Yamaha FX HO: Overheating, Exhaust Manifold Water Temperature (Code 65)
The FX HO has several temperature measuring points. If it reports overheating, the question is which point is too hot or reports wrongly. M-JET DIAGNOSTIC shows you the values side by side.
What you compare
- Code 15: engine temperature sensor
- Code 65: exhaust manifold water temperature
- Thermo switch in the switch status
- Curve at idle, planing and full load
Cooling or cavitation?
In forums, too little cooling water through cavitation or foreign objects in the inlet is often named as the cause of overheating messages. Then the values rise plausibly with load and you look in the water path. If only one of the two temperature values shows an outlier, its sensor or wire is the better lead. On real overheating do not ride on; shut the engine off.
Related topics
- Yamaha FX HO: Reverse Switch (78) and No-Wake Switch (68)
- Yamaha FX HO: Teach the Idle After Cleaning or Battery Change
- Yamaha WaveRunner Overheating and Temperature Sensor
- Diagnostics and fault codes for your Yamaha model
- All Yamaha WaveRunner diagnostics topics
Everything runs via app over Bluetooth, for Yamaha WaveRunners from model year 2002 to today. Learn more about the M-JET DIAGNOSTIC for Yamaha WaveRunner.
You also ride a Sea-Doo or Can-Am? The M-JET DIAGNOSTIC is available for BRP vehicles too.
