Component description of throttle valve actuator - GF30.20-P-2020SM

ENGINE 113.986

ENGINE 113.987

ENGINE 113.988

ENGINE 113.989

Fig 1: Identifying Throttle Valve Actuator - Engine 113.988

The throttle valve is located at the rear at the variable intake manifold.

Task

The throttle valve actuator controls the functions:

Idling speed
Driving mode, corresponding with the accelerator pedal position and load
Cruise control mode
Emergency electronic accelerator pedal

Design

Fig 2: Throttle Valve Actuator Design

Function

Fig 3: Identifying Throttle Valve Actuator Circuit Diagram

The actuator motor in the throttle valve adjusts the opening angle of the throttle valve continuously from around 0 to 90°, according to the preset from the ME control unit (N3/10).

Both actual value potentiometers advise the current position of the throttle valve to the ME control unit.

In de-energized status (e.g. limp-home) the opening angle of the throttle valve (from 10 to 12°) is determined by the spring capsule.

When the throttle valve actuator is connected to the vehicle for the first time, the motor electronics control unit carries out an adaptation of the actuator (learning the lower and upper mechanical end stop of the throttle valve) on its own.