Input/Turbine Speed Sensor
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.
Disconnect input/turbine speed sensor connector. Using a DVOM, measure resistance between both input/turbine speed sensor terminals. Resistance should be 253-604 ohms. See Fig 1. If resistance is not within specification, replace sensor. If resistance is within specification, sensor is okay.