•  The TCM and its input/output network control the following transmission operations:

•  The transmission control strategy combined with the engine control provides optimum powertrain operation under all conditions.

•  When determining the best operating strategy for transmission operation, the TCM uses input information from the PCM via the CAN bus. 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 PCM uses 3 pressure controls, 1 torque converter clutch and 4 shift solenoids to control transmission operation.