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

WARNING: This page is about a different car, the 2011 Mercedes-Benz C350, 2010 Mercedes-Benz C350, 2009 Mercedes-Benz C350, and 2008 Mercedes-Benz C350. 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 8

ENGINE 272.921 in MODEL 204.0/2 up to Model Year 8

ENGINE 272.947 in MODEL 204.0/2 up to Model Year 8

ENGINE 272.948 in MODEL 204.0 up to Model Year 8

ENGINE 272.961 in MODEL 204.0/2 up to Model Year 8

ENGINE 272.971 in MODEL 204.0 up to Model Year 8

Location

Fig 1: Identifying 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 Design Of Throttle Valve Actuator

Courtesy of MERCEDES-BENZ USA

Function

Fig 3: Identifying Throttle Valve Actuator Circuit

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 (ignition ON) cycle 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