Exam 21: Continuously Variable Transmissions

Technician A says that a traditional transmission can operate at pressures that can be tested with a normal transmission pressure gauge. Technician B says that a CVT transmission needs a pressure transducer and a DSO to view pressures. Who is correct?

Technician A says some manufacturers have programmed into the power train control module (PCM) regular shift points for their continuously variable transmission (CVT), at which the pulley sheaves will move to predetermined positions to create the feel of separate conventional shifts. Technician B says some manufacturers allow the driver to manually shift through these predetermined pulley diameters while driving the vehicle. Who is correct?

Technician A say the most common type of continuously variable transmission (CVT) today is the variable-diameter pulley transmission. Technician B says the variable-diameter pulley (VDP) transmission has two pulleys that are in direct contact with each other. Who is correct?

Technician A says that on a vehicle with a VDP CVT, when the vehicle starts from a stop, the input pulley has a small diameter while the output pulley has large diameter. Technician B says that VDP CVT's typically use a separate electric motor for reverse. Who is correct?

Technician A says a variable-diameter pulley (VDP) system operates using two variable diameter pulleys with either steel or a rubber belt between them. Technician B says the rubber belt operates much quieter than a steel belt, so most vehicle manufacturers use them. Who is correct?

At high speed, the gear ratio of the pulleys is:

Most CVT transmissions operate at higher pressures than a traditional transmission.

Tech A states that a CVT belt must be installed in the correct direction or the transmission will slip. Tech B states that CVT belts are lubricated using splash lubrication from the transmission case. Who is correct?

Technician A says belt tension on a variable-diameter pulley (VDP) system is maintained by a large spring on the output shaft pulley. Technician B says the tension spring on a variable-diameter pulley (VDP) system causes the sheaves of the output pulley to be close together, creating a larger diameter pulley. Who is correct?

Technician A says belt tension on a variable-diameter pulley (VDP) is maintained by a large spring on the output shaft pulley. Technician B says the tension spring causes the sheaves of the output pulley to be close together, creating a larger diameter pulley. Who is correct?

Technician A says the electronic continuously variable transmission is used in Toyota and Ford hybrid vehicles. Technician B says the variable-diameter pulley continuously variable transmission (CVT) is the most common type of CVT being used in vehicles today. Who is correct?

In the Toroidal Continuously Variable Transmission (CVT) design, power is transferred from the input disc to the output disc through a set of variable-angle _______.

Technician A says most manufacturers use a multi-disc clutch pack and a set of planetary gears to allow the continuously variable transmission (CVT) to operate in reverse. Technician B says Ford Motor Company uses these planetary gear sets to create a two-speed CVT. Who is correct?

Choose the correct statement.

Which type of continuously variable transmission operates using two variable-diameter pulleys with either a steel or rubber belt between them?

Technician A says belt tension on a variable-diameter pulley (VDP) is maintained by a large spring on the output shaft pulley. Technician B says the tension spring causes the sheaves of the output pulley to be close together, creating a larger diameter pulley. Who is correct?

Tech A states that toroidal CVTs are commonly sold by manufacturers. Tech B states that toroidal transmissions are expensive to manufacture. Who is correct?

Early continuously variable transmissions, known as ECVT, are not suitable for hybrid vehicle applications.

Which of these is likely to be used in a modern variable pulley continuously variable transmission (CVT)?

Technician A says that a sheave should be inspected for any wear marks. Technician B says that if there are any groves in a sheave it can cause the belt to get stuck on the groove. Who is correct?