Second Range With TCC Applied (Tow-Haul)

Energizing the torque converter clutch pulse width modulated (TCC PWM) solenoid moves the valve downward against the stop, allowing main pressure to flow to the top of the converter flow valve. The converter flow valve is moved downward, exhausting converter-in pressure to sump, and eliminating the separating force between the TCC piston and the converter cover. At the same time, the converter flow valve opens the passage supplying TCC-apply pressure to the converter-out circuit. The pressure differential across the TCC piston applies the torque converter clutch.

Depending upon the calibration, TCC PWM solenoid could be energized in ranges 2-5. The calibrations can also apply the TCC for special applications such as power take-off (PTO) operation controlled directly by engine speed with transmission in Neutral (N) or TCC operation in first hold.