ENGINE | 274.9 in MODEL 212 |
with CODE 924 (Bivalent natural gas drive) |
Phantom view |
N3/10 | ME-SFI [ME] control unit |
P07.54-2131-82
Location
The ME-SFI [ME] control unit is located on the left on engine.
Task
The ME-SFI control unit fulfills the following tasks:
Controlling the basic engine functions
Reading in of sensors and signals
Evaluation of input factors
Output of signals and actuation of components
The ME-SFI [ME] control unit also acts as the interface (gateway) between the connected CAN bus systems.
Controlling the basic engine functions
– exhaust gas cleaning
– diagnosis and fault storage
– electronic accelerator
– drive authorization system and immobilizer
- blowing in of gas
– alternator interface
– regulated camshaft adjustment
– High pressure gasoline injection
– fuel supply
– boost pressure control
– torque interface
– engine timing start/stop function
– thermal management
– ignition system
Reading in of sensors and signals
Input factors are read in by means of the following connections:
– direct line
– drive train LIN (LIN C1)
– drive train CAN (CAN C)
– chassis CAN 1 (CAN E1)
– drive train sensor CAN (CAN I)
Evaluation of input factors
The input factors that have been read in are evaluated by the integral microprocessor, and the relevant components are 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
– drive train sensor CAN
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 needed by the engine timing:
Input factors over the direct line | Initial parameters over the direct line | Supplemental information |
Circuit 15 | – | – |
Circuit 30 (fused) | – | – |
Circuit 31 | – | – |
Circuit 87 M4 | – | – |
Rear knock sensor (A161) | – | – |
Front knock sensor (A16/4) | – | – |
Fuel pressure and temperature sensor (B4/25) | – | – |
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 downstream of air filter (B28/5) | – | – |
Pressure sensor upstream of throttle valve (B28/6) | – | – |
Pressure sensor downstream of throttle valve (B28/7) | – | – |
Accelerator pedal sensor (B37) | – | – |
Brake vacuum sensor (B64/1) | – | – |
Crankshaft Hall sensor (B70) (with rotational direction recognition) | – | – |
Transmission neutral position sensor (B79/2) | – | with manual transmission |
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) | – |
Combustion engine fan motor and air conditioning with integrated control (M4/7) | Combustion engine fan motor and air conditioning with integrated control (M4/7) | – |
– | Actuator motor (M16/6m1), throttle valve | – |
Actual value potentiometer 1 (M16/6r1), throttle valve | – | – |
Actual value potentiometer 2 (M16/6r2), throttle valve | – | – |
Supplemental restraint system control unit (N2/10) | – | – |
Circuit 15 relay (N10/1kJ) | – | – |
– | Circuit 50 starter relay (N10/1kM) | – |
– | Engine circuit 87 relay (N10/1kN) | – |
– | Fuel system control unit (N118) | – |
– | CNG control unit (N118/2) | – |
– | 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) | – |
– | Boost pressure control pressure transducer (Y31/5) | – |
– | Intake camshaft solenoid (Y49/1) | – |
– | Exhaust camshaft solenoid (Y49/2) | – |
– | Purging switchover valve (Y58/1) | – |
– | Partial load operation crankcase ventilation system valve (Y58/2) | – |
– | Cylinder 1 fuel injector (Y76/1) | – |
– | Cylinder 2 fuel injector (Y76/2) | – |
– | Cylinder 3 fuel injector (Y76/3) | – |
– | Cylinder 4 fuel injector (Y76/4) | – |
– | Radiator shutters actuator (Y84) | |
– | Quantity control valve (Y94) | – |
– | Deceleration air switchover valve (Y101) | – |
– | Gas injection valve gas for cylinder 1 (Y106/1) | Actuation over CNG control unit (N118/2) |
– | Gas injection valve gas for cylinder 2 (Y106/2) | Actuation over CNG control unit (N118/2) |
– | Gas injection valve gas for cylinder 3 (Y106/3) | Actuation over CNG control unit (N118/2) |
– | Gas injection valve gas for cylinder 4 (Y106/4) | Actuation over CNG control unit (N118/2) |
– | Engine oil pump valve (Y130) | – |
– | Coolant pump switchover valve (Y133) | – |
Input factors and initial parameters for the following components and control units are transmitted or received over the LIN or CAN by the ME-SFI [ME] control unit and are required by the engine timing:
Input factors via the drive train LIN (LIN C1) | Initial parameters via the drive train LIN (LIN C1) | Supplemental information |
Alternator (G2) | Alternator (G2) | – |
Input factors via drive train CAN (CAN C) | Initial parameters via drive train CAN (CAN C) | Supplemental information |
Fully integrated transmission control unit (Y3/8n4) | Fully integrated transmission control unit (Y3/8n4) | – |
Fuel system control unit (N118) | Fuel system control unit (N118) | – |
Input factors via | Output factors via | 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) |
Automatic air conditioning 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) or Electronic Stability Program Premium control unit (N30/7) (for code (233) DISTRONIC PLUS) | – | – |
Radar sensors control unit (N62/1) (with code (23P) Driving assistance package) | – | 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) | – | – |
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 |
CNG control unit (N118/2) | CNG control unit (N118/2) |
Body
The housing of the ME-SFI [ME] control unit is made out of die-cast aluminum and the cover is made out of corrosion-proof sheet steel. The ME-SFI [ME] control unit is protected against water and dust.
