View of engine compartment |
N3/10 | ME-SFI [ME] control unit |
P47.31-2174-76
Location
The ME-SFI [ME] control unit is located on the left of the engine next to the charge air distributor.
Task
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 operates in an electrical network of sensors and actuators to form the engine management system for engine 274 Hybrid. As the master control unit it also takes on a large part of the controlling of hybrid drive 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
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
Engine management Start-Stop
Hybrid drive system
Energy management for the hybrid drive system
Charging
Driving mode
Exhaust treatment
Electronic accelerator
Regenerative braking
Capturing fueling gases (for code 494 (USA version))
Purge control
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)
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 integral microprocessor, and the relevant assembly parts are 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 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 | – | – |
Knock sensor 1 (A16/1) | – | – |
Knock sensor 2 (A16/2) | – | – |
– | 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) |
Purging pressure sensor (B4/4) | – | With CODE 494 (USA version) |
Fuel pressure and temperature sensor (B4/25) | – | – |
Fuel tank pressure sensor 1 (B4/48) | – | With CODE 494 (USA version) |
Fuel tank pressure sensor 2 (B4/49) | – | With CODE 494 (USA version) |
Intake camshaft Hall sensor (B6/15) | – | – |
Exhaust camshaft Hall sensor (B6/16) | – | – |
Coolant temperature sensor (B11/4) | – | – |
Charge air temperature sensor upstream of throttle valve (B17/7) | – | – |
Charge air temperature sensor downstream of throttle valve (B17/9) | – | – |
Pressure sensor upstream of throttle valve (B28/6) | – | – |
Pressure sensor downstream of throttle valve (B28/7) | – | – |
Pressure sensor downstream of air filter (B28/11) | – | – |
Accelerator pedal sensor (B37) | – | – |
Crankshaft Hall sensor (B70) | – | – |
Oxygen sensor sensor element downstream of catalytic converter (G3/1b1) | – | – |
– | Oxygen sensor heater downstream of catalytic converter (G3/1r1) | – |
Oxygen sensor sensor element upstream of catalytic converter (G3/2b1) | – | – |
– | Oxygen sensor heater upstream of catalytic converter (G3/2r1) | – |
– | Throttle valve actuator motor (M16/6m1) | – |
Actual value potentiometer 1 (M16/6r1), throttle valve | – | – |
Actual value potentiometer 2 (M16/6r2), throttle valve | – | – |
– | Electric coolant pump (M75/11) | Except CODE 494 (USA version) |
Supplemental Restraint System control unit (N2/10) | – | – |
Engine compartment circuit 15 relay (K40/8kG) | – | – |
– | Starter circuit 50 relay (K40/8kH) | – |
Circuit 87M relay (K40/8kN) | Circuit 87M relay (K40/8kN) | – |
– | Fuel system control unit (N118) | – |
– | Wide open throttle operation vent line heater element (R39/2) | – |
– | 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) | – |
– | Heating system shutoff valve (Y16/2) | – |
– | Intake camshaft solenoid (Y49/1) | – |
– | Exhaust camshaft solenoid (Y49/2) | – |
– | Purging switchover valve (Y58/1) | – |
– | Partial load operation crankcase ventilation system valve (Y58/2) | – |
– | Fuel tank shutoff valve (Y58/5) | With CODE 494 (USA version) |
– | Fuel vapor shutoff valve (Y75/1) | 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) | – |
– | Boost pressure control pressure transducer (Y77/1) | – |
– | Quantity control valve (Y94) | – |
– | Deceleration air switchover valve (Y101) | – |
– | 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 |
Radiator sensor for engine diagnosis (B11/15) | Radiator sensor for engine diagnosis (B11/15) | for code 494 (USA version) and for code 917 (Partial zero emission vehicle emission USA) |
Input factors over engine CAN (CAN C) | Initial parameters via engine CAN (CAN C) | 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) |
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) |
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) |
Battery management system control unit (N82/2) | – | Via the HYBRID-CAN (CAN L) and over the powertrain control unit (N127) |
Powertrain control unit (N127) | Powertrain control unit (N127) | – |
Power electronics control unit (N129/1) | Power electronics control unit (N129/1) | Via the HYBRID-CAN (CAN L) and over the powertrain control unit (N127) |
Diagnostic connector (X11/4) | Diagnostic connector (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 train CAN (CAN C1) | Initial parameters via drive train CAN (CAN C1) | 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) |
Model 205: | – | Via suspension FlexRay (Flex E) and powertrain control unit (N127) |
Model 253: | – | Via suspension FlexRay (Flex E) and powertrain control unit (N127) |
Radar sensors control unit (N62/1) (with CODE 23P (Driving Assist 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) | Fully integrated transmission control unit (Y3/8n4) | – |
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.
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.