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Solenoid Valve

Disconnect vacuum hose from solenoid valve port "A". Blow through port "B". See Fig 1 . Verify air flows from valve air filter. Disconnect solenoid valve connector. Connect 12 volts and a ground to solenoid valve terminals. Blow through valve port "B" and ensure air flows from port "A". Replace solenoid valve if it does not perform as indicated.

Fig 1: Testing VDI Actuator

Courtesy of MAZDA MOTORS CORP.