Yamaha TMAX 2020 Service Manual page 645

EAS20687
13, 26_ABS
EAS33316
TROUBLESHOOTING
Item
Front wheel sensor (abnormal pulse period)
Procedure
TIP
• If the front brake ABS operates continuously for 20 seconds or more, DTC No. 26 will be recorded.
If the front brake ABS operates continuously for 36 seconds or more, DTC No. 13 will be recorded.
• Vehicle possibly ridden on uneven roads.
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 4-24.
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-
26.
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-
26.
Is check result OK?
YES
 Replace the hydraulic unit assembly (ABS ECU).
NO
 Repair or replace the wheel sensor.
9-171
13, 26_ABS