EVAP System Function Test
WARNING: This page is about a different car, the 2023 Audi S3, 2023 Audi RS 3, 2023 Audi A3 Quattro, and 2023 Audi A3. However, it is still accessible from the selected car via links, so may be relevant.
Vehicles with High-Voltage System
- In electric driving mode the Tank Switch-Off Valve -N288- -item 4- closes the breather line -6- to the EVAP canister -2-, so that it is not overfilled with fuel vapor, for example, when driving electrically for days on end.
- Because the pressure in the fuel tank -3- increases due to temperature effects when the breather line is closed, the Fuel Tank Pressure Sensor -G1169- -item 5- monitors the pressure inside the tank and causes the Tank Switch-Off Valve -N288- to open via the engine control module at a gauge pressure of 0.3 bar. Additionally the valve opens when the fuel filler door release button is pressed, so that no fuel can squirt out of the filler neck when opening the cap to fuel.
1 -
EVAP Canister Purge Regulator Valve 1 -N80- to the engine