A/T Control System: TCM

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

The TCM consists of a microcomputer and connectors for signal input/output and for power supply.

Courtesy of NISSAN NORTH AMERICA, INC.
TCM judges the driving conditions of the vehicle according to signals from each sensor, each switch, and other ECUs and optimally controls the transmission.