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Home >> Infiniti >> 2009 >> QX56 AWD >> Repair and Diagnosis >> Transmission >> Automatic Transmission >> Function Diagnosis >> A/T Control System >> Lock-up Control >> Notes
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Lock-up Control: Notes

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 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 Table

LOCK-UP OPERATION CONDITION CHART

Select lever D position 4 position 3 position 2 position
Gear position 5 4 4 3 2
Lock-up x - x x x
Slip lock-up x x - - -