EVAP Leak Detection System
WARNING: This page is about a different car, the 2002 Audi S4. However, it is still accessible from the selected car via links, so may be relevant.
EVAP system is equipped with leak detection diagnosis capabilities. Leak Detection Pump (LDP) pressurizes system and should detect leaks in entire system, including fuel tank, EVAP canister, EVAP valve and EVAP canister purge solenoid valve.
To test tank ventilation system, see tank ventilation system related DTC(s) under DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.