Closed Throttle Position Switch (Millenia 2.3L)
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Mazda Tribute, 2002 Mazda Protege5, 2002 Mazda Protege, 2002 Mazda Millenia, and 2002 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
The Closed Throttle Position (CTP) switch, detects fully closed throttle plate position and sends a signal to the PCM. On Millenia 2.3L, the CTP switch is part of the TP sensor, which is adjusted automatically when the TP sensor is adjusted.