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

Most full-time AWD systems give the driver the option of 2WD or 4WD.

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?

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

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.

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

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?

How are on-demand 4WD systems controlled?

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?

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

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

Provide a brief overview of the components associated with Mitsubishi? 's Super All Wheel Control (S-AWC) system?

What is a viscous transmission?

What does the acronym VTM-4 stand for?

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?

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

List and briefly describe the most common 4WD operational modes.

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

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

A device which allows the front and rear axles to rotate at different speeds in full-time 4WD and AWD systems works to eliminate driveline windup.