Component description for throttle valve actuator

P07.61-2717-01

View of the engine from above

B17/8 Charge air temperature sensor

B28/4 Pressure sensor downstream of air filter, left cylinder bank

B28/5 Pressure sensor downstream of air filter, right cylinder bank

B28/6 Pressure sensor upstream of throttle valve actuator

M16/6 Throttle valve actuator

Location

The throttle valve actuator is located at the rear of the intake manifold.

Task

The throttle valve actuator regulates the functions:

- Idle speed

- Driving mode (according to accelerator pedal position and engine load)

- Cruise control function or Distronic mode (if Distronic installed)

- Electronic accelerator limp-home mode

Function

The actuator motor (M16/6m1) in the throttle valve actuator adjusts the opening angle of the throttle valve continuously from approx. 0 to 90° according to specifications from the ME-SFI [ME] control unit (N3/10).

Both counter-moving actual value potentiometers 1 and 2 (M16/6r1, M16/6r2) inform the ME-SFI [ME] control unit about the current position of the throttle valve.

In deenergized status (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 preconditions:

- Gear range "P" or "N" engaged

- 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 actuator.

The adaptation is performed within about 60 s after first energization (ignition ON) and comprises:

- Identified limp-home position

- Identified lower mechanical end stop of throttle valve

- Matches the actual value amplifier (signals 1 and 2) in the ME-SFI [ME] control unit.

- Checking the return spring



The throttle valve actuator can also be adapted manually with the DAS.