View of engine from the front |
N3/10 | ME-SFI [ME] control unit |
P07.70-2269-76
Location
The ME-SFI [ME] control unit is located at the center on the charge air distributor.
Tasks
The ME-SFI [ME] control unit fulfills the following tasks:
Controlling the engine basic functions
Reading in of signals
Evaluation of input factors
Output of signals and actuation of components
The ME-SFI [ME] control unit also acts as an interface (Gateway) between the attached CAN bus systems.
Controlling the engine basic functions
Exhaust treatment
Diagnosis and fault storage
Injection control
Electronic accelerator
Drive authorization system and immobilizer
Alternator interface
Regulated camshaft adjustment
Fuel supply
Boost pressure control
Torque interface
Engine management Start-Stop function
Thermal management
Ignition system
Reading in of signals
Input factors are read in over the following connections:
Direct line
Drive-LIN (LIN C1)
Drive train CAN (CAN C)
Chassis CAN 1 (CAN E1)
Evaluation of input factors
The input factors that have been read in are evaluated by the integrated microprocessor and the affected components are then actuated.
Output of signals and actuation of components
Initial parameter are output over the following connections:
Direct line
Drive train LIN
Drive train CAN
Chassis CAN 1
The front SAM control unit with fuse and relay module (N10/1) is the central interface (Gateway) for exchange of function-relevant data for control units which are connected to the various Control Area Network (CAN) bus systems.
Input factors and initial parameters for the following components are read in or output over direct lines by the ME-SFI [ME] control unit and are required by the engine management system:
Input factors over a direct line | Initial parameters over a direct line | Supplemental information |
Terminal 15 | – | – |
Circuit 30 (fused) | – | – |
Circuit 31 | – | – |
Circuit 87M4 | – | – |
Knock sensor 1 (A16/1) | – | – |
Knock sensor 2 (A16/2) | – | – |
Knock sensor 3 (A16/3) | – | – |
Knock sensor 4 (A316/4) | – | – |
Fuel tank pressure sensor (B4/3) | – | With CODE 494 (USA version) |
Fuel pressure and temperature sensor (B4/25) | – | – |
Left intake camshaft Hall sensor (B6/4) | – | – |
Right intake camshaft Hall sensor (B6/5) | – | – |
Left exhaust camshaft Hall sensor (B6/6) | – | – |
Right exhaust camshaft Hall sensor (B6/7) | – | – |
Coolant temperature sensor (B11/4) | – | – |
Charge air temperature sensor (B17/8) | – | – |
Pressure sensor downstream of air filter, left cylinder bank (B28/4) | – | – |
Pressure sensor downstream of air filter, right cylinder bank (B28/5) | – | – |
Pressure sensor upstream of throttle valve (B28/6) | – | – |
Pressure sensor downstream of throttle valve (B28/7) | – | – |
Accelerator pedal sensor (B37) | – | – |
Engine oil pressure sensor (B42) | – | – |
Crankshaft Hall sensor (B70) | – | – |
On-board electrical system battery (G1) | – | – |
Left oxygen sensor sensor element upstream of CAT (G3/3b1) | – | – |
– | Left oxygen sensor heater upstream of CAT (G3/3r1) | – |
Right oxygen sensor sensor element upstream of CAT (G3/4b1) | – | – |
– | Right oxygen sensor heater upstream of CAT (G3/4r1) | – |
Left oxygen sensor sensor element downstream of CAT (G3/5b1) | – | – |
– | Left oxygen sensor heater downstream of CAT (G3/5r1) | – |
Right oxygen sensor sensor element downstream of CAT (G3/6b1) | – | – |
– | Right oxygen sensor heater downstream of CAT (G3/6r1) | – |
– | Fan motor (M4/7) | – |
Actual value potentiometer 1 (M16/6r1), throttle valve | – | – |
Actual value potentiometer 2 (M16/6r2), throttle valve | – | – |
– | Actuator motor (M16/6m1), throttle valve | – |
Circuit 15 relay (N10/1kJ) | – | – |
– | Charge air cooler circulation pump relay (N10/2kD) | For engine 278 |
Supplemental Restraint System control unit (N2/10) | – | – |
Oil level check switch (S43) | – | – |
– | Charge air cooler circulation pump relay (K61) | With engine 157 |
– | Starter circuit 50 relay (N10/1kJ) | – |
– | Engine circuit 87 relay (N10/1kJ) | – |
– | Fuel system control unit (N118) | – |
– | Coolant thermostat heating element(R48) | – |
– | Cylinder 1 ignition coil (T1/1) | – |
– | Cylinder 2 ignition coil (T1/2) | – |
– | Cylinder 3 ignition coil (T1/3) | – |
– | Cylinder 4 ignition coil (T1/4) | – |
– | Cylinder 5 ignition coil (T1/5) | – |
– | Cylinder 6 ignition coil (T1/6) | – |
