Yamaha R15 2022 Service Manual page 354

QS (Quick Shift System) does not operate.
1. Check that the engine trouble and
system warning light does not come
on.
OK ↓
2. Check that the QS is working under
normal QS operating conditions.
OK ↓
3. Make sure that the QS is effective.
(Check whether the "QS" icon is
displayed at the top of the meter.)
OK ↓
4. Check that the quick shift switch
coupler is connected.
OK ↓
5. Check the quick shift switch.
Refer to "DIAGNOSTIC CODE:
SENSOR OPERATION TABLE" on
page 8-44 and "CHECKING THE
SWITCHES" on page 8-139.
OK ↓
6. Check the gear position switch.
Refer to "DIAGNOSTIC CODE:
SENSOR OPERATION TABLE" on
page 8-44 and "CHECKING THE
SWITCHES" on page 8-139.
OK ↓
7. Check the entire signaling system's
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-16.
OK ↓
Replace the ECU.
Refer to "REPLACING THE ECU
(engine control unit)" on page 8-142.
SIGNALING SYSTEM
NG →
Repair the faulty parts.
NG →
Check the QS operating conditions
explained in the owner's manual and
operate the QS accordingly.
NG →
Activate the QS. (Set the QS to a setting
other than "OFF".)
NG →
Connect the quick shift switch coupler.
NG →
Replace the quick shift switch.
NG →
Replace the gear position switch.
NG →
Properly connect or repair the signaling
system's wiring.
8-21
ELEC – +