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  • C-Class
  • Saloon
  • 03/2020
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Operation of the ECO start/stop function

The ECO start/stop function is available only in the , , and drive programs (depending on the setting).

If all vehicle-related conditions for an automatic engine stop are met, the engine is switched off automatically:

  • vehicles with manual transmission: you brake the vehicle, shift to transmission position when travelling at a low speed and then release the clutch pedal.

  • vehicles with automatic transmission: you brake the vehicle to a standstill in transmission position or .

  • vehicles with automatic transmission and a 48 V on-board electrical system: you depress the brake pedal when travelling at a low speed.

If the system has detected one of the following situations, the engine will not stop:

  • you stop at a stop sign and there is no vehicle in front of you.

  • the vehicle that stopped in front of you starts up again.

  • you manoeuvre, turn the steering wheel sharply or engage reverse gear.

When the HOLD function is active and in transmission position , the engine can stop in spite of an intelligent stop inhibitor.

The engine is restarted automatically if:

  • vehicles with manual transmission: you depress the clutch pedal.

  • vehicles with automatic transmission: you shift into transmission position or .

  • you depress the accelerator pedal.

  • an automatic engine start is required by the vehicle.

  • vehicles with automatic transmission and a 48 V on-board electrical system:

    • you release the brake pedal on a downhill gradient and the vehicle does not roll.

    • the vehicle rolls downhill; at 20 km/h glide mode is not activated automatically.

ECO start/stop function symbols in the multifunction display:

  • the symbol (green) appears when the vehicle is at a standstill: the engine was switched off by the ECO start/stop function.

  • the symbol (yellow) appears when the vehicle is at a standstill: not all vehicle conditions for an engine stop have been met.

  • neither the symbol nor appears when the vehicle is at a standstill: an intelligent stop inhibitor was detected, e.g. a stop sign.

If the engine was switched off by the ECO start/stop function and you leave the vehicle, a warning tone sounds and the engine is not restarted. In addition, the display message Vehicle is operational Switch off ignition before exiting appears in the multifunction display. If you do not switch off the ignition, the ignition is automatically switched off after three minutes.

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