Yamaha MTN850-A 2017 Service Manual page 490

Fault code No. 12
Fault code No.
Item
Symptom
Order Item/components and probable cause
1 Foreign material adhered around the rear
wheel sensor
2 Incorrect installation of the rear wheel
3 Defective sensor rotor or incorrect instal-
lation of the rotor
4 Defective rear wheel sensor or incorrect
installation of the sensor
Fault code No. 13, 26
Fault code No.
Item
Symptom
Order Item/components and probable cause
1 Foreign material adhered around the front
wheel sensor
2 Incorrect installation of the front wheel
3 Defective sensor rotor or incorrect instal-
lation of the rotor
4 Defective front wheel sensor or incorrect
installation of the sensor
TIP
• If the front brake ABS operates continuously for 20 seconds or more, fault code No. 26 will be record-
ed. If the front brake ABS operates continuously for 36 seconds or more, fault code No. 13 will be re-
corded.
ABS (ANTI-LOCK BRAKE SYSTEM)
12
Rear wheel sensor (intermittent pulses or no pulses)
Rear wheel sensor signal is not received properly. (Pulses are not
received or are received intermittently while the vehicle is travel-
ing.)
Check or maintenance job
Check the surface of the sensor rotor and wheel sensor
for foreign material, such as metal particles.
Clean the sensor rotor and wheel sensor if necessary.
Check the components for looseness, distortion, and
bends.
Refer to "CHECKING THE REAR WHEEL" on page
4-21.
Check the surface of the sensor rotor for damage.
Replace the sensor rotor if there is visible damage.
Refer to "MAINTENANCE OF THE REAR WHEEL
SENSOR AND SENSOR ROTOR" on page 4-22.
Check the wheel sensor for damage and the installed
condition of the sensor. Repair or replace the wheel
sensor if necessary.
Refer to "MAINTENANCE OF THE REAR WHEEL
SENSOR AND SENSOR ROTOR" on page 4-22.
13
26
Front wheel sensor (abnormal pulse period)
Front wheel sensor signal is not received properly. (The pulse
period is abnormal while the vehicle is traveling.)
Check or maintenance job
Check the surface of the sensor rotor and wheel sensor
for foreign material, such as metal particles.
Clean the sensor rotor and wheel sensor if necessary.
Check the components for looseness, distortion, and
bends.
Refer to "CHECKING THE FRONT WHEEL" on page
4-10.
Check the surface of the sensor rotor for damage.
Replace the sensor rotor if there is visible damage.
Refer to "MAINTENANCE OF THE FRONT WHEEL
SENSOR AND SENSOR ROTOR" on page 4-12.
Check the wheel sensor for damage and the installed
condition of the sensor. Repair or replace the wheel
sensor if necessary.
Refer to "MAINTENANCE OF THE FRONT WHEEL
SENSOR AND SENSOR ROTOR" on page 4-12.
8-133