Variable Tumble Control System (VTCS) Solenoid Check
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.
Remove VTCS solenoid. Check solenoid airflow. Air should flow through ports "B" and "C". See Fig 1. Apply battery voltage to solenoid. Check airflow. Air should flow through ports "A" and "B". If air flow is not as specified, replace VTCS solenoid. If solenoid is okay, check vacuum lines. Repair as necessary. If problem is not present, Check for open or short circuit. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. Repair or replace wiring harness as necessary.