Question 1

A vehicle with an electronic throttle is idling with the transmission in PARK. When the accelerator pedal is pressed down, the engine does not increase above idle speed. This means ________.

Accepted Answer

D

Question 2

What type of electric motor is the throttle plate actuator motor?

Accepted Answer

D

Question 3

The default position varies depending on the vehicle and usually results in an engine speed of ________.

Accepted Answer

The default position usually results in an engine speed of 1200 to 1500 RPM, which allows for smooth idling and low-end power. Option A is too low and may cause stalling, while option B and C are too high and may result in higher fuel consumption and wear and tear on the engine.

Question 4

The accelerator pedal position sensor contains ________ separate sensors.

Accepted Answer

The accelerator pedal position sensor typically contains two separate sensors to ensure redundancy, improve reliability, and enhance the safety of the vehicle's throttle system.

Question 5

Technician A says that an electronic throttle control uses a stepper motor. Technician B says that an electronic throttle control uses is spring loaded to about 16% to 20% throttle opening. Which technician is correct?

Accepted Answer

Electronic throttle control systems typically use a DC motor, not a stepper motor, and they are often spring-loaded to a default position of about 16% to 20% throttle opening for safety reasons.

Question 6

After servicing the air filter on an ETC equipped vehicle, the technician has forgotten to connect the throttle motor wiring. What will happen when the vehicle is started?

Accepted Answer

If the throttle motor wiring is not connected on an ETC equipped vehicle, the engine will start but will not accelerate. The idle speed will remain between 1200 and 1600 RPM.

Question 7

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?

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.

Question 8

Identify the throttle position sensor assembly in this diagram.

Accepted Answer

The answer of Identify the throttle position sensor assembly in...

Question 9

Which component in this photograph is the drive (motor) gear?

Accepted Answer

The answer of Which component in this photograph is the...

Question 10

In this diagram, which terminals are used for the TP sensors?

Accepted Answer

The answer of In this diagram, which terminals are used...

Question 11

Technician A says that an electronic throttle control uses a stepper motor. Technician B says that an electronic throttle control uses a vacuum controlled stepper motor to keep the throttle at a 16%-20% throttle opening. Which technician is correct?

Accepted Answer

The answer of Technician A says that an electronic throttle...

Question 12

All electronic throttle control system includes the following components, EXCEPT ________.

Accepted Answer

The idle control switch is not a component typically included in an electronic throttle control system. The other three choices (throttle position sensor, throttle valve actuator, and accelerator pedal position sensor) are all commonly found in such systems.

Question 13

Which of these tools is needed when diagnosing an electronic throttle system?

Accepted Answer

A scan tool is needed when diagnosing an electronic throttle system. It allows the technician to access and read the system's codes and data for troubleshooting purposes. A vacuum gauge is used to diagnose problems in the engine's vacuum system, a pocket code reader is a less advanced version of a scan tool and can only read basic codes, and a spark tester is used to diagnose issues with the engine's ignition system.

Question 14

A throttle body relearn procedure uses ________ to relearn proper idle speed.

Accepted Answer

The answer of A throttle body relearn procedure uses ________...

Quiz 18: Electronic Throttle Control Systems