Yamaha YZF-R1 Series Service Manual page 460

QSS (Quick Shift System) does not operate.
1. Check that the malfunction indicator
light 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 effective.
(Check whether the "QS
is displayed at the top of the meter.)
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
DIAG 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 8-19.
OK ↓
Replace the ECU.
Refer to "REPLACING THE ECU (En-
gine Control Unit)" on page 8-41.
NG →
Repair the faulty parts.
NG →
Check the QSS operating conditions ex-
plained in the owner's manual and operate
the QSS accordingly.
NG →
Activate the QSS. (Set the QSS to a set-
" icon
ting other than "OFF".)
NG →
Operate while the "QS
NG →
Repair the gear position sensor.
NG →
Connect the gear position sensor coupler.
NG →
Repair the switch if it is not normal.
NG →
Replace the shift sensor.
NG →
Properly connect or repair the signaling
system's wiring.
8-25
SIGNALING SYSTEM
" icon is lit.