Review on Motorcraft CX1549 Vapor Canister Solenoid by Roy Boone

testing these valves you usually have vacuum inlet and outlet. The computer sends a signal to the valve to open by electricity. As soon as the currant is applied, the valve opens. back and use the vacuum switch to open the valve. That's why it has a third vacuum line, a small one that comes out from the bottom. to test the power supply of the device. At this point the valve is in the closed position. Pull a slight vacuum on the small exhaust valve, it opens. if he is a worker.