Yamaha YZF-R1 Series Service Manual page 764

EAS20686
12_ABS
EAS33315
TROUBLESHOOTING
Item
Rear wheel sensor (intermittent pulses or no pulses)
Procedure
1. Foreign material adhered around the rear 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 rear wheel
• Check the components for looseness, distortion, and bends.
Refer to "CHECKING THE REAR WHEEL" on page 4-47.
Is check result OK?
YES
→ Go to step 3.
NO
→ Replace the wheel axle, tire, rear 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 REAR WHEEL SENSOR AND SENSOR ROTOR" on page
4-49.
Is check result OK?
YES
→ Go to step 4.
NO
→ Replace the sensor rotor.
4. Defective rear 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 REAR WHEEL SENSOR AND SENSOR ROTOR" on page
4-49.
Is check result OK?
YES
→ Replace the hydraulic unit assembly (ABS ECU).
NO
→ Repair or replace the wheel sensor.
9-267
12_ABS