Transaxle Control Switch
WARNING: This page is about a different car, the 2002 Mazda 626 and 2001 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
Transaxle Control Switch (TCS) is mounted on gearshift lever handle. Switch controls operation of 4th gear. Malfunction of switch will cause lack of 4th gear disable function.