Idle Relearn (Throttle Adaptation)

It is needed after cleaning or replacing the throttle body. Some cars do it automatically. Others need a scan tool. Some procedures require the engine to be warm and electrical loads such as lights and air conditioning switched off, then idling for a set time without touching the pedal. Manufacturers describe the exact steps in service information, and a scan tool can confirm that the adaptation values have been stored.

The ECU stores new values for closed throttle position.

Without it, idle can be unstable. Battery disconnection can reset values.