Replace it if necessary.

Inner Tube Inspection
Spring Tension InspectionABS and KIBS Indicator Lights (LED) Inspection
In this model, the ABS indicator light (LED) [A] and KIBS
indicator light (LED) [B] go on or blink by the data sent
from the KIBS hydraulic unit.
Refer to the Meter Unit Inspection in the Electrical System
chapter.
ABS and KIBS Indicator Lights (LED) Function
*: The mode of “Low ...
KIBS System Circuit
1. Ignition Switch
2. Front Wheel Rotation Sensor
3. Front Brake Light Switch
4. Joint Connector C
5. Joint Connector D
6. ECU
7. Rear Wheel Rotation Sensor
8. Rear Brake Light Switch
9. Battery 12 V 8.6 Ah
10. Main Fuse 30 A
11. KIBS Motor Relay Fuse 30 A
12. KIBS Solenoid Valve Rela ...
Drive Chain Wear Inspection
Remove the chain cover (see Drive Chain Removal/Installation
in the Final Drive chapter).
Rotate the rear wheel to inspect the drive chain for damaged
rollers, and loose pins and links
If there is any irregularity, replace the drive chain.
Lubricate the drive chain if it appears dry.
...