Powertrain Management: Description and Operation
GF07.70-P-0002MMA Gasoline Injection and Ignition System With Direct Injection, Function
ENGINES 278.9 in MODEL 207.3 /4, 212.0 /2, 218
ENGINES 157.9 in MODEL 212.0 /2, 218
Block diagram
A1 Instrument cluster
A1e4 Fuel reserve indicator lamp
A1e58 Engine diagnosis indicator lamp
A1p13 Multifunction display
A29/1 Left cylinder bank front knock sensor
A29/2 Left cylinder bank rear knock sensor
A30/1 Right cylinder bank front knock sensor
A30/2 Right cylinder bank rear knock sensor
B4/1 Left fuel level indicator sensor (model 207, 212), left fuel level indicator fuel tank fuel level sensor (model 218)
B4/2 Right fuel level indicator sensor (model 207, 212), right fuel level indicator fuel tank fuel level sensor (model 218)
B4/3 Fuel tank pressure sensor (with code (494) USA version)
B4/7 Fuel pressure sensor (model 207, 212), fuel pressure sensor (model 218)
B4/25 Fuel pressure and temperature sensor
B6/4 Left intake camshaft Hall sensor
B6/5 Right intake camshaft Hall sensor
B6/6 Left exhaust camshaft Hall sensor
B6/7 Right exhaust camshaft Hall sensor
B11/4 Coolant temperature sensor (model 207, 212), coolant temperature sensor (model 218)
B11/15 Cooler sensor for engine diagnosis (on engine 278, with code (494) USA version and code (917) Partial zero emission vehicle USA)
B17/8 Charge air temperature sensor
B28/4 Pressure sensor downstream of air filter, left cylinder bank
B28/5 Pressure sensor downstream of air filter, right cylinder bank
B28/6 Pressure sensor upstream of throttle valve
B28/7 Pressure sensor downstream of throttle valve
B37 Accelerator pedal sensor
B40 Oil sensor (oil level, temperature and quality) (with engine 157)
B64/1 Brake vacuum sensor (vehicles with code (B03) ECO start/stop function)
B70 Crankshaft Hall sensor
CAN B Interior CAN
CAN C Drive train CAN
CAN D Diagnostic CAN
CAN E Chassis CAN
G1 On-board electrical system battery
G2 Alternator
G3/3 Left oxygen sensor upstream of catalytic converter
G3/4 Right oxygen sensor upstream of catalytic converter
G3/5 Left oxygen sensor downstream of catalytic converter
G3/6 Right oxygen sensor downstream of catalytic converter
K60 Coolant circulation pump relay
L6/1 Left front axle speed sensor
L6/2 Right front axle speed sensor
L6/3 Left rear axle speed sensor
L6/4 Right rear axle speed sensor
LIN 1 Instrument panel LIN
LIN C1 Drive train LIN
M1 Starter
M3 Fuel pump
M4/7 Combustion engine and air conditioning with integrated control fan motor
M16/6 Throttle valve actuator
M45 Coolant circulation pump
N2/10 Supplemental restraint system control unit (model 207, 212), supplemental restraint system control unit (model 218)
N3/10 ME-SFI [ME] control unit
N10/1 Front SAM control unit with fuse and relay module
N10/1kJ Circuit 15 relay
N10/1kM Starter circuit 50 relay
N10/1kN Engine circuit 87 relay
N10/2 Rear SAM control unit with fuse and relay module
N22/7 Automatic air conditioning control and operating unit
N30/4 Electronic Stability Program control unit (except code (233) DISTRONIC PLUS)
N30/7 Premium Electronic Stability Program control unit (vehicles with code (233) DISTRONIC PLUS)
N51/3 AIRmatic control unit (with code (489) AIRMATIC (air suspension with continuously adjustable damping))
N62/2 Video and radar sensor system control unit (with code (233) DISTRONIC PLUS, with code ( 237) Active Blind Spot Assist, with code ( 238) Active Lane Keeping Assist), N69/1 Left front door control unit
N72/1 Upper control panel control unit
N73 Electronic ignition switch control unit
N80 Steering column module control unit
N118 Fuel pump control unit
R48 Coolant thermostat heating element
S9/1 Stop lamp switch
S40/4 Cruise control lever
S43 Oil level check switch (for engine 278)
T1/1 Cylinder 1 ignition coil
T1/2 Cylinder 2 ignition coil
T1/3 Cylinder 3 ignition coil
T1/4 Cylinder 4 ignition coil
T1/5 Cylinder ignition coil
T1/6 Cylinder 6 ignition coil
T1/7 Cylinder 7 ignition coil
T1/8 Cylinder 8 ignition coil
X11/4 Diagnostic connector
Y3/8 Fully integrated transmission control control unit
Y49/4 Left intake camshaft solenoid
Y49/5 Right intake camshaft solenoid
Y49/6 Left exhaust camshaft solenoid
Y49/7 Right exhaust camshaft solenoid
Y58/1 Purge control valve
Y58/4 Activated charcoal filter shutoff valve (with Code (494) USA version)
Y76/1 Cylinder 1 fuel injector
Y76/2 Cylinder 2 fuel injector
Y76/3 Cylinder 3 fuel injector
Y76/4 Cylinder 4 fuel injector
Y76/5 Cylinder 5 fuel injector
Y76/6 Cylinder 6 fuel injector
Y76/7 Cylinder 7 fuel injector
Y76/8 Cylinder 8 fuel injector
Y77/1 Boost pressure control pressure transducer
Y94/1 Left quantity control valve
Y94/2 Right quantity control valve
Y130 Engine oil pump valve
Gasoline injection and ignition system with direct injection, general points
The gasoline injection and ignition system with DI creates in an electrical combination with the sensors and actuators of engines 157 AMG and 278 DE (Direct-Injection) the engine timing "MED 17.7.1".
The abbreviated designation MED 17.7.1 means:
M = Motronic
E = Electronic accelerator pedal
D = Direct injection
17.7.1 = Version 17.7.1
The ME-SFI [ME] control unit contains the whole engine control.
The engine control system reads in sensor data both directly and via the CAN network and actuates the corresponding actuators. Here the individual functions and systems of the engine timing are controlled and coordinated by the ME-SFI [ME] control unit.
The following table represents the model and major assembly overviews for the engines 157 and 278:
The engine control is subdivided into the following systems:
^ Basic functions
^ Engine system
^ Injection system
^ Ignition system
^ Exhaust system
Basic functions
- Control unit diagnosis
- Fault memory
- On-board diagnosis II (OBD II)
- Diagnosis via CAN
- CAN network
- Flash programming
- Variant coding
- Drive authorization system stage 3 (DAS 3)
- Torque coordination
- Heat management
- Alternator interface
- Maximum vehicle speed limit
Diagnosis
For diagnostic purposes, the fault codes from the engine control can be read off and deleted with Xentry Diagnostics, and specific diagnostic functions initiated.
CAN network
The ME-SFI [ME] control unit exchanges data with other control units via the connected drive train CAN and chassis CAN 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.
Flash programming
The engine timing in the ME-SFI [ME] control unit is flash programmable, 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 Star Diagnosis software DVD.
Variant coding
Using variant coding the following vehicle versions and equipment can be coded using Xentry Diagnostics:
- Vehicle model
- National version
- Exhaust variants
- Transmission version
Engine system
- Start relay actuation
- Throttle valve control
- Safety fuel shutoff
- Transmission overload protection
- Support for Electronic Stability Program (ESP)
- Support for fully integrated transmission control (VGS)
- Starting torque limitation
- Suction fan actuation
- Calibration of throttle valve
- Controlled adjustment of the intake and exhaust camshafts
- Boost pressure control (via wastegate)
- Control of the engine start/stop function (for code (B03) ECO start/stop function)
Injection system
- Cylinder-selective DI (homogeneous mode)
- Start, post-start phase and acceleration enrichment
- Warm running regulation
- Idle speed control
- Limp-home function
- Speed increase for air conditioning
- Inertia fuel shutoff
- Fuel pump control
- Altitude adaptation
- Load change function
- Rpm limitation
Ignition system
- Single spark ignition
- Ignition map
- Rpm limitation
- Knock sensor system
- Synchronization of camshaft and crankshaft positions
Exhaust system
- Catalytic converter heating
- Oxygen sensor heater control
- Straight-line lambda control
The operating conditions of the engine and the concurrently active engine control subfunctions are described in the following documents:
^ Ignition ON, function
^ Starting, function
^ Ignition OFF, function
^ Fuel supply, function
^ Injection regulation, function
^ Ignition system function
^ Synchronize fuel injection and firing order function
^ Start, post-start phase and warm-up enrichment, function
^ Rpm control, function
^ Alternator interface, function
^ Lambda control, function
^ Smooth running control, function
^ Thermal management, function
^ Torque coordination, function
^ Deceleration fuel shutoff, function
^ Knock control, function
^ Camshaft adjustment, function
^ Engine limp-home mode, function
^ On-board diagnosis, function
^ Engine timing start stop function (for code (B03) ECO start/stop function)
^ Forced induction, function
^ Exhaust treatment, function
^ Electronic accelerator function
^ Refueling gas recovery function (with code (494) USA version)
^ Purging function
^ System purging with leak test function (with code (494) USA version)
