Automatic Start/Stop - SMART 453 Series Introduction Into Service Manual

Automatic start/stop

Automatic start/stop
In order to reduce the fuel consumption and exhaust emis-
sions of the vehicle, the new smart is equipped with an au-
tomatic start/stop function as standard (does not apply to
45 kW version).
The automatic start/stop function shuts off the engine au-
tomatically when the vehicle stops if the relevant conditions
are fulfilled. The engine then restarts automatically to drive
off again.
The driver-side SAM control unit acts as the master control
unit for the automatic start/stop function. It prompts the ME-
SFI [ME] control unit to stop or start the engine depending on
incoming sensor data and the data which it receives from the
center SAM control unit, Electronic Stability Program control
unit, climate control control unit and Supplemental Restraint
System control unit. The output device for start/stop system
messages is the instrument cluster.
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Conditions for automatic engine stop
For the automatic start/stop function to automatically shut
off the engine, the driver must brake the vehicle to a stand-
still, put the vehicle into neutral and release the clutch pedal
or select gear range N. If the following conditions are also
met, the engine is shut off and the ECO start/stop function
"available" indicator lamp lights up on the instrument cluster:
• Engine is at operating temperature
• Driver door is closed and driver seat belt is fastened
• Battery is sufficiently charged
• Temperature in vehicle interior corresponds to setting
• Outside temperature is within a suitable range for the
system
• Automatic start/stop indicator lamp is not on
• Liftgate is closed
Conditions for automatic engine start
The engine is started automatically when
• The driver depresses the clutch pedal
• The automatic start/stop function is switched off via the
automatic start/stop button
• The temperature in the vehicle interior is no longer within
the set range
If all of the conditions for an automatic engine start are not
fulfilled, the ECO start/stop function "not available" indicator
lamp lights up.
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453