Throttle valve actuator, function - GF30.22-P-4101-02M

Fig 1: Identifying Throttle Valve Actuator Components

Courtesy of MERCEDES-BENZ USA

Fig 2: Throttle Valve Actuator Internal Circuit Diagram

Courtesy of MERCEDES-BENZ USA

The actuator motor (M16/6m1) in the throttle valve actuator (M16/6) adjusts the throttle valve (1) continuously from about 0 to 90° according to specifications from motor electronics 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. The power is limited to 6 A after approx. 30 seconds for output stage protection.

The actual value of potentiometers (M16/6r3, M16/6r4) inform the motor electronics control unit about the position of throttle valve.

The signals of both actual value potentiometer are opposed.

A. Ignition "Off"

In the voltage-free condition the throttle valve position is determined by the spring capsule (2) (8 up to 10° opening angle).

B. Ignition "On"

When the ignition is switched on, the actuator motor in the throttle valve actuator is operated by the ME control unit.

The throttle valve adopts a position which depends on the coolant temperature.

C. Idling speed

Depending upon the coolant temperature and engine load, the actuator motor changes the RPM in the idling 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 force of the spring capsule.

D. 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.

E. Emergency running

If the actuator is de-energized, the throttle valve is set by the spring capsule to an about 8 up to 10° opening angle.

This in the idling speed range results in an engine speed of around 1800 RPM

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

Determining the emergency running position
Determining the lower mechanical stop
Adaptation of the actual value amplifier (signal 1 and 2) in the ME control unit
Inspection of return spring (always performed with ignition ON)

Requirement: Drive position P or N, vehicle is stationary, engine OFF, ignition ON, coolant temperature 5°C up to 100°C and accelerator pedal not operated.

The procedure must be activated with STAR DIAGNOSIS, if the throttle valve actuator or the motor electronics control unit was replaced, otherwise engine surges can occur.