONT BRAKE
DISC” on page 4-37.
3 Front brake dragging Check that the brake fluid pressure is correctly
transmitted to the brake caliper when the brake le-
ver is operated and that the pressure decreases
when the lever is released.
Refer to “CHECKING THE FRONT BRAKE DISC”
on page 4-37.
4 Defective hydraulic unit assembly If the above items were performed and no malfunc-
tions were found, replace the hydraulic unit assem-
bly.
Refer to “ABS (ANTI-LOCK BRAKE SYSTEM) (for
YP125RA)” on page 4-62.