Charge Air Cooler Bypass Actuator
WARNING: This page is about a different car, the 1995 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.
Remove vacuum hose from actuator. Connect vacuum pump to actuator and apply 7.4 in. Hg (25 kPa). Actuator rod should retract. If actuator does not operate, replace actuator.