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LESSON 3: POWERTRAIN
Transmission Control Module (TCM)
Transmission Control Module (TCM)
The TCM is mounted on top of the main control valve body. The control module has been designed to operate
correctly in the environment in which the TCM is located.
The TCM is activated and deactivated by the ignition supply and is connected to the transmission link harness by
a 16-pin connector.
The TCM monitors all TCM inputs and outputs to confirm correct system operation. If a fault occurs, the TCM is
able to carry out default action. It informs the driver of the problem through the instrument cluster message
center.
The TCM is programmable. The WDS can be used to flash selected program strategies within the TCM.
2005 Expedition/Navigator New Model Technician Training02-SEP-043-54