Range Rover (LM) V8-4398cc 4.4L (M62) (2003)
Torque Converter Clutch: Description and Operation
Torque Converter Clutch
Description
An electronic pressure regulating solenoid, which is controlled by the TCM, hydraulically controls the Torque Converter Clutch (TCC). This allows the
torque converter to have three states of operation as follows:
-
Fully engaged
-
Controlled slip variable engagement
-
Fully disengaged.
Two hydraulic spool valves located in the valve block control the TCC. These valves are actuated by pilot pressure supplied via a solenoid valve, which
is also located in the valve block. The solenoid valve is operated by Pulse Width Modulation (PWM) signals from the TCM to give full, partial or no
lock-up of the TCC.
There is a function check of the TCC solenoid, an error is detected if:-
1. The enabling conditions are satisfied and the engine speed minus the input shaft speed is greater than 80 rpm.