Chapter 9

Technician A says viscous clutch biasing sends torque to the wheel with the least traction. Technician B says it will send torque to the wheel with the greatest traction. Who is correct?

B only

Viscous coupling differentials send power to the axle or wheel that has the least traction.

False

Electronically controlled valves, hydraulic pumps, and wet clutches are components found in a(n) _____.

Haldex clutch

When shifting from 4WD Auto to 4WD Low, most vehicles must be brought to a stop.

True

Many AWD vehicles are based on _____ vehicles.

FWD

AWD constantly provides power to front- and rear-drive axles.

True

Technician A says part-time four-wheel drive systems are manually operated. Technician B says all four-wheel drive systems are automatically controlled without driver involvement. Who is correct?

Both A and B (Unsure Not Neither)

A _____ is a geared, torque-sensitive mechanical limited-slip differential that uses worm

gears to "sense" torque on one shaft.

Torsen

Technician A says a transfer case may have a limited-slip, viscous-type clutch assembly. Technician B says a transfer case may have a multiple plate clutch assembly for limited slip. Who is correct?

both A and B

A viscous coupling must be used with a center differential.

False

Which statement concerning turning a corner with a 4WD system is correct?

The front wheels travel a greater distance than the rear wheels.

Shifting between _____ can be done at a stop or while driving at any speed.

4WD-Auto and 4WD-High

Technician A says operating a vehicle in 4WD-Low on dry pavement increases tire wear. Technician B says driveline components may be damaged by operating in 4WD-High on drive pavement. Who is correct?

both A and B

Integrated full-time 4WD systems use _____ controls to enhance full-time operation.

computer

A 4WD vehicle are designed to operate optimally in 4WD-High and 4WD-Low on any road or off-road condition.

False

When the transfer case is in the lock position, the vehicle should be _____.

on a limited traction surface

Technician A says the Haldex clutch uses hydraulic pressure to regulate torque between the front and rear axles. Technician B says the Quaife differential uses clutches to regulate torque between front and rear axles. Who is correct?

A only

Many late-model vehicles with 4WD systems have the ability to automatically switch from 2WD to 4WD.

True

During turns, the front wheels travel a shorter distance than the rear wheels.

False

Technician A says electronically controlled systems may use sensor inputs to control the center differential for front-rear torque bias. Technician B says the Porsche PTM system uses an electronically controlled motor in the transfer case. Who is correct?

both A and B