Yamaha YZF-R1 2020 Service Manual page 778

EAS20685
11_ABS
EAS33314
TROUBLESHOOTING
Item
Front wheel sensor (intermittent pulses or no pulses)
Procedure
TIP
If the rear wheel continues to turn for more than 20 seconds after the front wheel has stopped, this will
be recorded.
1. Foreign material adhered around the front wheel sensor
• Check the surface of the sensor rotor and wheel sensor for foreign material, such as metal particles.
Is check result OK?
YES
→ Go to step 2.
NO
→ Clean the sensor rotor and wheel sensor.
2. Incorrect installation of the front wheel
• Check the components for looseness, distortion, and bends.
Refer to "CHECKING THE FRONT WHEEL" on page 4-38.
Is check result OK?
YES
→ Go to step 3.
NO
→ Replace the wheel axle, tire, front wheel, wheel bearings or oil seals.
3. Defective sensor rotor or incorrect installation of the rotor
• Check the surface of the sensor rotor for damage.
Refer to "MAINTENANCE OF THE FRONT WHEEL SENSOR AND SENSOR ROTOR" on page
4-40.
Is check result OK?
YES
→ Go to step 4.
NO
→ Replace the sensor rotor.
4. Defective front wheel sensor or incorrect installation of the sensor
• Check the wheel sensor for damage and the installed condition of the sensor.
Refer to "MAINTENANCE OF THE FRONT WHEEL SENSOR AND SENSOR ROTOR" on page
4-40.
Is check result OK?
YES
→ Replace the hydraulic unit assembly (ABS ECU).
NO
→ Repair or replace the wheel sensor.
9-283
11_ABS