Gasoline Injection And Ignition System With Direct Injection, Function - GF07.70-P-0002MMX
Engine 276.8 in MODEL 166 (except 166.063)
as of model year 2016
Engine 276.8 in MODEL 292
Block diagram for networking the direct line
Block diagram for CAN-networking
Gasoline injection and ignition system with DI, general
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
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 | Notes |
|---|---|---|---|---|---|
| Model series 166 | |||||
| ML 400 4MTIC | 166.056 | 276.821 | 722.904 725.031 |
MED 17.7.3 | |
| ML 320 4MTIC | 166.062 | 276.821 | 722.904 | MED 17.7.3 | |
| ML 450 4MTIC | 166.064 | 276.821 | 722.904 | MED 17.7.3 | |
| LG 400 4MTIC | 166.856 | 276.821 | 722.904 725.031 |
MED 17.7.3 | |
| LG 450 4MATIC | 166.864 | 276.821 | 722.904 725.031 |
MED 17.7.3 | |
| GL 450 | 166.865 | 276.821 | 722.904 725.031 |
MED 17.7.3 | |
| Model series 292 | |||||
| GLE 400 4MATIC | 292.356 (Coupe) | 276.821 | 722.904 725.031 |
MED 17.7.3 | |
| GLE 320 4MATIC | 292.362 (Coupe) | 276.821 | 722.904 725.031 |
MED 17.7.3 | |
| GLE 450 4MATIC | 292.364 (Coupe) | 276.821 | 722.904 725.031 |
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
- European On-Board Diagnosis
- Diagnosis via CAN
- CAN network
- Flash programming
- Variant coding
- DAS stage 4 (FBS 4)
- Torque coordination
- Thermal management
- Alternator interface
- Maximum speed limit
Diagnosis
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.
Transport mode
In transport mode various functions of the Engine management are limited. Further information are available in the energy management function. If the kilometer reading on the vehicle is more than 250 km, the system condition "vehicle transport mode" is automatically deactivated and can also not be reactivated any more by the Xentry Diagnostics.
CAN network
The ME-SFI [ME] control unit exchanges data with other control units integrated in the CAN network over the connected drive train CAN and chassis CAN 1. The ME-SFI [ME] control unit also acts as an interface (Gateway) between the two CAN bus systems. It is also connected to the drive train LIN and exchanges data over it.
Control unit programming
The Engine management in the ME-SFI [ME] control unit is programmable, i.e. the complete software of the control unit can be exchanged (replaced) using XENTRY Diagnostics. The software required for control unit programming can be found on the diagnostic system software DVD.
Variant coding
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
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
- Deceleration 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-1000MNG | ||
| Starting, function | GF07.10-P-1001MNG | ||
| Ignition OFF, function | GF07.10-P-1002MNG | ||
| Fuel supply, function | GF07.10-P-1003MNG | ||
| Injection regulation, function | GF07.10-P-1004MMX | ||
| Ignition system function | GF07.10-P-1005MMX | ||
| Synchronize fuel injection and firing order function | GF07.10-P-1006MNG | ||
| Start, post-start phase and warm-up enrichment, function | GF07.10-P-1007MMX | ||
| Rpm control, function | GF07.10-P-1008MNG | ||
| Alternator interface function | GF07.10-P-1009MNG | ||
| Lambda control, function | GF07.10-P-1010MNG | ||
| Smooth running control, function | GF07.10-P-1011MNG | ||
| Thermal management, function | GF07.10-P-1012MMX | ||
| Torque coordination, function | GF07.10-P-1013MNG | ||
| Deceleration fuel shutoff, function | GF07.10-P-1014MNG | ||
| Knock control, function | GF07.10-P-1015MMX | ||
| Camshaft adjustment, function | GF07.10-P-1016MNG | ||
| Engine limp-home mode, function | GF07.10-P-1019MNG | ||
| European OBD, function | GF07.10-P-1021MNG | ||
| ECO start/stop function Engine management, function | The "ECO start/stop function Engine management" partial 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-1042MMY | |
| Charging, function | GF09.00-P-2000MMX | ||
| Exhaust treatment function | GF14.00-P-3000MNG | ||
| Electronic accelerator function | GF30.20-P-3015MNG | ||
| On-board refueling vapor recovery function | Engine 276.8 in MODEL 166 (except 166.063) as of model year 2016 with CODE 494 (US version) Engine 276.8 in MODEL 292 with CODE 494 (US version) |
GF47.10-P-3004MNG | |
| Purging function | GF47.30-P-3015MMY | ||
| Purge system with leak test, function | Engine 276.8 in MODEL 166 (except 166.063) as of model year 2016 with CODE 494 (US version) Engine 276.8 in MODEL 292 with CODE 494 (US version) |
GF47.30-P-3017MMY | |
| Overview of system components for gasoline injection and ignition system with direct injection | GF07.70-P-9998MMX |