Charge Air Cooler By-Pass (System Check)
WARNING: This page is about a different car, the 1997 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.
Start engine and verify charge air cooler by-pass actuator rod is retracted. See Figure . 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, by-pass solenoid valve, faulty shutter valve or faulty actuator.