ML 430 (163.172) V8-4.3L (113.942) (2000)
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Shift Solenoid: Description and Operation
Models With Touch Shift
Upshift/Downshift Solenoid Valve
Position/Task/Design/Function
Component Illustration
Position
In the shell of the electric control unit and pressed against the shift plate with a spring.
Task
The solenoid valves (Y3/6y3, Y3/6y4, Y3/6y5) initiate the upshift and downshift procedures in the shift plate.
Design
The solenoid valves (Y3/6y3, Y3/6y4, Y3/6y5) are sealed off from the valve housing of the shift plate (2a) by two O-rings (34, 35). The contact
springs (32) at the solenoid valve engage in a slot in the conductor tracks (33). The force of the contact spring (32) ensures safe contacts.
Function
If a solenoid valve is actuated by the ETC control module (N15/3), it opens and guides the control pressure (p-SV) to the assigned command valve
(31). The solenoid valve remains actuated and therefore open until the shifting process is complete. The shift pressure (p-SV) to the command valve is
reduced to zero as soon as the power supply to the solenoid valve is interrupted.
Related Information
Shift Pressure Control Solenoid Valve
Position/Task/Design/Function
