Electric control unit component description - GF27.19-P-5145GZ

TRANSMISSION 722.9 in MODEL 164.1/8, 216, 221, 251.0/1 up to Model Year 8

Fig 1: Locating Electric Control Unit

Courtesy of MERCEDES-BENZ USA

Location

The electric control unit (VGS), the valve body, the intermediate panel and the valve housing are connected together with bolts and mounted under the transmission housing.

Task

The electric control unit (VGS) receives the various input signals and converts the control unit information into hydraulic functions.

Fig 2: Identifying Electric Control Unit Components

Courtesy of MERCEDES-BENZ USA

Design

The electric control unit (VGS) consists of a plastic supporting body in which the following electrical components are combined:

Turbine speed sensor (VGS)
Internal speed sensor (VGS)
Output speed sensor (VGS)
Fully integrated transmission control (VGS) control unit with integral transmission oil temperature sensor (VGS) (Y3/8s2)
Selection range sensor (VGS)
Working pressure control solenoid valve (VGS)
K1 clutch control solenoid valve (VGS)
K2 clutch control solenoid valve (VGS)
K3 clutch control solenoid valve (VGS)
B1 brake control solenoid valve (VGS)
B2 brake control solenoid valve (VGS)
B3 brake control solenoid valve (VGS)
Torque converter lockup clutch control solenoid valve (VGS)

The printed-conductor foil which is inserted in the supporting body makes the connection between the electrical components and the plug socket.

Apart from the solenoid valves all the other electrical components are permanently connected to the printed-conductor foil.

The connection to the cable set on the vehicle side is made with a bayonet lock via the plug socket.

Input and output signals

Fig 3: Identifying Input And Output Signals Of Electric Control Unit

Courtesy of MERCEDES-BENZ USA

Function

In the electric control unit (VGS) signals from the fully integrated transmission control (VGS) control unit are converted into hydraulic functions. The following electrical components provide input signals to the fully integrated transmission control (VGS) control unit:

Turbine speed sensor (VGS)
Internal speed sensor (VGS)
Output speed sensor (VGS)
Transmission oil temperature sensor (VGS), integrated into the fully integrated transmission control (VGS) control unit
Selection range sensor (VGS)

The control solenoid valves listed are actuated by the fully integrated transmission control (VGS) control unit and trigger hydraulic functions:

Working pressure control solenoid valve (VGS)
B1 brake control solenoid valve (VGS)
B2 brake control solenoid valve (VGS)
B3 brake control solenoid valve (VGS)
K1 clutch control solenoid valve (VGS)
K2 clutch control solenoid valve (VGS)
K3 clutch control solenoid valve (VGS)
Torque converter lockup clutch control solenoid valve (VGS)