21. TCM Self-diagnosis Does Not Activate {Park/neutral Position (PNP), Overdrive Control and Throttle Position Sensor [Accelerator Pedal Position (APP) Sensor] Switches Circuit Checks}: Description

WARNING: This page is about a different car, the 2004 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

Park/neutral position (PNP) switch
The park/neutral (PNP) switch assembly includes a transmission range switch. The transmission range switch detects the selector lever position and sends a signal to the TCM.

Fig 1: Identifying PNP Switch
Courtesy of NISSAN MOTOR CO., U.S.A.
Overdrive control switch
Detects the overdrive control switch position (ON or OFF) and sends a signal to the TCM.

Fig 2: Identifying Overdrive Control Switch
Courtesy of NISSAN MOTOR CO., U.S.A.
Throttle position sensor [accelerator pedal position (APP) sensor]
The throttle position sensor [accelerator pedal position (APP) sensor] is part of the system that controls the throttle position. This system also uses an electric throttle control actuator, which consists of a throttle control motor and throttle position sensors. Accelerator pedal position signal is sent to the ECM.

Fig 3: Identifying Throttle Position Sensor [Accelerator Pedal Position (APP) Sensor]
Courtesy of NISSAN MOTOR CO., U.S.A.