Deck 18: Electronic Throttle Control Systems

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 ________.

A) the air filter is restricted
B) there is a fault with the throttle system
C) the throttle cable is mis-adjusted
D) normal operation

Answer 1

D

Question 2

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

A) Brushless motor
B) Stepper motor
C) AC motor
D) DC motor

Answer 2

D

Question 3

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

A) 100 to 300 RPM
B) 500 to 600 RPM
C) 1600 to 1800 RPM
D) 1200 to 1500 RPM

Answer 3

D

Question 4

The accelerator pedal position sensor contains ________ separate sensors.

A) two
B) three
C) one
D) B or C, depending on the vehicle

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?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

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?

A) The engine will start but not idle
B) The engine will perform normally, but the cruise control will not work
C) The engine will start but not accelerate; idle speed between 1200 and 1600 RPM
D) None of the above

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?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 8

Identify the throttle position sensor assembly in this diagram.

A) A
B) B
C) C
D) D
E) E

Question 9

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

A) A
B) B
C) C
D) D

Question 10

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

A) 1, 2, 3, 4
B) 3, 5
C) 3, 5, 4, 6
D) 1, 2, 4, 6

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?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 12

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

A) idle control switch
B) throttle position sensor
C) throttle valve actuator
D) accelerator pedal position (APP) sensor

Question 13

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

A) Scan tool
B) Vacuum gauge
C) Pocket code reader
D) Spark tester

Question 14

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

A) a scan tool
B) a relearn tool
C) a vacuum gauge
D) the ignition switch