Yamaha GP1800R: Knock Sensor (Code 17) at Full Load

A GP1800R is often ridden at the limit. If the control unit reports the knock sensor there, the question is: sensor fault or real knock? M-JET DIAGNOSTIC gives you data for that.

What you look at

• Ignition timing over time under full load
• Intake air temperature (23) and engine temperature (15)
• Fault memory: code 17 active or stored?
• Condition of connector and wire at the knock sensor

How to tell the difference

If ignition is retarded under load, the control unit detects real knock: fuel, temperatures and intake are then the candidates. If ignition timing stays stable and the message comes anyway, it is mostly a wire or connector fault. If real knock is suspected, do not ride on but have the engine checked.

Related topics

• Yamaha GP1800R: Throttle Response Jerky, Check the Throttle Valve
• Yamaha GP1800R: Overheat Warning and Limp Mode
• 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.