A/T CONTROL SYSTEM
AT-425
[RE5F22A]
D
E
F
G
H
I
J
K
L
M
A
B
AT
Revision: November 2006
2006 Altima
Lock-Up Control
ECS009CP
The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to
increase power transmission efficiency.
The torque converter clutch control valve operation is controlled by the pressure control solenoid valve C,
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 Table
TORQUE CONVERTER CLUTCH CONTROL VALVE CONTROL
Lock-up Control System Diagram
Lock-up Released
●
In the lock-up released state, the torque converter clutch control valve is set into the unlocked state by the
pressure control solenoid valve C 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
pressure control solenoid valve C and lock-up apply pressure is generated.
In this way, the torque converter clutch piston is pressed and coupled.
Selector lever
D position
M5 position
M4 position
M3 position
Gear position
5
4
5
4
3
Lock-up
×
–
×
×
×
Slip lock-up
×
×
–
–
–
SCIA2612E
