Tone Wheel Sync Procedure for P1309 Error – “RPM Bomb” (Aprilia/Guzzi Euro 5 and Euro 5+ Models)

Posted byGabriele MalaraPosted inProblems resolution

Applicable Models

Aprilia Tuono V4, RS660, Tuono 660, Tuareg 660 (from MY2021 onwards), and other vehicles equipped with Marelli Euro 5 / Euro 5+ ECUs.

Purpose

This procedure resolves the activation of the MIL (Malfunction Indicator Light) and clears the P1309 error code, which is related to a flywheel synchronization issue or false misfire detection.

p1309 error aprilia

Procedure Steps

  1. Engine Warm-Up
    • Begin the procedure with the engine cold and allow it to warm up to at least 80°C (176°F).
    • Starting from a cold engine has been shown to increase the success rate.
  2. Bike Setup
    • Ensure the bike is in neutral (N).
    • Position the bike upright on a rear paddock stand, with the side stand up.
  3. “RPM Bomb” Sequence
    • Perform 3 controlled throttle sweeps from idle to:
      • 10,000 RPM for V4 models
      • 8,000 RPM for parallel twin models (660)
    • Each rev should take approximately 2–3 seconds, with a brief hold at peak RPM before fully releasing the throttle.
    • Allow the bike to idle for a few seconds between each sweep.
    • Full sequence pattern: Idle > Rev > Idle > Rev > Idle > Rev > Idle
    • If done correctly, the MIL should turn off after the third rev cycle.
  4. If Unsuccessful
    • Repeat the entire 3-rev sequence once more.
    • Common reasons for failure include:
      • Inconsistent or abrupt throttle control
      • Not holding target RPM long enough
      • Poor idle behavior or unstable engine
      • Bike movement during the procedure
  5. If Still Unsuccessful
    • Stop the procedure once the radiator fans turn on (indicating the engine is hot).
    • Turn off the engine, allow it to cool down completely, and retry later from cold.

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