EVAP System Function Test
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2017 Audi S3, 2017 Audi RS 3, 2017 Audi A3 Quattro, 2016 Audi S3, and 2016 Audi A3 Quattro. 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- -4- closes the breather line -6- to the EVAP canister -2-, so that for example on a drive for days it is not overfilled with fuel vapor.
- Because the pressure in the fuel tank -3- increases due to temperature effects when the breather line is closed, the Fuel Tank Pressure Sensor -G400- -5- monitors the tank-internal pressure and via the engine control module causes the Solenoid Valve 1 -N288- to open at a residual pressure of 0.3 bar (4.3 psi). 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