– | Cylinder 7 ignition coil (T1/7) | – |
– | Cylinder 8 ignition coil (T1/8) | – |
– | Left intake camshaft solenoid (Y49/4) | – |
– | Right intake camshaft solenoid (Y49/5) | – |
– | Left exhaust camshaft solenoid (Y49/6) | – |
– | Right exhaust camshaft solenoid (Y49/7) | – |
– | Purging switchover valve (Y58/1) | – |
– | Activated charcoal canister shutoff valve (Y58/4) | With CODE 494 (USA version) |
– | Cylinder 1 fuel injector (Y76/1) | – |
– | Cylinder 2 fuel injector (Y76/2) | – |
– | Cylinder 3 fuel injector (Y76/3) | – |
– | Cylinder 4 fuel injector (Y76/4) | – |
– | Cylinder 5 fuel injector (Y76/5) | – |
– | Cylinder 6 fuel injector (Y76/6) | – |
– | Cylinder 7 fuel injector (Y76/7) | – |
– | Cylinder 8 fuel injector (Y76/8) | – |
– | Boost pressure control pressure transducer (Y77/1) | – |
– | Left quantity control valve (Y94/1) | |
– | Right quantity control valve (Y94/2) | – |
– | Engine oil pump valve (Y130) | – |
Input and initial parameters from the following components and control units are sent or received by the ME-SFI [ME] control unit via the LIN or CAN and are needed by the engine management:
Input factors via the drive-LIN (LIN C1) | Initial parameters via the drive-LIN (LIN C1) | Supplemental information |
Alternator (G2) | – | – |
Oil sensor (oil level, temperature and quality) (B40) | – | With engine 157 |
Input factors via the drive train CAN (CAN C) | Initial parameter via the drive train CAN (CAN C) | Supplemental information |
Fuel system control unit (N118) | Fuel system control unit (N118) | – |
Fully integrated transmission control unit (Y3/8n4) | Fully integrated transmission control unit (Y3/8n4) | – |
Input factors via chassis CAN 1 (CAN E1) | Initial parameters via chassis CAN 1 (CAN E1) | Supplemental information |
Instrument cluster (A1) | Instrument cluster (A1) | Via chassis CAN 2 (CAN E2) and front SAM control unit with fuse and relay module (N10/1) |
Supplemental Restraint System control unit (N2/10) | – | – |
Rear SAM control unit with fuse and relay module (N10/2) | – | Via interior CAN (CAN B) and front SAM control unit with fuse and relay module (N10/1) |
AAC control and operating unit (N22/7) | – | Via interior CAN (CAN B) and front SAM control unit with fuse and relay module (N10/1) |
Electronic Stability Program control unit (N30/4) | – | – |
Active Body Control control unit (N51/2) (for code 487 (Active Body Control (ABC))) | – | – |
Radar sensors control unit (N62/1) as of model year 2017 (for code 23P (Driving Assistance package Plus)) | – | Via chassis-FlexRay (Flex E) and chassis gateway control unit (N93/7) (for code 23P (Driving assistance package)) |
Video and radar sensor system control unit (N62/2) up to model year 2017 (for code 233 (DISTRONIC PLUS)), (for code 237 (Active Blind Spot Assist)), (for code 238 (Active Lane Keeping Assist)) | – | – |
Left front door control unit (N69/1) | – | Via interior CAN (CAN B) and front SAM control unit with fuse and relay module (N10/1) |
Lower control panel control unit (N72/) | – | Via instrument panel LIN (LIN 1) and front SAM control unit with fuse and relay module (N10/1) |
Electronic ignition lock control unit (N73) | Electronic ignition lock control unit (N73) | – |
Steering column tube module control unit (N80) | – | – |
Diagnostic connector (X11/4) | Diagnostic connector (X11/4) | Via diagnostic CAN (CAN D) and front SAM control unit with fuse and relay module (N10/1) |
Body
The ME-SFI [ME] control unit housing is made out of diecast aluminum and the cover is made out corrosion-protected sheet steel. The ME-SFI [ME] control unit is water and dust protected.
The inside contains the 32-bit measuring and control electronics for the engine management.
Power supply
The ME-SFI [ME] control unit is supplied with a voltage from "circuit 30 secured" and also for ignition ON from "circuit 87 M4".
In the operating voltage range it has both short-circuit protection and reversed polarity protection.
Power is supplied through several engaged parallel pins connected in parallel to relieve the electrical connections.
Ground connection
The "circuit 31" ground connection is made via multiple ground lines to the right front longitudinal member ground point 2 (W52/2).
Variants
The variants of the engine management, for exampled country and exhaust variants, are activated with XD over the variant coding.
Exchange of the ME-SFI [ME] control unit is not necessary.