Evaporative Emission System: Notes
WARNING: This page is about a different car, the 2024 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
The evaporative emission system has been designed to minimize the release of hydrocarbons from the fuel system into the atmosphere. The evaporative emission system components all work together with the ECM to prevent fuel vapor from escaping and route it to the intake manifold to be burned during normal combustion.
The leak detection system checks the integrity of the evaporative emission system by pressurizing the system.
- There are 3 different types of evaporative emission systems used. These systems are explained below.
- LEAK DETECTION PUMP (LDP) EVAP SYSTEM
- TANK LEAK DIAGNOSTIC MODULE (DM - TL) EVAP SYSTEM
- NATURAL VACUUM LEAK DETECTION (NVLD) EVAP SYSTEM
- EVAP SYSTEM, CHECKING FOR LEAKS