ADT Powertrain & Engine Management Systems 2

Question 1

On an Audi 2.0T TFSI engine, the Haldex-style front-to-rear torque split in quattro AWD is managed by which control unit?

Accepted Answer

Haldex control unit (HCUM)

Answer

The Haldex Control Unit Module (HCUM) independently manages the electronically controlled multi-plate clutch that distributes torque between front and rear axles.

Question 2

Which sensor provides the primary load signal to the ECM on Audi engines equipped with a Bosch Motronic ME 9.1 system?

Accepted Answer

Mass Air Flow (MAF) sensor

Answer

The MAF sensor is the primary load-sensing device in Bosch Motronic ME 9.1, providing direct air mass measurement for fueling calculations.

Question 3

An Audi 3.0 TFSI supercharged engine shows a P0234 code (turbocharger/supercharger overboost condition). What is the MOST likely first diagnostic step?

Accepted Answer

Check bypass valve operation and vacuum/electrical actuation

Answer

P0234 most commonly results from a stuck-closed or slow-responding bypass valve; verifying its actuation before replacement avoids unnecessary parts cost.

Question 4

When performing an adaptation reset on an Audi DSG (DL501) 7-speed transmission using ODIS, what must the technician do AFTER the reset procedure?

Accepted Answer

Complete the basic settings drive cycle including low-speed clutch engagement cycles

Answer

After a DSG adaptation reset, a specific low-speed clutch engagement drive cycle must be completed so the TCM can relearn clutch fill pressures and engagement points.

Question 5

On an Audi equipped with an EA888 Gen 3 engine, what is the primary function of the Active Cylinder Management (ACT) system at light loads?

Accepted Answer

Deactivate cylinders 2 and 3 to reduce pumping losses and fuel consumption

Answer

ACT deactivates cylinders 2 and 3 by holding their valves closed at light loads, reducing throttling losses and improving fuel economy.

(ADT) Audi Diagnostic Technician Practice Test

(ADT) Audi Diagnostic Technician Practice Test

ADT Powertrain & Engine Management Systems 2