Lock-Up Condition

The EAT ECU operates the lock-up solenoid, which in turn supplies pilot pressure to the control valve. See Fig 1 . The control valve moves under the influence of the pilot pressure, blocking the release pressure feed to the lock-up clutch and re- directing it to the other side of the clutch mechanism.

With the release pressure removed, the lock-up clutch moves and engages with the torque converter, moving the lock- up mechanism into the locked condition.

Fig 1: Torque Converter Lock-Up Condition

Courtesy of LAND ROVER NORTH AMERICA, INC.