ADT Transmission & Drivetrain Systems 2 — Questions and Answers
Question 1: On an Audi with DSG (Direct Shift Gearbox), what fluid specification is required for the dual-clutch wet pack?
- ATF Dexron VI
- G 052 182 A2 (DSG fluid) (Correct answer)
- Pentosin CHF 11S
- VW 501.01 engine oil
Correct answer: G 052 182 A2 (DSG fluid)
Audi DSG wet-clutch units require G 052 182 A2 fluid, which is specifically formulated for the dual-clutch friction characteristics.
Question 2: What is the primary function of the Torsen differential used in Audi quattro systems?
- Electronically locks the center differential on demand
- Passively distributes torque based on traction via worm gears (Correct answer)
- Actively brakes individual wheels to simulate locking
- Disconnects the rear axle at highway speeds to save fuel
Correct answer: Passively distributes torque based on traction via worm gears
The Torsen (torque-sensing) differential uses worm gears to automatically and passively bias torque to the axle with more traction without electronic intervention.
Question 3: A customer complains of a shudder during low-speed acceleration on an Audi with a wet-clutch DSG. After topping off the correct fluid, the shudder persists. What is the most likely cause?
- Worn wheel bearings
- Contaminated or degraded DSG fluid requiring a full change (Correct answer)
- Faulty ABS wheel speed sensor
- Worn CV joint boots
Correct answer: Contaminated or degraded DSG fluid requiring a full change
Clutch shudder in wet DSG units is commonly caused by degraded friction modifiers in old fluid; a complete fluid change with the correct G 052 182 A2 fluid typically resolves the issue.
Question 4: When performing a ZF 8-speed automatic transmission adaptation reset on an Audi using ODIS, which sequence is correct?
- Clear DTCs, road test, then run Basic Settings (Correct answer)
- Run Basic Settings, clear DTCs, then road test
- Replace the mechatronic unit, then run Basic Settings
- Run Basic Settings only after replacing the transmission fluid
Correct answer: Clear DTCs, road test, then run Basic Settings
DTCs must be cleared first so the adaptation learns from a clean baseline during the subsequent road test before Basic Settings confirms the adaptation.
Question 5: On an Audi quattro with crown gear center differential, what is the default front-to-rear torque split under normal driving conditions?
- 50:50
- 40:60 (Correct answer)
- 60:40
- 30:70
Correct answer: 40:60
The crown gear center differential in sport quattro models provides a 40:60 front-to-rear torque split by default for a rear-biased driving feel.
Question 6: An Audi with Tiptronic exhibits harsh downshifts only in manual mode. In automatic mode, shifting is smooth. What is the most likely cause?
- Worn torque converter clutch
- Faulty paddle shift switch sending incorrect gear commands (Correct answer)
- Low transmission fluid level
- Defective transmission range sensor
Correct answer: Faulty paddle shift switch sending incorrect gear commands
A faulty paddle shift or selector switch can send erroneous gear commands, causing harsh or inappropriate downshifts that only manifest during manual gear selection.
Question 7: Which ODIS function is used to calibrate the clutch bite point on a new or replacement DSG mechatronic unit?
- Output Tests
- Basic Settings — Clutch Teaching (Correct answer)
- Adaptation — Long Adaptation Reset
- Guided Fault Finding — Clutch Module
Correct answer: Basic Settings — Clutch Teaching
The 'Basic Settings — Clutch Teaching' function in ODIS calibrates the bite point for each clutch pack after a mechatronic replacement or full fluid service.
ADT Transmission & Drivetrain Systems 2
On an Audi with DSG (Direct Shift Gearbox), what fluid specification is required for the dual-clutch wet pack?