Checking Conditions

WARNING: This page is about a different car, the 1996 Volkswagen Passat. However, it is still accessible from the selected car via links, so may be relevant.

No malfunctions stored in Diagnostic Trouble Code (DTC) memory. See TESTS W/CODES - 1.9L DIESEL article.
Perform Output Diagnostic Test Mode. See TESTS W/CODES - 1.9L DIESEL article.
No leaks from intake and exhaust systems
Wastegate control line is not blocked, loose or leaking
No engine or fuel injection mechanical malfunctions such as start of injection, fuel injectors and compression pressure
Engine oil temperature 80° C minimum