When the ignition is first turned on a click noise is heard from under the hood of a vehicle equipped with ETC. Technician A says that this is the normal operation of the ETC self-test. Technician B says that the TAC motor should not move unless the engine is running. Which technician is correct?
A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question

Quizplus · Accepted Answer

Technician A is correct because the click noise heard from under the hood when the ignition is first turned on in a vehicle equipped with Electronic Throttle Control (ETC) is indeed part of the normal operation of the ETC self-test. This self-test involves the Throttle Actuator Control (TAC) motor moving to ensure the system is functioning correctly before the engine starts.

When the Ignition Is First Turned on a Click Noise