Gasoline Injection And Ignition System With Direct Injection, Function - GF07.70-P-0002MRH
Engine 274.9 in Model 205.047/053/054/147/247/253
Engine 274.9 in Model 253.354/954
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 in electrical combination with the sensors and actuators of engine 274 (direct injection) forms the engine management system "MED40".
The short designation "MED40" stands for:
M = M otor
E = E lectronics
D = D irect injection
4 = 4 cylinder
0 = generation 0
The whole engine management is contained in the ME-SFI 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 control unit.
| Sales designation | Model | Motor | Transmission | Engine management | Notes |
|---|---|---|---|---|---|
| Model 205 | - | - | - | - | - |
| C 350 | 205.047 | 274.920 | 722.995 | MED40 | Sedan |
| C 300 e | 205.053 | 274.920 | 716.702 725.017 |
MED40 | Sedan |
| C 300 e | 205.054 | 274.920 | 725.047 | MED40 | 4MATIC sedan |
| C 350 | 205.147 | 274.920 | 722.995 | MED40 | Sedan (long wheelbase) |
| C 350 | 205.247 | 274.920 | 722.995 | MED40 | Wagon |
| C 300 e | 205.253 | 274.920 | 716.702 725.017 |
MED40 | Wagon |
| Model 253 | - | - | - | - | - |
| GLC 350 | 253.354 | 274.920 | 725.043 | MED40 | Coupe |
| GLC 350 | 253.954 | 274.920 | 724.268 725.043 |
MED40 | Cross-country Vehicle |
The engine management is subdivided into the following systems:
- Basic functions
- Engine system
- Hybrid drive system
- Fuel injection system
- Ignition system
- Exhaust system
Basic functions
- Control unit diagnosis
- Control module programming
- Fault memory
- European On-Board Diagnosis
- Diagnosis via CAN
- CAN network
- Transport mode
- Variant coding
- DAS stage 4 (FBS 4)
- Torque coordination
- Heat management
- Maximum vehicle 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.
CAN network
The ME-SFI [ME] control unit exchanges data with other control units that are integrated in the CAN network via the connected drive train CAN and engine CAN. The ME-SFI [ME] control unit also acts as the interface (gateway) between the two CAN bus systems.
Control module 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 diagnosis system software DVD.
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.
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
- Boost pressure control (over wastegate)
- Regulated adjustment of the intake and exhaust camshaft
- Control of automatic engine start/engine stop function
Hybrid drive system
- Energy management for the hybrid drive system
- Torque coordination for the hybrid drive system
- Automatic Start/Stop function
- Regenerative braking
Fuel injection system
- Cylinder-selective DI
- Gasoline high pressure regulation
- 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 (low fuel pressure)
- Altitude adaptation (integral pressure sensor in ME-SFI control unit)
- Load change function
- RPM limitation
Ignition system
- Multi-spark ignition
- Ignition map
- RPM limitation
- Knock sensor system
- 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 service information:
| Crankcase ventilation system, function | GF01.20-P-0001MRH | ||
| Ignition ON, function | GF07.10-P-1000MRH | ||
| Starting, function | GF07.10-P-1001MRH | ||
| Ignition OFF, function | GF07.10-P-1002MRH | ||
| Fuel supply, function | GF07.10-P-1003MRH | ||
| Injection regulation, function | GF07.10-P-1004MRH | ||
| Ignition system function | GF07.10-P-1005MRH | ||
| Synchronize fuel injection and firing order function | GF07.10-P-1006MRH | ||
| Start, post-start phase and warm-up enrichment, function | GF07.10-P-1007MRH | ||
| RPM control, function | GF07.10-P-1008MRH | ||
| Lambda control, function | GF07.10-P-1010MRH | ||
| Smooth running control, function | GF07.10-P-1011MRH | ||
| Thermal management, function | GF07.10-P-1012MRH | ||
| Torque coordination, function | GF07.10-P-1013MRH | ||
| Overrun mode fuel shutoff, function | GF07.10-P-1014MRH | ||
| Knock control, function | GF07.10-P-1015MRH | ||
| Camshaft adjustment, function | GF07.10-P-1016MRH | ||
| Engine limp-home mode, function | GF07.10-P-1019MRH | ||
| On-board diagnosis, function | GF07.10-P-1020MRH | ||
| Engine timing start-stop function | GF07.10-P-1041MRH | ||
| Charging, function | GF09.00-P-2000MRH | ||
| Exhaust treatment function | GF14.00-P-3000MRH | ||
| Electronic accelerator function | GF30.20-P-3015MRH | ||
| Refueling safety detection function | Engine 274.9 in Model 205.047 and Model 253.954 with code 494 (US version) | GF47.00-P-1000MRH | |
| On-board refueling vapor recovery function | Engine 274.9 in Model 205.047 and Model 253.954 with code 494 (US version) | GF47.10-P-3004MRH | |
| Purging function | GF47.30-P-3015MRH | ||
| Purging system with leak test function | Engine 274.9 in Model 205.047 and Model 253.954 with code 494 (US version) | GF47.30-P-3016MRH | |
| Overview of system components for gasoline injection and ignition system with direct injection | GF07.70-P-9998MRH |