CLK 430 (208.370) V8-4.3L (113.943) (1999)
Control Module: Description and Operation
Hydraulic control unit, function
Operation
Pressure supply to solenoid valves The oil (Pentosin) supplied by the hydraulic pump is delivered to the valve block (2) through a steel line. The oil
passes through a pressure oil filter (2c) and via a check valve direct to the automated manual transmission clutch solenoid valve (Y90), the automated
manual transmission control solenoid valve for gears 1, 3, 5 (Y92/1), the automated manual transmission control solenoid valve for gears R, 2, 4, 6
(Y92/2) and the automated manual transmission brake solenoid valve (Y91).
Clutch actuation
The automated manual transmission clutch solenoid valve (Y90) is energized by the automated manual transmission control module (N15/ 6). This
initiates a flow of hydraulic oil, which flows through a pressure line attached to the connection (2d) and into the hydraulic central clutch operator to
actuate the clutch.
Gearshift actuation
Depending on the gearshift required, the automated manual transmission control module (N15/6) actuates either the automated manual transmission
control solenoid valve for gears 1, 3, 5 (Y92/1) or the automated manual transmission control solenoid valve for gears R, 2, 4, 6 (Y92/2). The solenoid
valve responsible for the appropriate gear directs the hydraulic pressure into the shift cylinder, which actuates the central shift shaft and engages the
required gear via the connecting elements in the transmission.