Ford FCSD TECHNICAL TRAINING FCS-14000-DL Manuel d'utilisateur télécharger pdf (Page 96)

LESSON 3: POWERTRAIN

TCM Monitoring Functions

The TCM monitors all transmission inputs and outputs to identify possible transmission failures. If a fault is

detected, the TCM takes the appropriate actions to ensure the transmission enters a safe mode of operations. The

PCM then sets a DTC and illuminates the Malfunction Indicator Lamp (MIL).

•

Voltage Supply - This function monitors the vehicle’s battery life.

•

Watchdog Monitoring - This feature has two functions:

– Checks for faults in the driver circuits by activating each driver.

– Checks to see if the safety circuit is functioning correctly.

•

TCM Temperature - If the TCM temperature raises above a predetermined level, the TCM shuts down. Prior

to shutting down, the TCM logs a fault code during the shut down. The transmission enters a mechanical limp

home mode.

•

Pressure Regulator/Solenoid - Each pressure regulator and solenoid is monitored for open and short circuits.

The TCM also checks that the current being delivered to each solenoid valve or pressure regulator is within

limits.

•

Torque Converter Control - The TCM checks and verifies that the torque converter has been engaged

correctly. If the torque converter has not engaged correctly, the TCM will carry out the fail-safe action of

opening the converter clutch.

2005 Expedition/Navigator New Model Technician Training02-SEP-043-60

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Ford FCSD TECHNICAL TRAINING FCS-14000-DL Manuel d'utilisateur Page 96