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

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

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

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?

What type of fluid is used in a viscous coupling case?

A _____ is a geared, torque-sensitive mechanical limited-slip differential that uses worm gears to "sense" torque on one shaft.

What is a viscous transmission?

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?

How are on-demand 4WD systems controlled?

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?

Name the main components of a typical viscous coupling labeled in the figure below.

Technician A says the interaxle differential solves the problem of driveline windup during turns. Technician B says the interaxle differential increases performance in poor traction conditions. Who is correct?

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

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

Explain the difference between full-time and part-time four-wheel drive.

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

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?

In addition to preventing wheel slip, what other conditions are eliminated by the BMW xDrive system?

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

A viscous coupling must be used with a center differential.