TCM Self-diagnosis Does Not Activate: Description

WARNING: This page is about a different car, the 2004 Nissan Quest. 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 Park/Neutral Position Switch
Courtesy of NISSAN MOTOR CO., U.S.A.
Overdrive control switch
Detects the overdrive control switch position (ON or OFF) and sends the signal via CAN communication to the TCM from combination meter.

Fig 2: Identifying Overdrive Control Switch
Courtesy of NISSAN MOTOR CO., U.S.A.
Closed throttle position signal and wide-open throttle position signal
ECM judges throttle opening based on a signal from accelerator pedal position (APP) sensor, and sends the signal via CAN communication to TCM

Fig 3: Identifying Accelerator Pedal Position Sensor
Courtesy of NISSAN MOTOR CO., U.S.A.