Yamaha MBK X-MAX 300 2017, Service Manual

Page: 408 / 462

ABS (ANTI-LOCK BRAKE SYSTEM)
8-103
Fault code No. 42, 47
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
4-29 and “CHECKING THE FRONT BRAKE DISC” on
page 4-44.
3 Front brake dragging 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 re-
leased.
Refer to “CHECKING THE FRONT BRAKE DISC” on
page 4-44.
4 Defective hydraulic unit assembly 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
4-63.
Fault code No. 41
Item
Front wheel ABS (intermittent wheel speed pulses or incorrect de-
pressurization)
Symptom
• 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.
Order Item/components and probable cause Check or maintenance job
Fault code No.
42
47
Item
Rear wheel ABS (intermittent wheel speed pulses or incorrect depres-
surization)
Symptom
• Pulses from the rear wheel sensor are received intermittently while
the vehicle is traveling. (for fault code No. 42)
• Rear 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 rear wheel
sensor (for fault code No. 42) Check the components for looseness, distortion, and
bends.
Refer to “CHECKING THE REAR WHEEL” on page
4-35.
2 Incorrect rotation of the rear wheel Check that there is no brake disc drag on the wheel and
make sure that it rotates smoothly.
Refer to “CHECKING THE REAR WHEEL” on page
4-35.
3 Rear brake dragging 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 re-
leased.
Refer to “CHECKING THE REAR BRAKE DISC” on
page 4-57.