Yamaha FZR and FZS: Knock Sensor Message and Intake Air Temperature

On FZR and FZS, knock tendency and intake air temperature are closely linked. M-JET DIAGNOSTIC lets you watch both together.

What you watch

• Intake air temperature (code 23) over time under load
• Ignition timing: is it retarded?
• Knock sensor (code 17) in the fault memory
• Fuel: remember what was last filled

Typical constellation

Hot air, poor fuel or high engine temperature promote knock. The control unit reacts with later ignition and less power. In the recording you see the connection: temperature rises, ignition timing falls, power fades. If the message occurs with cold air and calm riding, however, a sensor or wire problem is more likely.

Related topics

• Yamaha FZR and FZS: Check the Intake Pressure Sensor (Code 29)
• Used Yamaha FZR and FZS: Hours in the High RPM Range
• Yamaha WaveRunner Knock Sensor Fault
• 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.