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Engine Timing Start-Stop Function - GF07.10-P-1041MNB

Engine 178.9 In Model 190 

IMPORTANT The ECO start/stop function is subdivided into the engine-side and the on-board network side scope. In this document, they are seen from the viewpoint of the engine management.

Function requirements, general 

IMPORTANT The ME-SFI [ME] control unit (N3/10) detects the engine running via the evaluation of the crankshaft Hall sensor signals (B70). The ME-SFI [ME] control unit directly reads in the signals of the crankshaft Hall sensor.

IMPORTANT The front SAM control unit with fuse and relay module (N10/1) sends the outside temperature via suspension CAN 1 (CAN E1), powertrain control unit (N127), and drive CAN (CAN C1) to the ME-SFI control unit.

ECO start/stop function, general points 

For a stationary vehicle, the ECO start/stop function automatically switches off the engine and starts it again as soon as the driver wishes to drive off or the system requests engine running. The fuel consumption and thus the exhaust gas emissions are reduced by switching off the engine at vehicle stillstand.

It is still possible to stop and start the engine in the conventional way.

The ME-SFI [ME] control unit permanently performs an SD and assesses the system conditions for the ECO start/stop function.

All active systems that may be impaired by a shutoff engine constantly check their status. Once the status of a systems permits an engine stop, it transmits its approval to the ME-SFI control unit.

The operational readiness of the ECO start/stop function is shown to the driver by the "ECO" symbol in the instrument cluster (A1).

The ME-SFI control unit sends the request to switch on the "ECO" symbol via the engine CAN (CAN C), powertrain control unit, suspension CAN 1, AMG gateway control unit (N93/9), and the user interface CAN (CAN HMI) to the instrument cluster.

The ECO start/stop function is activated and deactivated via the ECO start/stop function button (S193/5). The on/off button with volume control (S67) reads in the status of the ECO start/stop function button directly and sends this via the audio LIN (LIN A4) to the Audio/COMAND control panel (A40/9) (except code 446 (touchpad only)) or to the touchpad (A105) (with code 446 (touchpad only)). Then, the status is forwarded via the telematics CAN (CAN A), head unit (A26/17), user interface CAN, AMG gateway control unit, suspension CAN 1, powertrain control unit, and drive CAN to the ME-SFI control unit.

The ECO start/stop function contains the following subfunctions:

Automatic engine stop 

The engine is switched off if all of the following prerequisites are fulfilled:

IMPORTANT After an automatic engine stop a maximum of three automatic engine stops are permitted without exceeding the speed threshold of 8 km/h.

After the fourth engine start, the vehicle must exceed a speed of 8 km/h for the engine to be stopped again.

Upon opening the engine hood in automatic engine stop, the ECO start/stop function is switched off and all indicator symbols in the instrument cluster light up. The engine must then be restarted by the driver.

Automatic engine start 

The engine is started automatically if one of the following events occurs:

IMPORTANT A maneuvering process is recognized for an engaged gear range "R" and the ECO start/stop function is deactivated. If the engine is stopped it is force started by the system and the engine stop function is suppressed if it is running. The ECO start/stop function is subsequently activated again for an engaged gear range D and for exceeding a vehicle speed of 15 km/h.

Forced engine start (start dictated by the system) 

To ensure the on-board electrical system stability and the function of the safety-relevant systems, the engine can be force started by the system.

The engine is started if the on-board electrical system is e.g. placed under strain by load-intensive consumers or a function or stop requirement is no longer met.

If the on-board electrical system stability can subsequently still not be ensured, the ECO start/stop function is switched off and the engine is no longer shut off.

The following events also lead to a forced engine start:

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