Theory Of Operation
WARNING: This page is about a different car, the 2013 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.
The purpose of the monitoring is to detect circuit failures of the Output Speed Sensor (OSS). This monitoring is done by an ASIC which communicates with the main microprocessor via a Serial Port Interface (SPI) BUS. The ASIC is integrated in the Transmission Control Module (TCM).