[A] The Mil Comes On/Flashes And Engine Operation Is Not Normal; [B] The Mil Does Not Come On, But The Engine Operation Is Not Normal - Yamaha MT-09 2021 Service Manual

EAS33147

[A] THE MIL COMES ON/FLASHES AND ENGINE OPERATION IS NOT NORMAL

1. Check the DTC of "malfunction" using the YDT.
2. Delete the DTC using the YDT. (Only for *1)
3. Check and repair the malfunction according to applicable DTC troubleshooting.
4. Turn the main switch from "OFF" to "ON", and then check the DTC of "malfunction" is not displayed.
TIP
• If another DTC is displayed, repeat steps (1) to (4) until no DTC is displayed.
• Turning the main switch to "OFF" will not erase the malfunction history.
EAS33148

[B] THE MIL DOES NOT COME ON, BUT THE ENGINE OPERATION IS NOT NORMAL

1. Monitor the operation of these sensors and actuators by using the YDT in the diagnostic mode.
Refer to "DIAGNOSTIC CODE: SENSOR OPERATION TABLE" on page 9-76 and "DIAGNOSTIC
CODE: ACTUATOR OPERATION TABLE" on page 9-80.
01: Throttle position sensor signal 1 (throttle angle)
13: Throttle position sensor signal 2 (throttle angle)
14: Accelerator position sensor signal 1 (throttle angle)
15: Accelerator position sensor signal 2 (throttle angle)
30: Cylinder-#1 ignition coil
31: Cylinder-#2 ignition coil
32: Cylinder-#3 ignition coil
36: Injector #1
37: Injector #2
38: Injector #3
If a malfunction is detected in the sensors or actuators, repair or replace all faulty parts.
If no malfunction is detected in the sensors and actuators, check and repair the inner parts of the en-
gine.
FUEL INJECTION SYSTEM
9-17