Lock-Up System: Notes

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 pressurized fluid is supplied through a lock-up fluid passage in the torque converter, causing the torque converter clutch in the torque converter to be engaged. As this takes place, the mainshaft rotates at the same speed as the engine crankshaft. The PCM controls the shift solenoid valve C pressure and A/T clutch pressure control solenoid valve D pressure to optimize the lock-up timing and the amount of the lock-up. The shift solenoid C pressure operates the lock-up shift valve to switch the lock-up ON and OFF. The A/T clutch pressure control solenoid valve D pressure operates the lock-up control valve to control the degree of lock-up.