Throttle Position Re-learn Procedure
(VCMTUNER / VCMTUNER II)

⚠️ Critical Safety Warning This procedure requires running the vehicle's engine while stationary. You must perform this outside in a well-ventilated area. Never run a vehicle inside a closed garage or enclosed space due to the extreme danger of carbon monoxide poisoning.
VCMTUNER II (Advanced/Auto)

The VCMTUNER II features an auto-diagnostic mode that allows you to run the throttle position re-learn procedure without having to disconnect the unit or leave the cabin of your vehicle.

  1. Warm Up: Drive the vehicle for 5–10 minutes to bring it up to standard operating temperature.
  2. Park: Park the vehicle, leave the engine running, and fully engage the emergency parking brake.
  3. Trap the Heat: Ensure the hood remains closed to allow the Engine Coolant Temperature (ECT) to climb.
  4. Rev the Engine: While in Park, rev the engine to approximately 3,000 RPM for 2–3 minutes to generate excess heat.
  5. Monitor Temp: Using an OBD2 scan tool, watch the ECT transition to 194°F or higher. (You can leave your scan tool hooked up the entire time to watch the process.)
  6. Idle: Once the temperature reaches 194°F (or slightly higher), let the vehicle idle completely untouched for at least 10 minutes to complete the TPS re-learn.
💡 Pro-Tips for the VCMTUNER II Aim for 200°F: We recommend trying to hit closer to 200°F rather than exactly 194°F. This provides a buffer so the temperature does not accidentally drop below the threshold while idling.
No Movement: The unit must detect that the car is running at a strict idle with zero forward movement for a sustained duration to properly engage this diagnostic mode.
Manual Bypass Alternative If you experience any issues getting the auto-diagnostic mode to trigger, you can temporarily bypass it. Connect a wire from the green spade terminal on the VCMTUNER II directly to the battery ground. This immediately enables the factory VCM system, allowing you to perform a standard factory TPS re-learn.
VCMTUNER (Manually Adjusted Dial)

If you are utilizing the original, dial-adjusted VCMTUNER, follow these steps:

  1. Document Settings: Use your phone to take a clear picture of the current dial position on your unit so you do not lose your calibration.
  2. Zero the Unit: Turn the dial on the VCMTUNER completely to zero (0).
  3. Re-Learn: Perform the standard Honda TPS re-learn procedure (you may utilize the warm-up and idle steps detailed in the VCMTUNER II instructions above).
  4. Restore Settings: Once the re-learn is fully complete and the engine is off, reference your photo and adjust the dial back to its previous position.