TBA

📖 YOUCANIC Automotive Glossary

TBA (Throttle Body Alignment), also called Throttle Body Adaptation or Throttle Relearn, is a scanner procedure that recalibrates the electronic throttle control system’s learned parameters after the throttle body has been cleaned or replaced. The ECU stores adaptation values for the throttle plate’s closed position, wide-open position, and the relationship between pedal input and plate angle. These values compensate for carbon buildup, motor friction, and spring tension changes over time. When you clean or replace the throttle body, these learned values no longer apply.

Without performing TBA after cleaning, the engine typically idles too high (the ECU is still commanding extra opening to compensate for carbon that no longer exists), surges, or stalls. The YOUCANIC UCAN-II TBA procedure commands the ECU to perform a complete recalibration — cycle the throttle through its full range while recording new position values. Some vehicles require engine off during relearn; others need engine running at idle. After successful TBA, idle should settle to normal range (typically 650-750 RPM). If issues persist, check for vacuum leaks or a failing throttle body motor.