AUDI Performance Optimization 2

Question 1

What does Audi's 'Cylinder on Demand' (COD) system do during light-load highway cruising?

Accepted Answer

Shuts down half the cylinders to reduce fuel consumption

Answer

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?

Accepted Answer

Diverter valve for leakage

Answer

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?

Accepted Answer

Sport Differential (rear axle)

Answer

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?

Accepted Answer

Cool compressed intake air to increase density and power

Answer

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?

Accepted Answer

Intake manifold runner position sensor fault

Answer

P2015 relates to the intake manifold runner position sensor/switch circuit, which can disrupt airflow and throttle response.

(AUDI) Audi Certified Mechanic Practice Test