M-JET DIAGNOSTIC · YAMAHA

Yamaha GP1300R: Unstable Idle, Check the Stepper Motor

The GP1300R regulates its idle with a stepper motor. If it is stiff or the connector is corroded, the speed hunts. With M-JET DIAGNOSTIC you activate the stepper motor and see whether it responds.

What you test

  • Fault memory: codes 84, 102 and 103 concern the stepper motor
  • Activate the stepper motor component test in the app
  • Live data: engine speed and step position at idle
  • Teach the idle after cleaning or replacement

Mechanical or electrical?

Audible and visible movement during the test speaks for a working motor; then the problem is more likely dirt in the air passage or false air. If every reaction is missing, check connector, wire and voltage. Because the three-cylinder has only three cylinders to supply, a single weak cylinder stands out strongly at idle. So also test the three ignition coils and injectors individually. In forums, a poor contact at the throttle position sensor is often named for idle and starting problems on the GP1300R: its live value must stay steady and be correct with the throttle closed.

Related 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.

To the M-JET DIAGNOSTIC for BRP ›