Exam 9: Diagnosing 4wd and Awd Control Systems Advanced Four-Wheel-Drive Systems

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?

Clutches, viscous couplings, Torsen, and Quaife differentials are used in place of the differential in what types of vehicles.

An open differential sends power to which axle?

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

A viscous coupling differential sends power to which axle?

What are the two advantages claimed by AWD Subarus as a result of sending 90 percent of the engine's power to the front wheels?

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?

Many AWD vehicles are based on _____ vehicles.

Technician A says all-wheel drive vehicles spread the tractive effort to all four driving wheels. Technician B says all-wheel drive vehicles operating under normal conditions are driving in 2WD. Who is correct?

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

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

The purpose of the interaxle differential is to compensate for differences in front-wheel and rear-wheel speeds such as when turning a corner.

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

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

What is the difference between 4WD and AWD systems?

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 viscous coupling must be used with a center differential.

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

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

How does the Honda/Acura VTM-4 system control torque for the rear differential?