AUDI Performance Optimization 2 — Questions and Answers
Question 1: What does Audi's 'Cylinder on Demand' (COD) system do during light-load highway cruising?
- Shuts down half the cylinders to reduce fuel consumption (Correct answer)
- Increases turbo boost to maintain power
- Switches to electric-only mode
- Activates all cylinders for maximum torque
Correct answer: Shuts down half the cylinders to reduce fuel consumption
COD deactivates 2 of 4 cylinders under light load to improve fuel economy while maintaining smooth operation.
Question 2: An Audi S4 with a 3.0T engine exhibits boost pressure that is 2 psi below target at full throttle. Which component should be checked first?
- Diverter valve for leakage (Correct answer)
- Spark plugs for wear
- Mass airflow sensor calibration
- Throttle body actuator
Correct answer: Diverter valve for leakage
A leaking or stuck-open diverter valve bleeds off boost pressure, causing below-target boost at full throttle.
Question 3: Which Audi performance feature uses rear torque vectoring to improve cornering agility?
- Sport Differential (rear axle) (Correct answer)
- Quattro Ultra AWD
- Electronic Stabilization Control (ESC)
- Adaptive air suspension
Correct answer: Sport Differential (rear axle)
Audi's Sport Differential actively distributes torque between rear wheels to enhance cornering without understeer.
Question 4: What is the primary purpose of the intercooler on a turbocharged Audi engine?
- Cool compressed intake air to increase density and power (Correct answer)
- Reduce exhaust gas temperature
- Cool engine oil during spirited driving
- Reduce coolant temperature under boost
Correct answer: Cool compressed intake air to increase density and power
Intercoolers lower the temperature of compressed air from the turbo, increasing air density and allowing more fuel for greater power.
Question 5: A technician is diagnosing an Audi RS5 with sluggish throttle response. Fault code P2015 is present. What does this indicate?
- Intake manifold runner position sensor fault (Correct answer)
- Throttle body actuator failure
- Turbocharger bypass valve stuck open
- Exhaust gas recirculation valve malfunction
Correct answer: Intake manifold runner position sensor fault
P2015 relates to the intake manifold runner position sensor/switch circuit, which can disrupt airflow and throttle response.
Question 6: When performing a compression test on an Audi 2.0T TFSI engine, a difference of more than how many psi between cylinders indicates a potential problem?
- 15 psi (Correct answer)
- 5 psi
- 30 psi
- 50 psi
Correct answer: 15 psi
A cylinder-to-cylinder compression variance greater than 15 psi typically indicates worn rings, valves, or head gasket issues.
Question 7: Which Audi technology adjusts exhaust valve timing independently of intake to optimize scavenging at high rpm?
- Audi Valvelift System (AVS) on exhaust side (Correct answer)
- Turbo variable geometry vanes
- Electronic wastegate control
- Active exhaust flap system
Correct answer: Audi Valvelift System (AVS) on exhaust side
AVS on the exhaust camshaft adjusts valve lift to optimize exhaust scavenging and high-rpm breathing efficiency.
AUDI Performance Optimization 2
What does Audi's 'Cylinder on Demand' (COD) system do during light-load highway cruising?