ADT Transmission & Drivetrain Systems 3

Question 1

What symptom would most likely indicate a failed multiplate clutch pack inside the rear differential of an Audi Sport Differential?

Accepted Answer

Understeer in tight corners with no torque vectoring effect

Answer

The Sport Differential uses active clutch packs to vector torque between rear wheels; a failed clutch pack eliminates torque vectoring, causing understeer instead of the intended oversteer-correction.

Question 2

An Audi A4 with a CVT (Multitronic) shows DTC P0868 — Transmission Fluid Pressure Low. What is the first diagnostic step?

Accepted Answer

Check the transmission fluid level and condition

Answer

Low fluid pressure is often caused by low or degraded fluid; verifying the fluid level and condition is always the first step before assuming internal component failure.

Question 3

Which Audi quattro system uses an electronically-controlled multi-plate clutch to variably distribute torque and does NOT use a mechanical center differential?

Accepted Answer

Haldex quattro (transverse platform)

Answer

The Haldex-based quattro system used on transverse-engine Audis employs an electronically-controlled multi-plate clutch in place of a traditional mechanical center differential.

Question 4

A DSG-equipped Audi enters limp mode with DTC P17BF stored. P17BF relates to the mechatronic unit internal fault. Before ordering a replacement, what should the technician do first?

Accepted Answer

Check for software updates and reflash the mechatronic unit

Answer

Many mechatronic internal faults are resolved by software updates; reflashing should always be attempted before condemning and replacing hardware.

Question 5

On an Audi with a quattro ultra system, under what condition does the rear axle automatically disconnect?

Accepted Answer

When sensors predict no need for AWD to improve fuel efficiency

Answer

quattro ultra predictively disconnects the rear axle and disengages the propshaft to reduce drag and improve fuel economy when AWD is not needed, reconnecting proactively before slip occurs.

(ADT) Audi Diagnostic Technician Practice Test

(ADT) Audi Diagnostic Technician Practice Test

ADT Transmission & Drivetrain Systems 3