M-JET DIAGNOSTIC · YAMAHA
Yamaha 1.9 Litre: Classify the Thermo Sensor Message (Code 41)
The 1.9-litre models have an additional thermo sensor entry in the fault memory. M-JET DIAGNOSTIC helps you classify it.
How to proceed
- Look at code 41 in the fault memory: active or stored?
- Compare the thermo sensor value and engine temperature (15)
- Watch exhaust manifold water temperature (65) over time
- Check connector and wire to the sensor
Plausible or not?
If the thermo sensor value fits the other temperatures, the message is probably a sporadic contact fault. If it deviates strongly or jumps, the sensor or its wire is the better candidate. Reading and recording gives you the arguments for it.
Related topics
- Yamaha 1.9 Litre: Knock Sensor (Code 17) and Ignition Timing
- Yamaha 1.9 Litre: RiDE, SCU and RPS on FX, GP and VX
- Reading Yamaha WaveRunner Fault Codes
- 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.
