Variable Tumble Control System Solenoid - MAZDA6 (2.3L)
WARNING: This page is about a different car, the 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, 2003 Mazda MPV, and 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
See VARIABLE TUMBLE CONTROL SYSTEM - MAZDA6 (2.3L) under AIR INDUCTION SYSTEMS.