DTC Control Unit (Ram), Control Unit (ROM): Description: Notes
WARNING: This page is about a different car, the 2002 Nissan Sentra. 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 and output and for power supply. The unit controls the A/T.
Fig 1: Identifying Transmission Control Module Unit