View of engine from the front above (shown on model 212) |
N3/10 | ME-SFI [ME] control unit |
P07.70-2394-76
Location
The ME-SFI [ME] control unit is located at the rear center of the engine.
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 assembly parts
The ME-SFI [ME] control unit also acts as an interface (Gateway) between the attached CAN bus systems.
Controlling the engine basic functions
Ignition ON
Start
Ignition OFF
Fuel supply
Injection control
Ignition system
Synchronization of injection and firing order
Start, post-start phase and warm-up enrichment
Rpm control
Alternator interface
Lambda control
Smooth running control
Thermal management
Torque coordination
Deceleration fuel shutoff
Knock control
Camshaft adjustment
Engine limp-home mode
European On-Board Diagnosis
ECO start/stop function
Charging
Exhaust treatment
Exhaust gas recirculation (with NOx storage catalytic converter) (with code 920 (Gasoline direct injection with stratified charge))
Electronic accelerator
Capturing fueling gases (for code 494 (USA version))
Purging
Purging with leak test (with code 494 (USA version))
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)
Drive train sensor CAN (CAN I) (for code 920 (Gasoline direct injection with stratified charge))
Evaluation of input factors
The input factors that have been read in are evaluated by the integrated microprocessor and the affected assembly parts are then actuated.
Output of signals and actuation of assembly parts
Initial parameter are output over the following connections:
Direct line
Drive train LIN
Drive train CAN
Chassis CAN 1
Drive train sensor CAN (for code 920 (Gasoline direct injection with stratified charge))
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 attached to the various CAN-bus systems.
Input factors and initial parameters for the following assembly parts are read in or output over direct lines by the ME-SFI [ME] control unit and are needed by the engine management:
Input factors over a direct line | Initial parameters over a direct line | Supplemental information |
Terminal 15 | – | – |
Circuit 30 (fused) | – | – |
Circuit 31 | – | – |
Circuit 87M4 | – | – |
RH knock sensor (A16/1) | – | – |
LH knock sensor (A16/2) | – | – |
– | Fuel tank diagnostic module pump (A101m1) | For model 218 with code 494 (USA version) and code 920 (Gasoline direct injection with stratified charge) as of model year 2017 |
– | Fuel tank diagnostic module heating element (A101r1) | For model 218 with code 494 (USA version) and code 920 (Gasoline direct injection with stratified charge) as of model year 2017 |
– | Fuel tank diagnostic module solenoid valve (A101y1) | For model 218 with code 494 (USA version) and code 920 (Gasoline direct injection with stratified charge) as of model year 2017 |
Fuel tank pressure sensor (B4/3) | – | For code 494 (USA version), except model 218 with code 920 (Gasoline direct injection with stratified charge) as of model year 2017 |
Purging pressure sensor (B4/4) | – | With CODE 494 (USA version) |
Fuel pressure and temperature sensor (B4/25) | – | – |
Exhaust gas recirculation pressure sensor 1 (B5/5) | – | For code 920 (Gasoline direct injection with stratified charge) |
Exhaust gas recirculation pressure sensor 2 (B5/6) | – | For code 920 (Gasoline direct injection with stratified charge) |
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 (model 207, 212), coolant temperature sensor (model 218) (B11/4) | – | – |
Temperature sensor upstream of the right NOx storage catalytic converter (B16) | – | For code 920 (Gasoline direct injection with stratified charge) |
Temperature sensor upstream of left NOx storage catalytic converter (B16/1) | – | For code 920 (Gasoline direct injection with stratified charge) |
Charge air temperature sensor (B17/8) | – | – |
Charge air temperature sensor downstream of throttle valve (B17/9) | – | For code 920 (Gasoline direct injection with stratified charge) |
Pressure sensor downstream of left cylinder bank air filter (B28/4) | – | – |
Pressure sensor downstream of air filter (B28/5) (for engine 276.8 in model 207, 212) | – | – |
Pressure sensor downstream of air filter, right cylinder bank (B28/5) (for engine 276.8 in model 218) | – | – |
Pressure sensor upstream of throttle valve (B28/6) | – | – |
Pressure sensor downstream of throttle valve (B28/7) | – | – |
Accelerator pedal sensor (B37) | – | – |
Crankshaft Hall sensor (B70) | – | – |
Left oxygen sensor upstream of catalytic converter (G3/3) | Left oxygen sensor upstream of catalytic converter (G3/3) | – |
Right oxygen sensor upstream of catalytic converter (G3/4) | Right oxygen sensor upstream of catalytic converter (G3/4) | – |
Left oxygen sensor downstream of catalytic converter (G3/5) | Left oxygen sensor downstream of catalytic converter (G3/5) | – |
Right oxygen sensor downstream of catalytic converter (G3/6), | Right oxygen sensor downstream of catalytic converter (G3/6), | – |
