Lock-Up Mechanism

The lock-up causes the input shaft (mainshaft) to rotate at the same speed as the engine crankshaft by engaging the torque converter cover with the turbine by the torque converter clutch. Together with the hydraulic control, the PCM optimizes the timing and degree of lock-up. The lock-up mechanism operates in D (during accelerating: 1st, 2nd, 3rd, 4th, 5th, and 6th gears/during decelerating: 2nd, 3rd, 4th, 5th, and 6th gears), and in L (during accelerating: 1st and 2nd gears/during decelerating: 2nd gear). The torque converter clutch is in the torque converter. The multi-plate torque converter clutch increases the torque capacity and increases the lock-up clutch surface area, improving fuel economy and durability.