Exam 21: Continuously Variable Transmissions

Technician A says some manufacturers have programmed into the Powertrain 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 says that Variable Diameter Pulley (VDP) Continuously Variable Transmissions (CVT) will often have a planetary gear set to produce reverse. Technician B says that many CVTs in vehicles use a rubber drive belt between two pulleys to transfer power. Who is correct?

After reassembling a CVT transmission, the adaptive memory must be reset.

Technician A says the toroidal continuously variable transmission (CVT) can have a high gear ratio of approximately 4:1 to begin accelerating the vehicle. Technician B says when the rollers in a toroidal CVT are perpendicular to the input and output disc, the gear ratio is 1:1. Who is correct?

Technician A says that Variable Diameter Pulley (VDP) Continuously Variable Transmissions (CVT) will often have a planetary gear set to produce reverse. Technician B says that many CVT's in vehicles use a rubber drive belt between two pulleys to transfer power. Who is correct?

Tech A states that CVTs should not be rebuilt and should only be replaced with complete units. Tech B states that some manufacturers do not recommend rebuilding their CVTs. Who is correct?

Technician A says most manufacturers recommend repairing internal components of a continuously variable transmission (CVT). Technician B says specialty tools are required to compress the output pulley and reinstall the belt on most CVTs. Who is correct?

Tech A states that when replacing a CVT belt the sheaves should be checked for wear. Tech B states that the bearings might require replacement when replacing the belt. Who is correct?

In a Continuously Variable Transmission (CVT), what changes in a smooth step-less progression to suit speed and load conditions.

Most manufacturers of hybrid vehicles use a limited number of multi-disc clutch packs and a set of planetary gears to allow the transmission to operate in ________.

Tech A states that fluid pressure in a CVT should be checked with a transmission pressure gauge. Tech B states that pressures in a CVT will often exceed the range of a traditional gauge and will require the use of a pressure transducer. Who is correct?