Vehicle view from front left, shown on model 222.0 |
N3/10 | ME-SFI [ME] control unit |
P07.08-2334-76
Arrangement in engine 176.9
The ME-SFI [ME] control unit is mounted on the right rear in the engine compartment beneath a cover.
View of engine from top front |
N3/10 | ME-SFI [ME] control unit |
P01.10-3357-76
Location for engine 177.9
Control unit ME-SFI is located on the engine above the right cylinder bank.
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
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
Engine speed control
Alternator interface
Lambda control
Smooth running control
Heat management
Torque coordination
Inertia fuel shutoff
Knock sensor system
Camshaft adjustment
Engine limp-home mode
European On-Board Diagnosis
ECO start/stop function
Cylinder shutoff
Exhaust treatment
Charging
Electronic accelerator
Capturing fueling gases (with code 494 (USA version))
Purge control
Purge system with leak test (with code 494 (USA version))
Reading in of signals
Input and initial parameters are read in and output via the following connections:
Direct line
Drive-LIN (LIN C1)
Engine CAN (CAN C)
Drive train CAN (CAN C1)
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
Engine CAN
Drive train CAN
The electronic ignition lock control unit (N73) is the central interface (Gateway) for exchanging the function-relevant data of the control units that are connected 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 required by the engine management system:
Input factors over a direct line from | Output factors over a direct line to | Supplemental information |
Terminal 15 | | |
Circuit 30 (fused) | | |
Circuit 31 | | |
Circuit 87 (M4) | | |
Knock sensor 1 (A16/1) | | |
Knock sensor 2 (A16/2) | | |
Knock sensor 3 (A16/3) | | |
Knock sensor 4 (A16/4) | | |
| Fuel tank diagnostic module pump (A101m1) | With CODE 494 (USA version) |
| Fuel tank diagnostic module heating element (A101r1) | With CODE 494 (USA version) |
| Fuel tank diagnostic module solenoid valve (A101y1) | With CODE 494 (USA version) |
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) | | |
Left charge air temperature sensor (B17/14) | | |
Right charge air temperature sensor (B17/15) | | |
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 left throttle valve (B28/20) | | |
Pressure sensor upstream of right throttle valve (B28/21) | | |
Pressure sensor downstream of left throttle valve (B28/22) | | |
Pressure sensor downstream of right throttle valve (B28/23) | | |
Oil sensor (oil level, temperature and quality) (B40) | | |
Right fuel pressure and temperature sensor (B42/1) | | |
Left fuel pressure and temperature sensor (B42/2) | | |
Crankshaft Hall sensor (B70) | | |
Left purging pressure sensor (B108/1) | | With CODE 494 (USA version) |
Right purging pressure sensor (B108/2) | | With CODE 494 (USA version) |
Left oxygen sensor element upstream of CAT (G3/3b1) | | |
| Left oxygen sensor heater upstream of CAT (G3/3r1) | |
Right oxygen sensor element upstream of CAT (G3/4b1) | | |
| Right oxygen sensor heater upstream of CAT (G3/4r1) | |
Left oxygen sensor element downstream of CAT (G3/5b1) | | |
| Left oxygen sensor heater downstream of CAT (G3/5r1) | |
Right oxygen sensor element downstream of CAT (G3/6b1) | | |
| Right oxygen sensor heater downstream of CAT (G3/6r1) | |
Engine compartment circuit 15 relay (K40/8kG) | | |
| Starter circuit 50 relay (K40/8kH) | |
Circuit 87M relay (K40/8kN) | Circuit 87M relay (K40/8kN) | |
| Left and right throttle valve actuator motor (M16/60m1 and M16/61m1) | |
Actual value potentiometer 1, left (M16/60r1) | | |
Actual value potentiometer 1, right (M16/61r1) | | |
Actual value potentiometer 2, left (M16/60r2) | | |
Actual value potentiometer 2, right (M16/61r2) | | |
Supplemental Restraint System control unit (N2/10) | | |
| Fuel system control unit (N118) | |
| Coolant thermostat heating element(R48) | |
| Cylinder 1 ignition coil (T4t1) | |
| Cylinder 2 ignition coil (T4t2) | |
| Cylinder 3 ignition coil (T4/1t3) | |
| Cylinder 4 ignition coil (T4/1t4) | |
| Cylinder 5 ignition coil (T4/2t5) | |
| Cylinder 6 ignition coil (T4/2t6) | |
| Cylinder 7 ignition coil (T4/3t7) | |
| Cylinder 8 ignition coil (T4/3t8) | |
| Heating system shutoff valve (Y16/2) | |
| Left intake camshaft solenoid (Y49/4) | |
| Right intake camshaft solenoid (Y49/5) | |
| Left exhaust camshaft solenoid (Y49/6) | |
| Right exhaust camshaft solenoid (Y49/7) | |
| Cylinder 2 intake CAMTRONIC actuator (Y49/11) | |
| Cylinder 2 exhaust CAMTRONIC actuator (Y49/12) | |
| Cylinder 3 intake CAMTRONIC actuator (Y49/13) | |
| Cylinder 3 exhaust CAMTRONIC actuator (Y49/14) | |
