Yamaha R15 2022 Service Manual page 356

The coolant temperature warning light fails to come on.
1. Check the coolant temperature
sensor.
Refer to "CHECKING THE COOL-
ANT TEMPERATURE SENSOR"
on page 8-152.
OK ↓
2. Check the entire signaling system's
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-16.
OK ↓
Replace the ECU or meter assembly.
Refer to "REPLACING THE ECU
(engine control unit)" on page 8-142
SIGNALING SYSTEM
NG →
Replace the coolant temperature sensor.
NG →
Properly connect or repair the signaling
system's wiring.
8-23
ELEC – +