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Automatic Engine Start/Stop
Function
The concept
The Auto Start/Stop function helps save fuel.
The system switches off the engine during a
stop, e.g., in a traffic congestion or at traffic
lights. The ignition remains switched on. The
engine starts again automatically for driving
off.
Certain vehicle components may experience
additional wear as a result of this system.
Automatic mode
The Auto Start/Stop function is operational af‐
ter each engine start.
This function is activated at speeds faster than
about 3 mph, approx. 5 km/h.
Engine stop
The engine is switched off automatically dur‐
ing a stop under the following conditions:
Automatic transmission:
▷ The selector lever is in transmission posi‐
tion D.
▷ The brake pedal remains pressed while the
vehicle is stationary or the vehicle is held
by Automatic Hold.
▷ The driver's seat belt is buckled or the driv‐
er's door is closed.
The air volume of the air conditioner is reduced
when the engine is switched off.
Displays in the instrument cluster
The display indicates that the
automatic engine start-stop
function is ready for an auto‐
matic engine start.
The display indicates that the
conditions for an automatic en‐
gine stop have not been satis‐
fied.
Note
The engine is not switched off automatically in
the following situations:
▷ External temperature too low.
▷ The external temperature is high and auto‐
matic climate control is running.
▷ The passenger compartment has not yet
been heated or cooled to the required
level.
▷ The engine is not yet at operating temper‐
ature.
▷ The wheels are at a sharp angle or the
steering wheel is being turned.
▷ After driving in reverse.
▷ Fogging of the windows when the auto‐
matic climate control is switched on.
▷ Vehicle battery is heavily discharged.
▷ The engine compartment lid is unlocked.
▷ HDC Hill Descent Control is activated.
▷ The parking assistant is activated.
▷ Stop-and-go traffic.
▷ The transmission selector lever is in posi‐
tion N or M/S.
▷ Use of fuel with high ethanol content.
Starting the engine
The engine starts automatically under the fol‐
lowing conditions:
▷ Automatic transmission:
By releasing the brake pedal.
When Automatic Hold is activated: press
the accelerator.
After the engine starts, accelerate as usual.
Seite 68
Controls Driving
68
Online Edition for Part no. 01 40 2 909 749 - VI/13
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