| Cylinder 5 intake CAMTRONIC actuator (Y49/15) | |
| Cylinder 5 exhaust CAMTRONIC actuator (Y49/16) | |
| Cylinder 8 intake CAMTRONIC actuator (Y49/17) | |
| Cylinder 8 exhaust CAMTRONIC actuator (Y49/18) | |
| Left purging switchover valve (Y58/11) | |
| Right purging switchover valve (Y58/12) | |
| 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) | |
| Left thrust circulating air switchover valve (Y101/1) | |
| Right thrust circulating air switchover valve (Y101/2) | |
| Engine oil pump valve (Y130) | |
Left gasoline particulate filter differential pressure sensor (B163/5) | | Model 217, 222 with engine 177.9 and code 598 (Gasoline particulate filter (GPF) with sensor system) |
Right gasoline particulate filter differential pressure sensor (B163/6) | | Model 217, 222 with engine 177.9 and code 598 (Gasoline particulate filter (GPF) with sensor system) |
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) from | Output factors via the drive LIN (LIN C1) to | Supplemental information |
Alternator (G2) | | |
Input factors over engine CAN (CAN C) from | Initial parameters over engine CAN (CAN C) to | Supplemental information |
Instrument cluster (A1) | Instrument cluster (A1) | Via user interface-CAN (CAN HMI), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
Audio/COMAND control panel (A40/9) (with code 448 (Touchpad)) | Audio/COMAND control panel (A40/9) (with code 448 (Touchpad)) | Via the telematics CAN (CAN A), head unit (A26/17), user interface CAN (CAN HMI), electronic ignition lock control unit (N73), suspension FlexRay (Flex E), and powertrain control unit (N127) |
Supplemental Restraint System control unit (N2/10) | | Via user interface-CAN (CAN HMI), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
Front SAM control unit (N10/6) | | Over the interior CAN (CAN B), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
Electronic Stability Program control unit (N30/4) | | Via suspension FlexRay (Flex E) and powertrain control unit (N127) |
Mercedes-Benz Intelligent Drive control unit (N62/4) (with code 23P (Driving Assistance Package)) | | Via suspension FlexRay (Flex E), Electronic Stability Program control unit (N30/4) and powertrain control unit (N127) |
Left front door control unit (N69/1) | | Over the interior CAN (CAN B), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
Electronic ignition lock control unit (N73) | Electronic ignition lock control unit (N73) | Via suspension FlexRay (Flex E) and powertrain control unit (N127) |
Powertrain control unit (N127) | Powertrain control unit (N127) | |
Diagnostics connection (X11/4) | Diagnostics connection (X11/4) | Via diagnostic CAN (CAN D), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
Input factors via drive CAN (CAN C1) from | Output factors via drive CAN (CAN C1) to | Supplemental information |
Instrument cluster (A1) | Instrument cluster (A1) | Via user interface-CAN (CAN HMI), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
Climate control control unit (N22/1) | | Over the interior CAN (CAN B), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
Electronic Stability Program control unit (N30/4) | | Via suspension FlexRay (Flex E) and powertrain control unit (N127) |
Mercedes-Benz Intelligent Drive control unit (N62/4) (with code 23P (Driving Assistance Package)) | | Via suspension FlexRay (Flex E), Electronic Stability Program control unit (N30/4) and powertrain control unit (N127) |
Steering column tube module control unit (N80) | | Via suspension FlexRay (Flex E) and powertrain control unit (N127) |
Fuel system control unit (N118) | Fuel system control unit (N118) | |
Powertrain control unit (N127) | Powertrain control unit (N127) | |
Fully integrated transmission control unit (Y3/8n4) (for model 217/222) or electric controller unit control unit (for model 290) | Fully integrated transmission control unit (Y3/8n4) (for model 217/222) or electric controller unit control unit (for model 290) | |
Structure
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.
Voltage 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 control 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.
Variants
The engine management variants, such as country and exhaust variants, are activated with a vehicle diagnosis system via variant coding.
Exchange of the ME-SFI [ME] control unit is not necessary.
Wiring diagram for gasoline-DI control unit | Engine 176.9 in model 217, 222 as of model year 2018Vehicle side | ||
Engine 176.9 in model 217, 222 as of model year 2018Engine side | |||
Engine 177.9 in model 217, 222 as of model year 2018Vehicle side | |||
Engine 177.9 in model 217, 222 as of model year 2018Engine side |