Yamaha MT-09 2021 Service Manual page 392

QSS (Quick Shift System) does not operate.
1. Check that the MIL does not come
on.
OK↓
2. Check that the QSS is working un-
der normal QSS operating condi-
tions.
OK↓
3. Make sure that the QSS is effec-
tive.
(Check whether the "QS
is displayed at the top of the me-
ter.)
OK↓
4. Are you operating while the
"QS " icon is lit?
OK↓
5. Is the transmission gear display
normal?
OK↓
6. Check the connection of the cou-
pler between the gear position sen-
sor and the ECU.
OK↓
7. Are the clutch and neutral switches
normal?
OK↓
8. Check the shift sensor value in the
diagnostic mode.
2.5 V when the shift pedal is not be-
ing operated.
4.5 V when the shift pedal is
pressed fully in.
0.5 V when the shift pedal is
pushed fully up.
OK↓
9. Check the entire signaling sys-
tem's wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-29.
OK↓
NG→
NG→
" icon NG→
NG→
NG→
NG→
NG→
NG→
NG→
8-37
SIGNALING SYSTEM
Repair the faulty parts.
Check the QSS operating conditions ex-
plained in the owner's manual and operate
the QSS accordingly.
Activate the QSS. (Set the QSS to a set-
ting other than "OFF".)
Operate while the "QS
Repair the gear position sensor.
Connect the gear position sensor coupler.
Repair the switch if it is not normal.
Replace the shift sensor.
Properly connect or repair the signaling
system's wiring.
" icon is lit.