Lock up
The torque converter clutch is activated at a steady speed when there is no need of torque amplification. If the brakes are applied or acceleration increases, the function will be deactivated.
To protect the gearbox there are temperature programs to prevent overheating. TCM can choose to raise the shift points and activate lock up more often if the oil temperature is too high.
Reverse gear will not be activated if the car is travelling faster than 7 km/h. If the power supply to the solenoids fails, it is still possible to drive the car. Gear position D/M gives 2nd gear and P-R-N will work as usual. In case of a major fault in the gearbox, mechanical or electrical, TCM will cut the supply to the solenoids in a controlled manner (limp home).
Special gear change programs for special driving conditions. If an uphill gradient is detected, the gears will change at higher engine speeds and each gear will remain engaged for longer periods.