Component description for the throttle valve actuator - GF30.20-P-2020V

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ENGINE 272.967 in MODEL 164, 251

ENGINE 273.923 in MODEL 164

ENGINE 273.943 in MODEL 164

ENGINE 273.963 in MODEL 164, 251

Fig 1: Identifying Throttle Valve Actuator

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Location

The throttle valve actuator is flanged to the intake manifold at the rear.

Task

The throttle valve actuator regulates the functions:

Idle speed
Drive mode, according to accelerator pedal position, load and requests of momentary interface
Engine 272.985: In stratified charge operation with excess air, open the throttle valve as far as possible according to the performance map.
Cruise control mode
Emergency electronic accelerator pedal

Design

Fig 2: Throttle Valve Actuator Design

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: Identifying Throttle Valve Actuator Circuit Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Function

The actuator motor (M16/6m1) in the throttle valve actuator (M16/6) adjusts the opening angle of the throttle valve (1) continuously from approx. 0 to 90° according to presets from the ME-SFI [ME] control unit.

The typical power consumption of the pulse width modulation signal is approx. 1 A, however it is possible up to approx. 9 A. For output stage protection the power is limited to 6 A after approx. 30 seconds. The actual value potentiometers (M16/6r3, M16/6r4) advise the current position of the throttle valve to the ME-SFI [ME] control unit. The signals of both actual value potentiometer are opposed.

Ignition "Off"
In a de-energized state, the throttle valve position is determined by the spring capsule (3) (8 up to 10° opening angle).
Ignition "On"
When the ignition is switched on, the actuator motor in the throttle valve actuator is operated by the ME-SFI [ME] control unit.

The throttle valve adopts a position which depends on the coolant temperature.
No-load speed
Depending upon the coolant temperature and engine load, the actuator motor changes the rpm in the idle speed range by opening the throttle valve further (increased mixture) or closing it further. (less mixture). Here, the throttle valve can be closed further by the actuator motor against the force of the spring capsule.
Driving mode
In the driving mode (full / partial load), the actuator motor changes the throttle valve position depending on the different load states and / or according to the input signals from the accelerator pedal sensor dependent on the performance maps.
Emergency running
If the actuator is de-energized, the throttle valve is set by the spring capsule to approx. 8 to 10° opening angle.

In the idle speed range, this results in an engine speed of approx. 1200 to 1400/min.

For first time connection of the throttle valve actuator to circuit 30 or 87, the ME-SFI [ME] control unit carries out automatically within approx. 60 seconds the following actions:

Determines the emergency running position
Determines lower mechanical stop
Matches the actual value amplifier (signal 1 and 2) in the ME-SFI [ME] control unit.
Checks the return spring (always takes place when ignition ON) Prerequisite: gear P or N, vehicle stationary, engine OFF, ignition ON, coolant temperature 5°C to 100°C and accelerator pedal not operated.

The procedure must be activated with STAR DIAGNOSIS, if the throttle valve actuator or the ME-SFI [ME] control unit was replaced, otherwise engine surges can occur.