Electric control unit, component description - GF27.19-P-5145G

TRANSMISSION 722.6 in MODEL 216, 221 up to Model Year 8

Fig 1: Identifying Valve Body Of Shift Plate And Electrical Control Unit

Courtesy of MERCEDES-BENZ USA

Location

The electric control unit is screwed to the shift plate valve body.

Fig 2: Identifying Electrical Control Unit Components Location

Courtesy of MERCEDES-BENZ USA

Design

The electric control unit consists of a plastic supporting body on which the following electrical components are located:

The rpm sensors
The control solenoid valves
The shift solenoid valves
The torque converter lockup PWM solenoid valve
The starter lockout contact
The transmission oil temperature sensor

Conductor tracks which are laid in the supporting body make the connection between the electrical components and a 13-pin plug socket.

The connection to the cable set at the vehicle end and to the ETC [EGS] control unit (N15/3) is made via this 13-pin plug.

Except for the solenoid valves all the electrical components are permanently connected to the conductor tracks.

Fig 3: Identifying Design Of EGS Control Unit

Courtesy of MERCEDES-BENZ USA

Function

In the electric control unit signals from the ETC [EGS] control unit are converted into hydraulic functions. The rpm sensors, the starter lockout contact and the transmission oil temperature sensor supply input signals to the ETC [EGS] control unit.

The solenoid valves are actuated by the ETC [EGS] control unit and trigger the hydraulic functions.