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LESSON 3: POWERTRAIN
Transmission Electronic System
The TCM receives input signals from certain transmission-related sensors and switches. The TCM uses these
signals to control the following operations:
•
Shift timing
•
Line pressure (shift feel)
•
Torque converter clutch
To accomplish this, the TCM uses six pressure control solenoids and one shift solenoid to control transmission
operation. Five pressure regulators and one solenoid valve are used to control direct transmission fluid flow to
select internal clutches and control the fluid pressure at the clutch. A separate pressure regulator is used
exclusively for torque converter clutch control.
The following provides a brief description of each of the sensors and actuators used to control transmission
operation.
2005 Expedition/Navigator New Model Technician Training 02-SEP-04 3-53