Fault Code No. 21; Fault Code No. 24 - Yamaha TMAX XP530E-A 2017 Service Manual

Fault code No.
Item
Symptom
Order Item/components and probable cause
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. 21

Fault code No.
Item
Symptom
Order Item/components and probable cause
1 Defective hydraulic unit assembly

Fault code No. 24

Fault code No.
Item
Symptom
Order Item/components and probable cause
1 Defective signaling system (tail/brake light
or brake light switch)
2 Defective coupler between the signaling
system (tail/brake light or brake light
switch) and the hydraulic unit assembly
3 Open or short circuit in the wire harness
between the signaling system (tail/brake
light or brake light switch) and the hydrau-
lic unit assembly
4 Defective hydraulic unit assembly
18
46
Rear wheel sensor (missing pulses)
Rear wheel sensor signal is not received properly. (Missing pulses
are detected in the signal while the vehicle is traveling.)
Check or maintenance job
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 4-36.
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 4-36.
21
Hydraulic unit assembly (defective solenoid drive circuit)
Solenoid drive circuit in the hydraulic unit assembly is open or short-
circuited.
Check or maintenance job
Replace the hydraulic unit assembly.
Refer to "ABS (Anti-lock Brake System)" on page 4-71.
24
Brake light switch or tail/brake light
Brake light signal is not received properly while the vehicle is travel-
ing. (Brake light circuit, or front or rear brake light switch circuit.)
Check or maintenance job
Check the brake light switches.
Refer to "CHECKING THE SWITCHES" on page 8-221.
• Check the coupler for any pins that may be pulled out.
• Check the locking condition of the coupler.
• If there is a malfunction, repair it and connect the cou-
pler securely.
• Between ABS ECU coupler and joint coupler.
(Green–Yellow)
• Between joint coupler and front brake light switch cou-
pler.
(Green–Yellow)
• Between joint coupler and rear brake light switch cou-
pler.
(Green–Yellow)
If the above items were performed and no malfunctions
were found, replace the hydraulic unit assembly.
Refer to "ABS (Anti-lock Brake System)" on page 4-71.
8-182
ABS (Anti-lock Brake System)