– | Coolant circulation pump relay (K60) | – |
Internal combustion engine fan motor and air conditioning with integrated control (M4/7) | Internal combustion engine fan motor and air conditioning with integrated control (M4/7) | – |
Throttle valve actuator (M16/6) | Throttle valve actuator (M16/6) | – |
Supplemental Restraint System control unit (N2/10) | – | – |
Circuit 15 relay (N10/1kJ) | – | – |
– | Starter circuit 50 relay (N10/1kJ) | – |
Engine circuit 87 relay (N10/1kJ) | Engine circuit 87 relay (N10/1kJ) | – |
– | Fuel system control unit (N118) | – |
– | Coolant thermostat heating element(R48) | – |
Oil level check switch (S43) | – | – |
– | 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) | – |
Left exhaust gas recirculation valve Hall sensor (Y27/11b1) | – | For code 920 (Gasoline direct injection with stratified charge) |
– | Left exhaust gas recirculation valve rotating solenoid (Y27/11y1) | For code 920 (Gasoline direct injection with stratified charge) |
Right exhaust gas recirculation valve Hall sensor (Y27/12b1) | – | For code 920 (Gasoline direct injection with stratified charge) |
– | Right exhaust gas recirculation valve rotating solenoid (Y27/12y1) | For code 920 (Gasoline direct injection with stratified charge) |
– | Boost pressure control pressure transducer (Y31/5) | – |
– | 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) | For code 494 (USA version), except model 218 with code 920 (Gasoline direct injection with stratified charge) as of model year 2017 |
– | 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) | – |
– | Quantity control valve (Y94) | |
– | Left thrust circulating air switchover valve (Y101/1) | – |
– | Right thrust circulating air switchover valve (Y101/2) | – |
– | Engine oil pump valve (Y130) | – |
Input parameters and initial parameters for the following assembly parts and control units are transmitted or received by the ME-SFI [ME] or CDI control unit via the LIN or CAN and are needed by the engine management system:
Input factors via the drive-LIN (LIN C1) | Initial parameters via the drive-LIN (LIN C1) | Supplemental information |
Alternator (G2) | Alternator (G2) | – |
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 controller unit (Y3/8) | Fully integrated transmission control controller unit (Y3/8) | – |
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) (except code 233 (DISTRONIC PLUS), Electronic Stability Program Premium control unit (N30/7) (for code 233 (DISTRONIC PLUS)) | – | – |
AIRmatic control unit (N51/3) (for model 212, 218 with code 489 (AIRMATIC)) | – | – |
Adaptive damping system control unit (N51/5) (model 207 with code 483 (ADVANCED AGILITY package)) | – | – |
Radar sensors control unit (N62/1) (for code 23P (Driving assistance package PLUS)) | – | Via chassis FlexRay (Flex E) and chassis gateway control unit (N93/7) |
Left front door control unit (N69/1) | – | Via interior CAN (CAN B) and front SAM control unit with fuse and relay module (N10/1) |
Upper control panel control unit (N72/1) | – | 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) | – | – |
Rear axle electronic level regulation control unit (N97) (model 212.2 except code 488 (Steel/air suspension) and except code 489 (AIRMATIC)) | – | – |
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) |
Input factors via drive train sensor CAN (CAN I) | Initial parameters via drive train sensor CAN (CAN I) | Supplemental information |
Control unit for left NOx sensor upstream of NOx storage catalytic converter (N37/9) | Control unit for left NOx sensor upstream of NOx storage catalytic converter (N37/9) | For code 920 (Gasoline direct injection with stratified charge) |
Control unit for right NOx sensor upstream of NOx storage catalytic converter (N37/10) | Control unit for right NOx sensor upstream of NOx storage catalytic converter (N37/10) | For code 920 (Gasoline direct injection with stratified charge) |
NOx sensor downstream of NOx storage catalytic converter (N37/11) | NOx sensor downstream of NOx storage catalytic converter (N37/11) | For code 920 (Gasoline direct injection with stratified charge) |
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 power from "circuit 30 secured" and also for ignition ON from "circuit 87 M4".
In the nominal operating voltage range there is 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 several ground lines to the left major assembly compartment electronics ground point (W16/5).
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.
Wiring diagram for gasoline-DI control unit | N3/10 Body side model 207 | ||
N3/10 Engine side model 207 | |||
N3/10 Vehicle connector model 212 | |||
N3/10 engine connector model 212, sheet 1 | |||
N3/10 Engine connector model 212, sheet 2 | |||
N3/10 engine connector model 218, sheet 1 | |||
N3/10 engine connector model 218, sheet 2 | |||
N3/10 vehicle connector model 218 |