The housing contains the 32-bit measuring and control electronics for the engine timing.
Voltage supply
The ME-SFI [ME] control unit is "circuit 30 fused" and also supplied with a voltage for ignition ON by "circuit 87 M4".
In the operating voltage range it has both short-circuit protection and reversed polarity protection.
Power is supplied through several 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).
Information for partial function "no-load current shutoff" is documented in the function description "Engine OFF energy management function".
Variants
The engine timing variants (e.g. national and exhaust variants) are activated with Xentry Diagnostics using the variant coding function. Replacement of the ME-SFI [ME] control unit is not necessary.
Designation | Unit | Values | Tolerance range | Remarks |
ME-SFI [ME] control unit (N3/10) | ||||
Voltage supply | V | 12.0 | ||
Reverse polarity protection | Yes | |||
Additional specific parameters | No | |||
Flash capability/coding capability | Yes/yes | |||
Special features | No | |||
Rear knock sensor (A16/1) | ||||
Model | Capacitive sensor (piezo crystal) | |||
Capacitance | pF | 1050 | 250 | |
Resistor | MΩ | >10 | ||
Fuel pressure and temperature sensor (B4/25) | ||||
Model | Combined pressure and temperature sensor | |||
Supply voltage | V | 5.0 | 5% | |
Power consumption | mA | 12 |
| |
Pressure measuring range | MPa | 0 - 28 | ||
Operating pressure | MPa | 34 | Maximum | |
Bursting pressure | MPa | 260 | ||
Temperature measurement range | °C | –40 - 140 | ||
Resistor | kΩ | 10 | at 25°C | |
Special features | 4-pin connector | |||
Intake camshaft Hall sensor (B6/15), | ||||
Model | Hall sensor | |||
Supply voltage | V | 4.7 - 18 | ||
Maximum power consumption | mA | <20 | ||
Distance to sensor | mm | 0.2 - 1.8 | ||
Coolant temperature sensor (B11/4) | ||||
Type | NTC resistor Negative Temperature Coefficient (NTC thermistor) | |||
Signal plausibility | V | 0.1 - 4.9 | ||
Series resistor | Ω | 1470 | 1% | |
Resistance at: 20°C | Ω | 3117 | ||
Special features | Arbitrary polarity | |||
Charge air temperature sensor upstream of throttle valve(B17/7), | ||||
Model | NTC resistor | |||
Supply voltage | V | 5.0 | ||
Special features | Arbitrary polarity | |||
Pressure sensor downstream of air filter (B28/5) | ||||
Model | Pressure sensor | |||
Supply voltage | V | 5.0 | ||
Pressure sensor upstream of throttle valve (B28/6) | ||||
Type | Pressure sensor | |||
Supply voltage | V | 5.0 | ||
Pressure sensor downstream of throttle valve (B28/7) | ||||
Model | Pressure sensor | |||
Supply voltage | V | 5.0 | ||
Accelerator pedal sensor (B37) | ||||
Type | 2 Hall sensors | |||
Supply voltage | V | 5.0 | 0.3 V | |
Power consumption | mA | 9 | Typical | |
Special features | Direct contacting over | |||
Crankshaft Hall sensor (B70) | ||||
Model | Hall sensor | |||
Supply voltage | V | 5.0 | ||
Special features | Depending in the direction of rotation | |||
Alternator (G2) | ||||
Model | A/C alternator with integral rectification | |||
Interface transfer rate: Maximum | kbit/s | 19.2 | Communication with the ME-SFI [ME] control unit via the LIN bus | |
Special features | Self-diagnosis | |||
Oxygen sensor downstream of catalytic converter (G3/1) consisting of: | ||||
Model | Narrow band oxygen sensor (LSF 4.71) | |||
Supply voltage | V | 12 | Terminal 87 M2 | |
Medium heating current | mA | 400 | During idle | |
Internal resistance | Ω | 200 - 250 | ||
Pump current | μA | 20 - 25 | Center value | |
Pump cycle duration | ms | 400 | ||
Sensor voltage for: T = 350°C λ = 0.97 | mV | >800 | Dependent on exhaust temperature (T) | |
Sensor voltage for: T = 850°C λ = 0.97 | mV | >680 | Dependent on exhaust temperature (T) | |
Special features | Potential-free insulated sensor with 4-way connector | |||
Oxygen sensor upstream of catalytic converter (G3/2) consisting of: | ||||
Model | Wideband oxygen sensor | |||
Supply voltage | V | 12 | Terminal 87 M2 | |
Medium heating current | mA | 400 | During idle | |
Internal resistance | Ω | 100 | ||
Pump current | μA | 20 - 25 | Center value | |
Pump cycle duration | ms | 400 | ||
Nernst voltage | mV | 450 | ||
Special features | Potential-free insulated sensor with 6-way connector | |||
Combustion engine fan motor and air conditioning with integrated control (M4/7) | ||||
Model | Electric suction fan | |||
Supply voltage | V | 12 | Circuit 87 M2 and circuit 30 | |
Frequency | Hz | 10 | Pulse width modulated signal (PWM signal) | |
Actuation | % | 10 - 90 | PWM signal | |
Specified speed of the fan | Via a PWM signal from the ME-SFI [ME] control unit | |||
Throttle valve actuator (M16/6) consisting of: | ||||
Model | Actuator motor with a contact-less angular sensor | |||
Supply voltage of the actuator motor | V | 12.0 | ||
Actuator motor power consumption | A | 1.5 - 9.5 | ||
Special features | Reverse motion actual value potentiometer | |||
Wide open throttle operation vent line heater element (R39/2) | ||||
Model | Heating element | |||
Rated voltage | V | 12 | Terminal 87 M2 | |
Series resistor | Ω | 10 | at 25°C | |
Coolant thermostat heating element (R48) | ||||
Model | Heating element | |||
Supply voltage | V | 12 | Terminal 87 M2 | |
Operating current | A | <1.9 | ||
Resistor | Ω | 9.5 | 1 Ω | at 25°C |
Frequency | Hz | 141 | ||
Oil level check switch (S43) | ||||
Model | Reed contact (normally closed contact) | |||
Resistor | Ω | | Oil level OK | |
Special features | 2-pin micro-Quadlok connector | |||
Ignition coils for cylinder 1 - 4 (T1/1 - T1/4) | ||||
Model | Single-spark ignition coil | |||
Supply voltage | V | 12 | ||
Secondary voltage | V | 35.000 | ||
Primary current | A | 21 | Charging current | |
Primary resistance | Ω | 0.064 | ||
Secondary resistance | Ω | 2.25 | ||
Primary inductivity | μH | 289 | ||
Secondary inductivity | H | 5.84 | ||
Special features | Capacitive pick up for diagnosis | |||
Intake camshaft solenoid (Y49/1), | ||||
Model | Magnet | |||
Supply voltage | V | 12 | Terminal 87 M3 | |
Operating voltage | V | 10 - 16 | ||
Maximum power consumption | A | <3.0 | ||
Coil resistance | Ω | 7.6 | 10% | |
Frequency | Hz | 150 | PWM signal | |
Actuation | % | 5 - 95 | PWM signal | |
Ambient temperatures | °C | –40 - 155 | ||
Purging switchover valve (Y58/1) | ||||
Model | Solenoid valve | |||
Supply voltage | V | 12 | Terminal 87 M2 | |
Operating voltage | V | 9 - 16 | ||
Frequency | Hz | 200 | PWM signal | |
Coil resistance | Ω | 14.2 | ||
Partial-load range crankcase ventilation system valve (Y58/2) | ||||
Model | Solenoid valve | |||
Supply voltage | V | 12 | ||
Operating voltage | V | 10 - 16 | ||
Coil resistance | Ω | 32 | 1.6 | |
Maximum flow | l/min | 30 | ||
Working area | bar | –0.9 - 2 | ||
Fuel injectors for cylinder 1 to 4 (Y76/1 - Y76/4) | ||||
Model | Piezo injectors | |||
Resistor | kΩ | 220 | 10 kΩ | |
Special features | 2-pin connector: | |||
Boost pressure control pressure transducer (Y31/5) | ||||
Type | Solenoid valve | |||
Supply voltage | V | 12 | Terminal 87 M2 | |
Duty cycle | % | 100 | ||
Duty cycle | % | 5 - 95 | For 10 V | |
Operating frequency | Hz | 300 | PWM signal | |
Coil resistance | Ω | 10.5 | 0.7 | |
Air consumption | l/h | <35 | ||
Radiator shutters actuator (Y84) | ||||
Model | Electrical switchover valve | |||
Supply voltage | V | 12 | Terminal 87 M2 | |
Quantity control valve (Y94) | ||||
Type | ||||
Power consumption | A | approx. 14 | Maximum at 20°C | |
Effective current | A | < 5 | Maximum at 20°C | |
Coil resistance | Ω | 0.49 | 5% | at 20°C |
Frequency | kHz | 4 | PWM signal | |
Actuation | % | 10 - 90 | PWM signal | |
Deceleration air switchover valve (Y101) | ||||
Model | Solenoid valve | |||
Supply voltage | V | 12 | Terminal 87 M2 | |
Operating voltage | V | 10 - 16 | ||
Maximum power consumption | A | 2.36 | 0.06 A | |
Total resistance | Ω | 8.9 | 0.25 Ω | at 25°C |
Engine oil pump valve (Y130) | ||||
Model | Solenoid valve | |||
Supply voltage | V | 12 | Terminal 87 M2 | |
Frequency | Hz | 200 | PWM signal | |
Coolant pump switchover valve (Y133) | ||||
Model | Solenoid valve | |||
Supply voltage | V | 12 | Terminal 87 M2 |