Transmission & Drivetrain Servicing Flashcards

In a transverse-engine VW 4MOTION system, what component varies torque delivered to the rear axle?

Answer: An electronically controlled multi-plate (Haldex) clutch at the rear axle

Transverse 4MOTION uses a Haldex-type electro-hydraulic multi-plate clutch ahead of the rear differential.

A customer's 4MOTION vehicle shows Haldex coupling wear; the tech finds one new tire with three worn tires. Why is this relevant?

Answer: Mismatched rolling circumference makes the coupling slip constantly

Different tire diameters create a constant speed difference front-to-rear, overworking the coupling.

On a transverse 4MOTION vehicle, the angle drive (power take-off unit) is lubricated by:

Answer: Its own separate gear oil

The angle drive has its own gear oil supply separate from the transmission and Haldex coupling.

Which statement about the rear final drive and Haldex coupling oil on most 4MOTION vehicles is correct?

Answer: They use separate oil supplies requiring separate service

The rear differential gear oil and the Haldex coupling oil are separate and serviced individually.

A tech hears a clunk from a DSG when shifting from Park to Drive and wants live data. Which value is most useful to check first?

Answer: Transmission fluid temperature and clutch engagement values

Clutch engagement data and fluid temperature reveal adaptation or hydraulic issues causing harsh engagement.

What is the main purpose of the shift lock solenoid on a VW automatic selector lever?

Answer: To prevent shifting out of Park without the brake pedal applied

The shift lock keeps the lever in P (or N) until the brake pedal is pressed for safety.

On many VW manual transaxles, the clutch is released by which type of hydraulic component?

Answer: A concentric slave cylinder (CSC) around the input shaft

Many VW manuals use a concentric slave cylinder that combines the slave and release bearing.