XK-8 Coupe (X100) V8-4.0L (AJ26) (1998)
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Torque Converter Clutch Solenoid: Description and Operation
Clutch Hydraulic Pressure Regulation
The TCM supplies an internally switched +12 Volt supply to the #4 pressure regulator. The regulator is operated by switching the other side of the
operating winding to ground. Hydraulic pressure is controlled by 'Pulse Width Modulation' (PWM) of the ground switching signal i.e. the duty cycle;
the time that the pressure regulator is switched on.