DTC 25: Operation Signal To Temperature Gauge
WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
Wait for 2 seconds after selecting DTC 25. If temperature gauge cycles from "H" to center to "C", resting on "H" in 2 second intervals, water temperature gauge is okay. If water temperature gauge does not cycle as described, replace instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION.