(Gasoline Injection And Ignition System With Direct Injection, Function - GF07.70-P-0002MMU)

Engine 276.8 in MODEL 166

up to model year 2016

Courtesy of MERCEDES-BENZ USA

Block diagram for networking the direct line

Courtesy of MERCEDES-BENZ USA

Block diagram for CAN-networking

Gasoline injection and ignition system with direct injection, general points

The gasoline injection and ignition system with direct injection forms the Engine management "MED 17.7.3" in an electrical combination with the sensors and actuators of Engine 276.8 DI (D irect-I njection).

The short designation MED 17.7.3 means:

M = Motronic

E = E lectronic accelerator pedal

D = D irect injection

17.7.3 = Version 17.7.3

The whole Engine management is contained in the ME-SFI [ME] control unit. Sensor data are directly read in from the Engine management and indirectly via the CAN network and actuate the control actuators as required. Here the individual functions and systems of the Engine management are controlled and coordinated by the ME-SFI [ME] control unit.

The following table represents the model and major assembly overviews for the Engine 276.8:

Sales designation	Model	Motor	Transmission	Engine management
Model series 166
ML 400 4MTIC	166.056	276.821	722.904	MED 17.7.3
ML 320 4MTIC	166.062	276.821	722.904	MED 17.7.3
LG 400 4MTIC	166.856	276.821	722.904	MED 17.7.3

The Engine management is subdivided into the following systems:

Base functions
Engine system
Fuel injection system
Ignition system
Exhaust system

Base functions

Control unit diagnosis
Fault memory
OBD II (OBD II)
Diagnosis via CAN
CAN network
Flash programming
Variant coding
Drive authorization system stage 3 (DAS 3)
Torque coordination
Thermal management
Alternator interface
Maximum speed limit

For diagnostic purposes, the fault codes of the Engine management system can be read out and deleted using Xentry Diagnostics, and individual diagnostic functions can be specifically actuated.

In transport mode various functions of the Engine management are limited. Further information is available in the energy management function. If the kilometer reading of the vehicle is more than 250 km, the system condition "vehicle transport mode" is automatically deactivated and can also not be reactivated anymore using the diagnostic equipment.

The ME-SFI [ME] control unit exchanges data with other control units over the connected drive train CAN and chassis CAN 1 which are integrated in the CAN network. The ME-SFI [ME] control unit also acts as the interface (gateway) between the two CAN bus systems. It is also connected to the drive train LIN and exchanges data over it.

The Engine management in the ME-SFI [ME] control unit is flushable, that is the complete software in the control unit can be replaced using the Xentry diagnostics (replaced). The software required for control unit programming can be found on the software DVD.

With variant coding the following vehicle versions and equipment can, for example, be coded using XENTRY Diagnostics:

Vehicle model
National version
Exhaust variants
Transmission version

Engine system

Starter relay actuation
Throttle valve control
Safety fuel shutoff
Transmission overload protection
Electronic Stability Program control unit support
Fully integrated transmission control support
Driving on torque limitation
Fan control
Throttle valve calibration
Regulated adjustment of the intake and exhaust camshafts
Boost pressure control (over wastegate)
ECO start/stop function (with CODE B03 (ECO start/stop function))

Fuel injection system

Cylinder-selective DI
Start, post-start phase and acceleration enrichment
Warm-up control
Idle speed control
Limp-home function
Rpm increase for an activated A/C
Inertia fuel shutoff
Fuel pump controlling
Altitude adaptation
Load change function
Rpm limitation

Ignition system

Multi-spark ignition
Ignition map
Rpm limitation
Knock control
Synchronization of camshaft and crankshaft position

Exhaust system

Catalytic converter heating
Oxygen sensor heater controlling
Straight-line lambda control

The operating conditions of the Engine and the associated active partial functions of the Engine management are described in the following documents:

Ignition ON, function		GF07.10-P-1000MMG
Starting, function		GF07.10-P-1001MMG
Ignition OFF, function		GF07.10-P-1002MMG
Fuel supply, function		GF07.10-P-1003MMG
Injection regulation, function		GF07.10-P-1004MMU
Ignition system function		GF07.10-P-1005MMU
Synchronize fuel injection and firing order function		GF07.10-P-1006MMG
Start, post-start phase and warm-up enrichment, function		GF07.10-P-1007MMU
Rpm control, function		GF07.10-P-1008MMG
Alternator interface function		GF07.10-P-1009MMG
Lambda control, function		GF07.10-P-1010MMG
Smooth running control, function		GF07.10-P-1011MMG
Thermal management, function		GF07.10-P-1012MMU
Torque coordination, function		GF07.10-P-1013MMG
Deceleration fuel shutoff, function		GF07.10-P-1014MMG
Knock control, function		GF07.10-P-1015MMU
Camshaft adjustment, function		GF07.10-P-1016MMG
Engine limp-home mode, function		GF07.10-P-1019MMG
On-board diagnosis, function		GF07.10-P-1020MMG
Engine timing start-stop function	Engine 276.8 in MODEL 166 up to model year 2016 with CODE B03 (ECO start/stop function) The "ECO start/stop function" is seen from the point of view of the Engine management. Information for the partial function "ECO start/stop function energy management" is documented in the function description "Energy management function".	GF07.10-P-1041MMR
Charging, function		GF09.00-P-2000MMU
Exhaust treatment function		GF14.00-P-3000MMG
Electronic accelerator function		GF30.20-P-3015MMG
On-board refueling vapor recovery function	Engine 276.8 in MODEL 166 up to model year 2016 with CODE 494 (US version)	GF47.10-P-3004MMG
Purging function		GF47.30-P-3015MMR
Purging system with leak test function	Engine 276.8 in MODEL 166 up to model year 2016 with CODE 494 (US version)	GF47.30-P-3016MMR
Overview of system components for gasoline injection and ignition system with direct injection		GF07.70-P-9998MMU