Exam 10: Hydraulically Controlled Transmission

Some vehicles use a combined 1-2 and 2-3 shift valve.

Technician A says that the higher the engine load or the more the throttle is opened, the higher the line pressure. Technician B says that as vehicle speed increases, so does governor pressure. Who is correct?

All of the following statements are true except:

Under light load, a vacuum modulator gets what type of signal from the engine?

Technician A says that the higher the engine load or the more the throttle is opened, the higher the line pressure. Technician B says that as vehicle speed increases, so does governor pressure. Who is correct?

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

Technician A says that the throttle valve is controlled by a cable or linkage hooked to the engine throttle linkage. Technician B says that a misadjusted throttle valve cable can prevent wide open throttle (WOT) on an engine. Who is correct?

In a hydraulically controlled transmission, how is vehicle speed measured?

When adjusting a vacuum modulator, adjustments should be made in small increments to prevent shifting problems.

When the transmission is shifted into drive, fluid moves through the 1-2 shift valve and into the:

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?

Line pressure in an automatic transmission needs to be regulated to help control the quality of the shift.

When governor pressure exceeds 1-2 shift valve spring pressure, the port to the first gear clutch or band is shut, releasing it.

Typically, a directly mounted governor to the output shaft has how many valves?

Technician A says transmissions can prevent a downshift that would exceed the engine's maximum rpm. Technician B says reverse only uses one speed so line pressure is directly applied by the manual valve to the appropriate apply devices. Who is correct?

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?

When in reverse, governor pressure and throttle/modulator pressure are sent to the:

As governor pressure increases, it pushes on the shift valves towards their upshift position. What determines the sequence in which the shift valves move?

Technician A says that a malfunctioning governor can cause a shifting problem between first and second gear. Technician B says that a broken shift valve spring can cause a shifting problem. Who is correct?

Transmission line pressure is varied based on engine load and the selection of certain gears to maintain the ideal application force of the clutches and bands.