DTC P2004: Variable Tumble Control System (VTCS) Shutter Valve Stuck Open: Notes

WARNING: This page is about a different car, the 2004 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: DTC P2004 - Detection Conditions & Possible Causes

Courtesy of MAZDA MOTORS CORP.