Yamaha 1.9 Litre: Knock Sensor (Code 17) and Ignition Timing

On the new 1.9-litre generation a knock sensor monitors combustion. If it reports a fault, M-JET DIAGNOSTIC helps distinguish a sensor problem from real knock.

What you look at

• Code 17 in the fault memory: active or stored?
• Ignition timing under load in the data logger
• Intake air temperature (23) and engine temperature (15)
• Connector and wire of the knock sensor

Evaluation

If ignition timing stays stable and the message comes anyway, the fault is mostly at the wire or connector. If ignition is retarded under load, the control unit detects real knock: fuel quality, temperatures and intake are then to be checked. If real knock is suspected, do not ride on.

Related topics

• Yamaha 1.9 Litre: RiDE, SCU and RPS on FX, GP and VX
• Yamaha 1.9 Litre FX, GP, VX Won't Start or Stalls
• 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.