Yamaha FX Nytro 2008 Manuel D'atelier page 717

LOW COOLANT TEMPERATURE INDICATOR LIGHT, COOLANT TEMPERATURE WARNING
INDICATOR AND/OR WARNING LIGHT DO NOT COME ON.
Check the main fuse and ignition fuse.
Refer to "FUSE INSPECTION" in CHAPTER 2.
FAULTY
OK
Check the battery.
Refer to "BATTERY INSPECTION" in CHAPTER 2.
OUT OF SPECIFICATION
OK
Check the engine stop switch and main switch.
Refer to "IGNITION SYSTEM".
FAULTY
OK
Check the coolant temperature sensor.
FAULTY
OK
Check the signal system wiring.
Refer to "CIRCUIT DIAGRAM".
FAULTY
OK
Correct the connection and/or replace the
speedometer unit and/or ECU.
SIGNAL SYSTEM
Replace the main fuse and/or ignition fuse.
Replace or charge the battery.
Refer to "BATTERY INSPECTION" in CHAPTER
2.
Replace the right handlebar switch and/or main
switch.
Replace the coolant temperature sensor.
Properly connect or repair the signal system wir-
ing.
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ELEC