Variable Tumble Control System (VTCS) Solenoid Check

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.

Fig 1: Testing VTCS Solenoid Operation

Courtesy of MAZDA MOTORS CORP.