Yamaha SuperJet: Throttle Response and Idle with Electronic Throttle Valve

The 4-stroke SuperJet has an electronic throttle valve that the lever controls via sensors. If throttle response hangs or jerks, M-JET DIAGNOSTIC shows the live values.

What you check

• APS1 and APS2: do both run smoothly with the throttle lever?
• TPS1 and TPS2: does the valve follow the setpoint?
• Throttle lever closed-position switch (code 51)
• After cleaning: teach idle and throttle valve

Watch for jumps

On a stand-up especially, lever and wires are exposed to impacts and water. A signal that jumps when giving gas smoothly speaks for a contact fault at the sensor or connector. If all signals run cleanly, you check ignition and injectors. The throttle valve is safety-relevant, so unclear findings should be checked by a specialist workshop. Also note the SuperJet's learner mode (L-mode): it limits power and feels like a power loss.

Related topics

• Yamaha SuperJet: Overheating in Shallow Water and Sand in the Inlet
• Used Yamaha SuperJet: Freestyle or Racing? Check the Hours
• Yamaha WaveRunner Rough Idle: Diagnostics
• 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.