Exam 128: Hydraulic Components and Control Systems

Late model vehicles use ________ to change gear ratios in the automatic transmission.

Technician A says most transmission hydraulic valves are spool valves. Technician B says the recessed areas of a spool valve are called grooves. Which technician is correct?

Which of these is the most current version of GM's Dexron ATF?

Technician A says electronic transmissions control shifts by directing the shift solenoid output pressure to the bands and clutches. Technician B says electronic transmissions control shifts by directing the shift solenoid output pressure to the shift valves. Who is correct?

Technician A says shift solenoids are used on some transmissions to control upshifts and downshifts.Technician B says governor pressure is used on some transmissions to control upshifts and downshifts. Who is correct?

A TFT sensor is a ________.

What part controls mainline pressure in an electronically shifted automatic transmission?

The major types of oil pumps used in an automatic transmission are

Check balls used in the valve body are constructed of ________.

Technician A says that the transmission hydraulic pump operates only when the vehicle is in motion.Technician B says that the transmission hydraulic pump operates when the engine is running. Which technician is correct?

What is the part of the planetary gearset called that is being held by a band?

The steel plates in a clutch pack are commonly called ________.

Two technicians are discussing one-way clutches. Technician A says that a sprag and a roller are two types of one-way clutches. Technician B says that a one-way clutch could be installed upside down and cause the automatic transmission/transaxle to not function correctly. Which technician is correct?

Two technicians are discussing automatic transmission/transaxle oil pumps. Technician A says that aVane-type pump is a positive displacement pump. Technician B says that the pump is driven by the torque converter. Which technician is correct?

What is the purpose and function of an accumulator?

Technician A says ATF is used to cool, clean, and lubricate an automatic transmission. Technician B says ATF is used to operate the shift valves, and transmit engine torque. Who is correct?

Technician A says that the mainline pressure is usually higher in manual first or manual second gear than it is when the gear selector is in the drive position. Technician B says that mainline pressure is higher in reverse than when the gear selector is in the drive position. Which technician is correct?

Technician A says that hydraulic pressure affects transmission shift points. Technician B says that hydraulic pressure affects the feel of transmission shifts. Which technician is correct?

Technician A says that most pressure regulating valves work by balancing hydraulic pressure against a spring force. Technician B says that electronic transmissions use solenoids to further regulate hydraulic pressure. Which technician is correct?

Which valve is controlled by the position of the gearshift selector?