Control of shift operations with ESSC

In the 4F27E automatic transmission electronic synchronous shift control (ESSC) is used.

ESSC monitors the shift operations and is able to adapt to the wear in the shift elements over the life of the transmission.

This is possible since the shift elements are actuated by modulating valves.

The system monitors the shift time whether the shift operation is synchronous.

If the PCM detects a deviation from the stored values for the shift time and synchronization of the shift operation, the pressure build up or reduction is adapted accordingly.