View of engine |
N3/10 | ME-SFI [ME] control unit |
P07.08-2255-76
Location
The ME-SFI [ME] control unit is located at the front right in the engine compartment.
Tasks
The primary task of the ME-SFI [ME] control unit is electronic engine management with the goal of economic engine operation with low emissions. In doing so the ME-SFI [ME] control unit continuously detects the relevant influencing factors, processes these and determines respective control signals for the individual actuators. For example injection quantities, the injection period, charging and throttle valve position are controlled. For deviations from normal operation the respective information is stored in the fault memory.
The electronic engine management includes the control of the following functions:
Fuel supply
Ignition system
Injection quantity control
Heat management
Torque coordination (detection and implementation of corresponding requests)
Charging
Knock sensor system
Exhaust treatment
ECO start/stop function (with CODE MJ7 (ECO start/stop function))
Catching the fuelling gases (with code ZU8 (National version USA))
Purge control
Diagnosis and fault storage
The ME-SFI [ME] control unit is networked over the following bus systems with the vehicle electronics:
Drive-LIN (LIN C1)
Drive train CAN (CAN C)
For implementation of the electronic engine management the ME-SFI [ME] control unit underetakes the following tasks:
Reading in of sensors and signals
Evaluation of input factors
Actuation of components
Sending signals
Reading in of sensors and signals
Different sensors that detect the engine operating status are connected via direct lines to the ME-SFI [ME] control unit. These sensorss deliver current, voltage or resistance values out of which the ME-SFI [ME] control unit deduces the operating condition of the engine. To do this the following sensors are important:
Knock sensor 1 (A16/1)
Knock sensor 2 (A16/2)
Knock sensor 3 (A16/3)
Knock sensor 4 (A16/4)
Engine oil temperature sensor (B1)
Fuel tank pressure sensor (B4/3) (with code ZU8 (USA national 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)
Accelerator pedal sensor (B37)
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 oxygen sensor upstream of catalytic converter (G3/3)
Right oxygen sensor upstream of catalytic converter (G3/4)
Left oxygen sensor downstream of catalytic converter (G3/5)
Right oxygen sensor downstream of catalytic converter (G3/6),
Left throttle valve actuator (M16/60)
Right throttle valve actuator (M16/61)
Supplemental restraint system control unit (N2/10) (Crash income)
For implementation of the electronic engine management the ME-SFI [ME] control unit reads in a nunber of sources including the following signals over the various bus systems.
Signal contents | Transmitter | Connection |
Circuit 61 status | Alternator (G2) | Drive train LIN |
Alternator utilization | ||
Fault | ||
Fuel pressure | Fuel system control unit (N118) | Drive train CAN |
Fuel level | ||
Fuel temperature (with code ZU8 (USA version)) | ||
Fault | ||
Drive position | Fully integrated transmission control unit (Y3/8n4) | Drive train CAN |
Selector lever position | ||
Increase engine torque | ||
Reduce engine torque | ||
Increase engine torque | DISTRONIC electric controller unit (EZ9) (with code A89 DISTRONIC PLUS)) | Suspension CAN 1, powertrain control unit (N127), and drive CAN |
Reduce engine torque | ||
Crash signal | Supplemental Restraint System control unit (N2/10) | Chassis CAN 1, powertrain control unit and drive train CAN |
Driver seat belt buckle status | Chassis CAN 1, powertrain control unit and drive train CAN | |
Outside temperature | SAM control unit (N10) | Interior CAN (CAN B), electronic ignition lock control unit, chassis CAN 1, powertrain control unit and drive train CAN |
Engine hood contact switch, status | ||
Engine start request (with code MJ7 (ECO start/stop function)) | ||
Engine stop prohibition (with code MJ7 (ECO start/stop function)) | ||
A/C status | A/C control and operating unit (N22/7) | Interior CAN (CAN B), electronic ignition lock control unit, chassis CAN 1, powertrain control unit and drive train CAN |
