Component description for the throttle valve actuator - GF30.20-P-2021CY

WARNING: This page is about a different car, the 2011 Mercedes-Benz C300, 2010 Mercedes-Benz C300, 2009 Mercedes-Benz C300, and 2008 Mercedes-Benz C300. However, it is still accessible from the selected car via links, so may be relevant.

ENGINE 272.911 in MODEL 204.0 up to Model Year 2008

ENGINE 272.921 in MODEL 204.0/2 up to Model Year 2008

ENGINE 272.947 in MODEL 204.0/2 up to Model Year 2008

ENGINE 272.948 in MODEL 204.0 up to Model Year 2008

ENGINE 272.961 in MODEL 204.0/2 up to Model Year 2008

ENGINE 272.971 in MODEL 204.0 up to Model Year 2008

Location

Fig 1: Locating Throttle Valve Actuator

Courtesy of MERCEDES-BENZ USA

The throttle valve actuator it located at the rear on the variable intake manifold.

Task

The throttle valve actuator regulates the functions:

Idle speed
Driving mode (according to accelerator pedal position and engine load)
Cruise control mode
Electronic accelerator emergency mode

Design

Fig 2: Identifying Throttle Valve Actuator Components

Courtesy of MERCEDES-BENZ USA

Function

Fig 3: Throttle Valve Actuator Function Diagram

Courtesy of MERCEDES-BENZ USA

The actuator motor in the throttle valve actuator adjusts the opening angle of the throttle valve continuously from approx. 0 to 90° according to the presets from the ME-SFI [ME] control unit (N3/10).

The two actual value potentiometers operating in opposite directions inform the ME-SFI [ME] control unit about the current position of the throttle valve.

In a de-energized state (e.g. limp-home), the opening angle of the throttle valve (from 10 to 12°) is determined by the return spring (limp-home position).

The throttle valve actuator performs checking of its return spring for ignition ON under the following conditions:

Drive position P or N engaged (with automatic transmission 722.9)
Vehicle at rest
Engine OFF
Coolant temperature between 5 and 100°C
Accelerator not operated

For first time connection of a throttle valve actuator to the vehicle, the ME-SFI [ME] control unit automatically executes adaptation of the throttle valve actuator.

Adaptation is executed within about 60 seconds after first energization (ignition ON) and includes:

Determination of the emergency running position
Determination of the lower mechanical stop of the throttle valve
Adaptation of the actual value amplifier (signals 1 and 2) in the ME-SFI [ME] control unit
Checking the return spring