Checking The Warning Light - Yamaha MT-09 2021 Service Manual

EAS32859

CHECKING THE WARNING LIGHT

The warning light comes on after the main switch has been set to "ON". Refer to the following table for
lighting up time.
If the warning light still comes on, refer to a check item of a troubleshooting of each system, check and
repair it. If the warning light does not come on, the warning light (LED) may be defective.
TIP
• This engine equips self-diagnostic function. It's controlled delicately for detecting defective and mal-
function of the exhaust emission control system. Therefor, the vehicle modifying, poor maintenance,
and improper using of the vehicle may also become the cause of the MIL come on. These events may
cause the occurrence of the warning light coming on without malfunction.
• Reprogramming of the ECU software.
• Using the electrical accessory which may affect the ECU.
• Using the incorrect specification of spark plug and fuel injector. Using the third party accessories such
as suspension and exhaust system.
• Change of specifications of drive chain, sprocket, wheel and tire.
• Removing or modifying the O
• Poor maintenance of the drive chain and tire air pressure.
• Incorrect brake pedal height, rear brake dragging.
• Excessive opening and closing of the throttle grip, frequently used of burnout, wheelie and half clutch.
• Air mixture by fuel supply badness.
2
1
sensor, the exhaust system part (catalyst, etc.).
2
9-2
SELF-DIAGNOSTIC FUNCTION
3
ABS