Charge Air Cooler Bypass (System Check)
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.
Start engine and verify actuator rod is retracted. Increase engine speed to 4100 RPM. Actuator rod should extend. If actuator rod does not operate as described, check for leaking vacuum hose, faulty vacuum pump, charge air cooler bypass solenoid valve faulty shutter valve sticking or faulty actuator.