Exam 44: Four- and All- Wheel Drive

Technician A says on-demand 4WD systems are controlled by the PCM/TCM. Technician B says when slip is detected at the rear wheels, the duty cycle to the output clutch at the transfer case is decreased. Who is correct?

Which of the following components is (are) NOT found in a transfer case?

Viscous clutches are being discussed. Technician A says if the clutch malfunctions, it must be replaced. Technician B says viscous clutch fluid must be checked periodically. Who is correct?

What is the function of locking hubs?

Technician A says some AWD systems have a center differential. Technician B says some AWD vehicles have a viscous clutch. Who is correct?

What is the disadvantage of manual locking hubs?

What is the difference between four wheel drive [4WD] and all wheel drive [AWD]?

A passenger car equipped with a 4WD system weighs approximately 170 pounds more than a similar 2WD car.

Interaxle differential construction is being discussed. Technician A says some are designed with a multiple-disc clutch pack. Technician B says cone brake clutches are not used. Who is correct?

If additional torque is required at all four wheels in a 4WD vehicle, the gear selector should be placed in the ____________________ position.

What is the purpose of the interaxle differential?

Many AWD vehicles are based on FWD vehicles and do not have a separate transfer case.

Interaxle differentials are being discussed. Technician A says the interaxle differential is located inside the front axle housing. Technician B says the interaxle differential is located inside the rear axle housing. Who is correct?

A 4WD transfer case engaged in 2-high or 4-high always provides power to the ____________________ wheels.

The ____________________ allows the front and rear axles to turn at slightly different speeds when the vehicle is in 4WD mode.

The following should be done before removing the transfer case EXCEPT:

Where is a viscous clutch used?

Name the three main driveline components that are added to a 2WD vehicle to make it a 4WD vehicle.

If the 4WD indicator light is flashing on and off, ______.

Two technicians are discussing tires for 4WD vehicles: Technician A says narrow tires tend to cut through snow and water rather than hydroplane over it. Technician B says 4WD and AWD systems allow the use of tires narrower than those used on 2WD vehicles. Who is correct?