Mitsubishi Throttle relearn

How to Perform a Throttle Relearn on Mitsubishi Vehicles

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How to Perform a Throttle Relearn on Mitsubishi Vehicles

Performing a throttle relearn procedure on your Mitsubishi vehicle can help resolve issues with idle speed, acceleration, and overall engine performance. This comprehensive guide will walk you through the throttle relearn process for various Mitsubishi models and provide expert tips to ensure success.

What is a Throttle Relearn?

A throttle relearn, also known as an idle relearn or throttle body adaptation, is a process that allows the engine control unit (ECU) to recalibrate the throttle position sensor and idle air control valve. This procedure is often necessary after cleaning or replacing the throttle body, disconnecting the battery, or when experiencing drivability issues.

Mitsubishi Models That May Require a Throttle Relearn

The throttle relearn procedure applies to many Mitsubishi models equipped with electronic throttle control systems, including:

  • Lancer (2008-2017)
  • Outlander (2007-2020)
  • Eclipse (2006-2012)
  • Galant (2004-2012)
  • Endeavor (2004-2011)
  • Mirage (2014-2020)
  • RVR/ASX/Outlander Sport (2011-2020)
  • Pajero/Montero (2006-2019)
  • Triton/L200 (2006-2019)

It’s important to note that the specific procedure may vary slightly between models and model years. Always consult your vehicle’s service manual for the most accurate information.

General Throttle Relearn Procedure

While the exact steps may vary, here’s a general throttle relearn procedure that works for many Mitsubishi vehicles:

  1. Ensure the engine is completely cold before starting the process.
  2. Disconnect the negative battery terminal for about 5 minutes, then reconnect it.
  3. Turn the ignition key to the “ON” position (do not start the engine) and wait for 2 minutes.
  4. Turn the key back to the “OFF” position and wait for 10 seconds.
  5. Repeat steps 3 and 4 two more times.
  6. Start the engine and let it idle for at least 15 minutes without touching the accelerator pedal. Ensure all electrical accessories (A/C, radio, lights) are turned off during this time.
  7. After 15 minutes, turn off the engine and wait for at least 20 seconds.
  8. Start the engine again and let it idle for another 5 minutes.
  9. Take the vehicle for a short drive, gradually increasing speed and allowing the engine to experience various load conditions.

Model-Specific Procedures

Mitsubishi Lancer (2008-2017)

For Lancer models, follow these steps:

  1. Warm up the engine to normal operating temperature.
  2. Turn off the engine and wait for at least 10 seconds.
  3. Start the engine and let it idle for 3 minutes.
  4. Turn off the engine and wait for another 10 seconds.
  5. Repeat steps 3 and 4 two more times.
  6. After the third cycle, leave the engine running for at least 15 minutes.

Mitsubishi Outlander (2007-2020)

The Outlander procedure is similar to the general method:

  1. Disconnect the negative battery terminal for about 1 minute.
  2. Reconnect the battery.
  3. Turn the key to the “ON” position (don’t start the engine) and wait for 2 minutes.
  4. Start the engine and let it idle for 5 minutes.
  5. Drive the vehicle at low speeds (max 25 mph) for 5 minutes.
  6. Gradually increase speed and continue driving normally.

Mitsubishi Mirage (2014-2020)

For the Mirage, follow these steps:

  1. Ensure the engine is cold.
  2. Disconnect the negative battery terminal for about 1 minute.
  3. Reconnect the battery.
  4. Insert the key and turn it to the “ON” position (don’t start the engine) for 1-2 minutes.
  5. Turn the key to the “OFF” position, then start the engine.
  6. Let the car idle for 10 minutes with all accessories off.
  7. Idle for another 10 minutes with all accessories on.
  8. Increase RPM to about 3000 and maintain until the radiator fan cycles on and off a couple of times.

Expert Tips for a Successful Throttle Relearn

To ensure the best results from your throttle relearn procedure, consider the following expert tips:

  • Clean the throttle body: Before performing a relearn, thoroughly clean the throttle body using a specialized cleaner. This can help remove carbon deposits that may interfere with proper operation.
  • Check for error codes: Use an OBD-II scanner to check for any error codes before and after the relearn procedure. Clear any codes before starting the process.
  • Be patient: The relearn process can take time. Don’t rush through the steps, and allow the vehicle plenty of time to adapt during each phase.
  • Avoid interruptions: Once you start the procedure, avoid turning off the engine or disconnecting the battery until all steps are completed.
  • Monitor idle speed: Pay attention to the idle speed during and after the relearn process. It should stabilize at the correct RPM for your specific model.
  • Consider professional help: If you’re unsure about performing the procedure yourself or if issues persist, consider seeking help from a certified Mitsubishi technician.

Troubleshooting Common Issues

If you experience problems during or after the throttle relearn procedure, consider the following:

  • Persistent high idle: If the idle remains high after the relearn, check for vacuum leaks or a faulty idle air control valve.
  • Stalling or rough idle: This may indicate a problem with the mass airflow sensor or fuel injectors. Clean or replace these components as needed.
  • Check engine light: If the check engine light comes on after the relearn, use an OBD-II scanner to diagnose the issue.
  • No improvement: If you notice no change in performance, repeat the procedure or consult a professional mechanic for further diagnosis.

Final Words from Boss Erwin

Performing a throttle relearn on your Mitsubishi vehicle can help resolve various drivability issues and improve overall performance. By following the model-specific procedures and expert tips outlined in this guide, you can successfully complete the relearn process and enjoy smoother, more efficient operation of your Mitsubishi engine.