LOCK-UP CONTROL: System Description: Notes
- The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to increase power transmission efficiency.
- Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
- The torque converter clutch control valve operation is controlled by the torque converter clutch solenoid valve, which is controlled by a signal from TCM, and the torque converter clutch control valve engages or releases the torque converter clutch piston.
LOCK-UP OPERATION CONDITION
| Selector lever | "D" position | "M" position | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gear position | 7 | 6 | 5 | 4 | 3 | 2 | 7 | 6 | 5 | 4 | 3 | 2 |
| Lock-up | x | - | - | - | - | - | x | x | x | x | x | x |
| Slip lock-up | x | x | x | x | x | x | x | x | x | x | x | x |
Lock-up released
- In the lock-up released state, the torque converter clutch control valve is set into the unlocked state by the torque converter clutch solenoid and the lock-up apply pressure is drained.
in this way, the torque converter clutch piston is not coupled.
Lock-up Applied
- In the lock-up applied state, the torque converter clutch control valve is set into the locked state by the torque converter clutch solenoid and lock-up apply pressure is generated.
In this way, the torque converter clutch piston is pressed and coupled.