Yamaha MT-09 2021 - 14, 27_Abs; Troubleshooting

9-278
14, 27_ABS
EAS20688
14, 27_ABS
EAS33317
TROUBLESHOOTING
Item
Rear wheel sensor (abnormal pulse period)
Procedure
TIP
• If the rear brake ABS operates continuously for 20 seconds or more, DTC No. 27 will be recorded. If
the rear brake ABS operates continuously for 36 seconds or more, DTC No. 14 will be recorded.
• Vehicle possibly ridden on uneven roads.
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.
2. Incorrect installation of the rear wheel
• Check the components for looseness, distortion, and bends.
Refer to “CHECKING THE REAR WHEEL” on page 4-21.
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-
22.
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-
22.
Is check result OK?
YES
→ Go to step 2.
NO
→ Clean the sensor rotor and wheel sensor.
Is check result OK?
YES
→ Go to step 3.
NO
→ Replace the wheel axle, tire, rear wheel, wheel bearings or oil seals.
Is check result OK?
YES
→ Go to step 4.
NO
→ Replace the sensor rotor.
Is check result OK?
YES
→ Replace the hydraulic unit assembly (ABS ECU).
NO
→ Repair or replace the wheel sensor.