Exam 10: Hydraulically Controlled Transmission

Engine vacuum, atmospheric pressure and spring tension all work on the vacuum modulator diaphragm. Which of the following statements describes the action of these forces on the diaphragm?

When the governor pressure becomes great enough to overcome the spring pressure and the modulator/throttle valve pressure in the 2-3 shift valve, line pressure is allowed to flow to:

More line pressure is needed and governor pressure and modulator pressure/throttle valve pressure are not used in:

Technician A says that reciprocating force controls governor pressure. Technician B says that centrifugal force controls governor pressure. Who is correct?

Tech A says that modifying governor weights will alter transmission shifting. Tech B says that excessive modification of the governor weights may cause the transmission to not shift. Who is correct?

Which of the following describes the hydraulic pressure produce by the modulator valve at low engine vacuum?

When the transmission is in park, line pressure sent to the throttle valve is sent to the __________ when the throttle is closed and the vehicle is under no load.

Which of the following are spool valves that direct the flow of hydraulic oil to a clutch or band?

Technician A says that a vehicle can downshift by fully depressing the throttle, allowing full throttle pressure to overcome governor pressure. Technician B says that a vehicle may downshift when governor pressure drops below line pressure. Who is correct?

Some hydraulically controlled transmissions use a __________ in place of, or in addition to, a vacuum modulator.

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?

Which of the following is a type of automatic transmission uses a mainshaft and counter shaft, similar to a manual transmission?

What is another name for the kickdown valve?

Which of the following is a typical high-performance modification made to the transmissions governor?

The pressure entering the throttle valve pressure port is proportional to the amount of engine vacuum.

The pressure regulator valve keeps the pressure at a regulated level by exhausting excess pressure back to the ________.

Tech A says that a vacuum modulator converts manifold vacuum into an engine load signal. Tech B says that the manual valve is moved by governor pressure to force a shift. Who is correct?

If an automatic transmission only had a governor, and no throttle valve or vacuum modulator, what is the shift most lilely to be like?

Technician A says that greater clearances between the between the spool valve and the valve body increase sealing. Technician B says that the front pump is turned by the torque converter hub. Who is correct?

Which of the following are symptoms of a leaking vacuum modulator?