Question 1

What symptoms would be present if the governor circuit were to fail so that governor pressure were equal to line pressure at all times?
A) The transmission would never upshift from first gear.
B) The transmission would upshift late and harsh.
C) The transmission would upshift early and soft.
D) The transmission would never downshift from high gear.

Accepted Answer

The answer of What symptoms would be present if the...

Question 2

Line pressure is boosted by throttle pressure to increase holding force of clutches and brakes to prevent slipping.

Accepted Answer

Throttle pressure is used to increase line pressure in automatic transmissions, which enhances the holding force of clutches and brakes, preventing slipping.

Question 3

How can pump output (line) pressure be controlled in an automatic transmission?
A) Mechanical pressure control
B) Electronic pressure control
C) A fixed displacement vane pump
D) Both A and B

Accepted Answer

Pump output pressure in an automatic transmission can be controlled using both mechanical and electronic pressure control methods.

Question 4

A mechanical pressure control regulator valve is a simple mechanism that uses a spring and a _______ to dump excess fluid back to the transmission pan.
A) Poppet valve
B) Spool valve
C) Check ball
D) Pinion

Accepted Answer

The answer of A mechanical pressure control regulator valve is...

Question 5

Technician A says a pressure control valve spring can be assisted by applying hydraulic pressure along with spring pressure. Technician B says a pressure control valve spring can be assisted by applying linkage pressure along with spring pressure. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Accepted Answer

Both technicians are correct because a pressure control valve spring can be assisted by applying either hydraulic pressure or linkage pressure along with spring pressure.

Question 6

Technician A says high-performance rebuild kits often contain a stiffer pressure-regulating spring to increase pump pressure. Technician B says on older mechanical pressure regulated transmissions, it was a common practice to install a small washer behind the spring to increase the regulated pump pressure on high-performance transmissions. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Accepted Answer

Both Technician A and Technician B are correct. High-performance rebuild kits often include a stiffer pressure-regulating spring to increase pump pressure, and it was also common practice to use a washer to increase pressure in older mechanical systems.

Question 7

Which of these is least likely to cause harsh shifting during normal cruising speeds?
A) High line pressure
B) Low line pressure
C) Broken or missing accumulator spring
D) None of the above

Accepted Answer

Low line pressure is least likely to cause harsh shifting; it typically results in soft or delayed shifts.

Question 8

Technician A says as engine load increases, the line pressure in a transmission must increase for greater holding force in clutches and bands. Technician B says some transmissions can achieve 200 pounds per square inch (psi) of line pressure during wide open throttle (WOT). Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Accepted Answer

Both technicians are correct. As engine load increases, the line pressure must increase to provide sufficient holding force in the transmission's clutches and bands. Additionally, some transmissions can indeed reach 200 psi of line pressure during wide open throttle conditions.

Question 9

Technician A says reverse and first gear require higher line pressure. Technician B says most transmissions use a boost valve to achieve higher line pressure in reverse and first gear. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Accepted Answer

Both Technician A and Technician B are correct. Reverse and first gear do require higher line pressure, and most transmissions use a boost valve to achieve this increased pressure.

Question 10

Technician A says to check the operation of the throttle valve boost, you do not need to disconnect the vacuum hose on a vacuum modulator and attach a vacuum pump to vary the line pressure. Technician B says to check the operation of the throttle valve boost, you need to connect a pressure gauge to the transmission line pressure test port. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Accepted Answer

Technician B is correct because checking the operation of the throttle valve boost involves connecting a pressure gauge to the transmission line pressure test port to measure the line pressure changes. Technician A's method is not related to checking throttle valve boost.

Question 11

The line pressure in an automatic transmission can be controlled by which of the following parts?
A) Mechanical pressure control regulator valve
B) Electronic pressure control solenoid
C) Both mechanical pressure control regulator valve and electronic pressure control solenoid
D) None of the above

Accepted Answer

Both the mechanical pressure control regulator valve and the electronic pressure control solenoid can control the line pressure in an automatic transmission.

Question 12

Technician A says high-performance automatic transmission rebuild kits often contain a stiffer pressure-regulating spring to increase transmission pump pressure. Technician B says that on older mechanical pressure regulated transmissions, it was a common practice to remove the pressure regulator valve to increase the regulated pump pressure on high-performance transmissions. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Accepted Answer

The answer of Technician A says high-performance automatic transmission rebuild...

Question 13

When fluid pressure overcomes the spring of the line pressure regulator, the valve moves opening a fluid passage to exhaust fluid to the transmission cooler.

Accepted Answer

The answer of When fluid pressure overcomes the spring of...

Question 14

When the spring pressure of a mechanical line pressure regulator valve is overcome, excess fluid is returned to the transmission pan.

