Torque Converter Lock-Up Solenoid (On/Off MV Controlled)

Torque Converter Lock-up Solenoid (On/Off MV Controlled)





4HP 24: The torque converter lockup solenoid (MV 3) controls the engagement of the lockup clutch in the torque converter. The WK solenoid is normally sprung to the vent position and energized to allow pressure flow to activate the lock up piston. When activated it allows pressurized hydraulic oil to flow through the valve for lockup engagement.

Lockup is possible in D3 and D4 in the E-mode, and D3 in the S-mode. Lockup is engaged when the TCM applies a switched ground to activate the solenoid.

A4S 310/270R: The torque converter lock-up solenoid (WK) controls the engagement of the lock-up piston in the torque converter. With the lock-up piston engaged, the torque converter acts as a solid unit, and provides a direct link between the engine and transmission. The WK solenoid is sprung closed and powered open to control pressurized hydraulic oil flow for lock-up clutch engagement.

A5S 310Z: The MV 6 solenoid valve controls the torque converter lock-up clutch (WK). The solenoid valve is normally open (failsafe). Power to the MV 6 solenoid valve is supplied by the EGS control module. The valve is activated by the TCM by switching the circuit to ground. Torque converter lock-up is possible in 4th or 5th gear.

The torque converter unlocks while coasting (LL). The ECM also receives the WK signal for activation of a modified ignition/injection map.