Throttle Position Sensor
WARNING: This page is about a different car, the 2002 Nissan Sentra, 2002 Infiniti G20, 2001 Nissan Sentra, and 2001 Infiniti G20. However, it is still accessible from the selected car via links, so may be relevant.
Throttle Position (TP) sensor is a potentiometer mounted to engine throttle body. ECM receives signal from TP sensor relaying throttle plate position. TP sensor failure will cause TCM to enter fail-safe mode and raise line pressure to prevent transaxle damage.