Self Diagnosis Function: Notes
WARNING: This page is about a different car, the 2005 Mercury Montego and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
The transmission control module (TCM) monitors the communication status of each sensor, electronic component and the powertrain control module (PCM). If any malfunction should occur, the TCM function warns the driver and stores the malfunction as a diagnosis code.