Idle learn procedures for ETC (throttle-by-wire)-equipped vehicles are being discussed. Technician A says the learn or relearn procedure should be completed anytime the PCM has been replaced or updated, or after the throttle body has been cleaned or replaced. Technician B says the system does not need to relearn if the battery has been disconnected. The system will automatically go through the procedure when the engine is restarted.Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct because the PCM replacement or update and throttle body cleaning or replacement can affect idle settings, requiring a relearn. Technician B is also correct because many ETC systems automatically relearn idle settings after a battery disconnection when the engine is restarted.

Idle Learn Procedures for ETC (Throttle-By-Wire)-Equipped Vehicles Are Being Discussed