E 320 4MATIC Wagon (210.282) V6-3.2L (112.941) (1998)
Illustration shows actuator M16/4
(further designations: M16/1, M16/3, M16/6 throttle valve actuator)
1
Throttle valve
2
Return spring
3
Spring capsule (mechanical stop)
4
Transmission
5
Throttle valve drive shaft
M16/4m1 Actuator motor
M16/4r1 Actual value potentiometer 1 Throttle valve
M16/4r2 Actual value potentiometer 2 Throttle valve
Function
The actual value potentiometers for the throttle valve inform the ME control unit about the position of the throttle valve (idling up to full load) in order
to recognise the various loading conditions.
A. Ignition "Off"
In the de-energized state the throttle valve position is determined by the spring capsule (3).
B. Ignition "On"
When the ignition is switched on, the actuator motor in the EA/CC/ISC actuator is operated by the ME control unit and the return spring is checked.
The throttle valve adopts a position which then depends on the coolant temperature.
C. Idle speed
The actuator motor controls the engine speed in the idle speed range by opening the throttle valve further, depending on coolant temperature and
engine load (increased mixture), or closing it further (reduced mixture).
In this case, the throttle valve may be closed further by the actuator motor by overcoming the force of the spring capsule (mechanical end stop).
If the actuator is de-energized, the throttle valve is resting against the spring capsule. As a result the throttle valve opening is constantly approx. 10 to
12 °. The engine speed for the no load condition is about 1800 rpm.
D. Driving mode
The actuating motor when driving (partial/full load) regulates the throttle valve according to the various loading conditions or according to the input
signals from the front pedal value sensor (B37) according to the position of the accelerator pedal.
E. Throttle valve damping