ML 430 (163.172) V8-4.3L (113.942) (2000)
Component Illustration
Location
In the valve housing of the electrohydraulic control module.
Task
Regulates the shift valve pressure (p-SV).
Function
The non-constant regulating valve pressure (p-RV) is regulated to a constant shift valve pressure (p-SV) at the shift valve pressure regulating valve
(21) and used to supply the 1-2 and 4-5 / 3-4 / 2-3 solenoid valves (Y3/6y3, Y3/6y4, Y316y5) and the torque converter lockup clutch PWM solenoid
valve (Y3/6y6).
Related Information
Holding Pressure Shift Valve
Location/Task/Function
Component Illustration
Location
Each shift group possesses one holding pressure shift valve. The 1-2 / 4-5 and 2-3 holding pressure shift valves are installed in the shift valve housing;
the 3-4 holding pressure shift valve is installed in the valve housing.
Task
Allocates the working pressure to one actuator of a shift group.
Function
The holding pressure shift valve is actuated by the pressures present at the end face in the actuators and a spring. It assigns the working pressure to the
actuator with the higher pressure (taking into account the spring force and the effective surface area). The other element of the shift group is then
unpressurized. The valve switches over only during the shift phase and only at a certain pressure ratio between the overlap pressure (p-U) and the shift
pressure (p-S).