Engine start request (with code MJ7 (ECO start/stop function)) | ||
Engine stop prohibition (with code MJ7 (ECO start/stop function)) | ||
Wheel speed | Electronic Stability Program control unit (N30/4) | Chassis CAN 1, powertrain control unit and drive train CAN |
Brake status | ||
ESP® status | ||
Engine start request (with code MJ7 (ECO start/stop function)) | ||
Engine stop prohibition (with code MJ7(ECO start/stop function)) | ||
Increase engine torque | Chassis CAN 1, powertrain control unit and drive train CAN | |
Reduce engine torque | ||
Driver door status | Left front door control unit (N69/1) | Interior CAN (CAN B), electronic ignition lock control unit, chassis CAN 1, powertrain control unit and drive train CAN |
Engine stop prohibition (with code MJ7 (ECO start/stop function)) | ||
Circuit status | Electronic ignition lock control unit (N73) | Chassis CAN 1, powertrain control unit and drive train CAN |
Steering wheel angle | Steering column tube module control unit (N80) | Chassis CAN 1, powertrain control unit and drive train CAN |
Steering wheel angular velocity |
Evaluation of input factors
The input factors that have been read in are evaluated by the integrated microprocessor and the relevant components are then actuated.
Actuation of components
The CDI control unit realizes the electronic engine management through actuation of various actuators which connected over direct lines:
Starter circuit 50 relay (F58kM)
Circuit relay87M (F58kN)
Circuit 15 relay (F58kR)
Left oxygen sensor upstream of catalytic converter
Right oxygen sensor upstream of catalytic converter
Left oxygen sensor downstream of catalytic converter
Right oxygen sensor downstream of catalytic converter
Fan motor (M4/7)
Left throttle valve actuator
Right throttle valve actuator
Coolant thermostat heating element(R48)
Cylinder ignition coil 1 + 2 (T4)
Ignition coil for cylinders 3 + 4 (T4/1)
Ignition coil for cylinders 5 + 6 (T4/2)
Cylinder ignition coil 7 + 8 (T43)
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)
Activated charcoal canister shutoff valve (Y58/4) (with code ZU8 (USA national version))
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)
Sending signals
The CDI control unit transmits, amongst other things, the following function-relevant requests and information via the bus systems to various components and systems in the vehicle.
Signal contents | Receiver | Connection |
Charging voltage | Alternator | Drive train LIN |
Engine running status | Fuel pump control unit | Drive train CAN |
Fuel pressure request | ||
Accelerator pedal position | ||
Fuel temperature | ||
Engine stop signal (with code MJ7 (ECO start/stop function)) | ||
Shift curve offset | Fully integrated transmission control control unit | Drive train CAN |
Brake status | ||
ESP® status | ||
Accelerator pedal position | ||
Engine running status | ||
Engine start/stop status (with code MJ7 (ECO start/stop function)) | ||
Indicator lamp request | Instrument cluster | Drive train CAN, powertrain control unit, chassis CAN 1, electronic ignition lock control unit and interior CAN |
Show message | ||
Alternator status | SAM control unit | Drive train CAN, powertrain control unit, chassis CAN 1, electronic ignition lock control unit and interior CAN |
Tank venting status | ||
Switch on air conditioning | Climate control control and operating unit | Drive train CAN, powertrain control unit, chassis CAN 1, electronic ignition lock control unit and interior CAN |
Engine speed | Electronic Stability Program control unit | Drive train CAN, powertrain control unit and chassis CAN 1 |
Accelerator pedal position | ||
Engine running status | ||
Current engine torque | ||
Engine running status | Steering column module control unit | Drive train CAN, powertrain control unit and chassis CAN 1 |
Accelerator pedal position | Drivetrain control unit | Drive train CAN |
Engine running status | ||
Engine torque, signal |
Variants
The variants of the engine management, for example country and exhaust variants, are activated with XENTRY Diagnostics over the variant coding.
Exchange of the ME-SFI [ME] control unit is not necessary.