I believe the engine has what MBZ calls 'electronic accelerator ' (EA) as part of the Anti-slip Reduction (ASR) system.

The EA works by sensing the position of the accelerator with a potientometer {a variable resistor} which is linked to the accelerator linkage. When you push on the accelerator pedal, you move the potientometer which is located in the throttle actuator on the engine. That movement is sensed by the EA computer which then sends an electrical signal back to the throttle actuator to1) engage the magnetic clutch, linking the throttle motor to the throttle butterfly shaft, and, 2) rotate the throttle motor until the throttle plate is opened the correct amount. THE EA computer senses the throttle plate position with another potientometer hard connected to the throttle plat shaft.

All these potientometers, throttle motor, magnetic clutch and inside the throttle actuator housing.

IN ADDITION to the electrical control linkage, there IS mechanical linkage that will open the throttle shaft a small amount to clear flooding.

You should not open the throttle from the engine compartment. That will usually send the system into 'limp mode' which requires a trip to the Dealer or good indy with proper (expensive) diagnostic computer) to clear.

What happens is there is a position switch attached to the top of the accelerator, and if the EA computer senses throttle shaft movement (remember the position sensor) without that accelerator position switch closed, OR the throttle shaft position exceeds what the EA computer is asking for, it figures something is dangerously wrong, the engine is trying to run faster that the accelerator is asking for, and immediately disconnects the magnetic clutch and sets the 'limp in' mode.

This system prevents 'unintended acceleration' from happening.

The variable resistors on the accelerator linkage changes from high resistance to low resistance as you push on the accelerator, while the throttle shaft position sensor goes the other way and the computer continuously monitors the positions so that if one changes instantly (like a loose connection ), the system again shuts off.