Assessment and Evaluation Flashcards

A DSG transmission shows harsh engagement from a stop. What should be evaluated first?

Answer: Check the DSG fluid level and condition and look for software updates or TSBs

Fluid condition, software level, and known TSBs are common, low-cost causes to rule out before replacing major parts.

What does a TSB (Technical Service Bulletin) provide during diagnosis?

Answer: Manufacturer guidance on known issues and their approved repairs

TSBs document known problems and the repair procedures VW recommends for them.

A coolant pressure test holds at first and then slowly loses pressure with no visible external leak. What should be suspected next?

Answer: An internal leak such as a head gasket or EGR cooler

Pressure loss with no external leak points to an internal leak, such as into the combustion chamber or an EGR cooler.

A combustion gas (block) tester turns the test fluid from blue to yellow. What does this indicate?

Answer: Combustion gases (CO2) in the cooling system

The color change shows exhaust gases in the coolant, which usually means a head gasket or cylinder head failure.

When evaluating a CAN bus communication fault, what resistance between CAN-High and CAN-Low with the battery disconnected suggests a healthy network?

Answer: About 60 ohms

The two 120-ohm termination resistors in parallel measure about 60 ohms on a healthy high-speed CAN bus.

Why is documenting the 3 Cs (Concern, Cause, Correction) on a repair order important?

Answer: It supports warranty claims and gives a clear repair history

Clear 3C documentation is required for warranty approval and records exactly what was found and fixed.

A parasitic draw test on a VW shows 250 mA after the modules have gone to sleep. How should this be evaluated?

Answer: Excessive, since most VWs should settle well under 50 mA

Once the modules sleep, the draw should typically drop below about 50 mA, so 250 mA will drain the battery.