Preconditions for the test:
Engine idling.
No faults stored.
Engine temperature above 80 °C.
All electrical loads switched off.
Gear selector set to P/N.
Induction air temperature below 60 °C.
Note:
To check the tank venting system.
Procedure:
Choose the tank ventilation system.
The tank ventilation system changes from ”Test off” to ”Test on”.
Let the engine idle until the tank ventilation system changes to ”TVV OK / TVV nOK”.
Required values at test: Tank valve opening angle 13-25 % (varies about 6 % in test), tank valve self-test >25 %, induction manifold pressure 240-420 mbar.