DTC 23: Operation Signal To Fuel Gauge
WARNING: This page is about a different car, the 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
Wait for 2 seconds after selecting DTC 23. If LCD indicates 00, ensure fuel gauge moves from "F" to "1/2" to "E", resting on "F" in 2 second intervals. If fuel gauge movement is correct, fuel gauge is okay. If fuel gauge movement is not as described, replace instrument cluster. If LCD indication is 99, replace instrument cluster.