Evaporative Emission System (EVAP) Valve (%)

The value indicates the actual control signal to the directly connected EVAP valve. The control module opens the valve when the conditions to be able to drain the canister of hydrocarbons are met.

Measurement range 0-100%.

0% = closed valve.

100% = fully open valve.

The valve is normally closed immediately after the engine has started. It is closed while waiting for fuel trim to start, which requires the engine to be hot among other things. If fuel trim does not need to adjust the fuel amount, the valve opens, on the condition that the pressure on the intake manifold is less than the atmospheric pressure, which is the pressure in the fuel tank and canister.