Good morning,
Battery voltage is supplied to the vent solenoid with the key on. The ground side is grounded by the ECM when the evap test is initiated.
https://www.2carpros.com/articles/how-to-check-wiring
When the ECM grounds it, the solenoid closes and will not vent air from the tank.
https://www.2carpros.com/articles/evap-system-code-repair
You need a scan tool that can turn the solenoid on and off. That is the way to check it. Checking the ohms is not a test at all. You need voltage checks looking for commands.
I attached some information for you to view. This valves sticks in the open position not allowing the evap system to complete its testing. Very common failure.
Again, you will need a scan tool for testing this valve.
Roy
Images (Click to make bigger)
Sunday, September 19th, 2021 AT 6:53 AM