Accepted Answer

When the spring pressure is overcome, the valve opens, allowing excess fluid to bypass and return to the transmission pan, maintaining proper pressure levels.

Question 15

Technician A says typically on hydraulic controlled transmissions, downshifting was often accomplished through the use of a kickdown valve. Technician B says in some transmissions, the kickdown valve was called a detent valve. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Accepted Answer

Both Technician A and Technician B are correct. Hydraulic controlled transmissions often used a kickdown valve for downshifting, and in some cases, this valve was referred to as a detent valve.

Question 16

Technician A says a kickdown moves a valve inside a transmission when the accelerator is pressed all the way down. Techniican B says the kickdown valve opens a passage, allowing full line pressure to pass the kickdown valve to increase throttle pressure. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Accepted Answer

Both Technician A and Technician B are correct. A kickdown mechanism in a transmission involves moving a valve when the accelerator is fully pressed, which opens a passage to allow full line pressure to increase throttle pressure.

Question 17

Which of the following is a method of operating a kickdown?
A) Linkage
B) Electric solenoid
C) Cable
D) All of the above

Accepted Answer

All the listed options (linkage, electric solenoid, and cable) are methods used to operate a kickdown in automatic transmissions.

Question 18

Technican A says on vehicles that use a kickdown solenoid, a switch can be mounted under the accelerator pedal. Technician B says on vehicles that use a kickdown solenoid, a switch can be mounted to the throttle linkage on the engine. Who is correct?
A) Technician A HYPERLINK "http://cdx.cognero.com/Instructor/TestGenerator.aspx"
B) Technician B
C) Both A and B
D) Neither A nor B

Accepted Answer

Both Technician A and Technician B are correct. A kickdown solenoid can have a switch mounted under the accelerator pedal or to the throttle linkage on the engine, depending on the vehicle design.

Question 19

When does the kickdown valve force downshifts?
A) Wide open throttle
B) Three-quarters open throttle
C) Half open throttle
D) One-quarter open throttle

Accepted Answer

The kickdown valve forces downshifts when the throttle is at wide open throttle to provide maximum acceleration.

Question 20

On vehicles equipped with a transmission kickdown solenoid, where can the kickdown switch be located?
A) Under the accelerator pedal
B) In the throttle pressure valve bore
C) Attached to the throttle linkage on the engine
D) Either A or C

Accepted Answer

The kickdown switch can be located either under the accelerator pedal or attached to the throttle linkage on the engine, as both locations are common for activating the kickdown solenoid in vehicles.

Quiz 10: Hydraulically Controlled Transmission

What symptoms would be present if the governor circuit were to fail so that governor pressure were equal to line pressure at all times?

Line pressure is boosted by throttle pressure to increase holding force of clutches and brakes to prevent slipping.

How can pump output (line) pressure be controlled in an automatic transmission?

A mechanical pressure control regulator valve is a simple mechanism that uses a spring and a _______ to dump excess fluid back to the transmission pan.

Technician A says a pressure control valve spring can be assisted by applying hydraulic pressure along with spring pressure. Technician B says a pressure control valve spring can be assisted by applying linkage pressure along with spring pressure. Who is correct?

Which of these is least likely to cause harsh shifting during normal cruising speeds?

Technician A says as engine load increases, the line pressure in a transmission must increase for greater holding force in clutches and bands. Technician B says some transmissions can achieve 200 pounds per square inch (psi) of line pressure during wide open throttle (WOT) . Who is correct?

Technician A says reverse and first gear require higher line pressure. Technician B says most transmissions use a boost valve to achieve higher line pressure in reverse and first gear. Who is correct?

The line pressure in an automatic transmission can be controlled by which of the following parts?

When fluid pressure overcomes the spring of the line pressure regulator, the valve moves opening a fluid passage to exhaust fluid to the transmission cooler.

When the spring pressure of a mechanical line pressure regulator valve is overcome, excess fluid is returned to the transmission pan.

Technician A says typically on hydraulic controlled transmissions, downshifting was often accomplished through the use of a kickdown valve. Technician B says in some transmissions, the kickdown valve was called a detent valve. Who is correct?

Technician A says a kickdown moves a valve inside a transmission when the accelerator is pressed all the way down. Techniican B says the kickdown valve opens a passage, allowing full line pressure to pass the kickdown valve to increase throttle pressure. Who is correct?

Which of the following is a method of operating a kickdown?

Technican A says on vehicles that use a kickdown solenoid, a switch can be mounted under the accelerator pedal. Technician B says on vehicles that use a kickdown solenoid, a switch can be mounted to the throttle linkage on the engine. Who is correct?

When does the kickdown valve force downshifts?

On vehicles equipped with a transmission kickdown solenoid, where can the kickdown switch be located?