Transmission Electronic System: Notes

The transmission control module (TCM) and its input/output network control the following transmission operations:

• Shift timing.
• Line pressure (shift feel).
• Torque converter clutch.

In addition, the TCM receives input signals from certain transmission-related sensors and switches. The TCM also uses these signals when determining transmission operating strategy.

Using all of these input signals, the TCM can determine when the time and conditions are right for a shift, or when to apply or release the torque converter clutch. It will also determine the pressure needed to optimize shift feel. To accomplish this the TCM uses six pressure control solenoids and one shift solenoid to control transmission operation.

The following provides a brief description of each of the sensors and actuators used to control transmission operation.