Component description for ME-SFI (ME) control unit - GF07.61-P-6000MFG
ENGINE 271.958 in MODEL 212.041 with CODE 924 (Bivalent natural gas drive)
View of engine from front left
Location
The ME-SFI [ME] control unit is located on the left on the air filter housing.
Task
The ME-SFI [ME] control unit forms the engine timing in electrical connection with the sensors and actuators for engine 271 KE CNG (K anal-E inspritzung C ompressed N atural G as).
The following systems and functions are controlled and coordinated by the ME-SFI [ME] control unit according to input signals:
- Ignition system
- Fuel supply
- Injection control
- Blowing in of gas
- Electronic accelerator
- Diagnosis and fault storage
- Drive authorization system and immobilizer
- Regulated camshaft adjustment
- Boost pressure control
- Thermal management
- Torque interface
- Alternator interface
- Exhaust treatment
Input and output signals
The following input signals are evaluated by the engine timing system and respective output signals are issued:
- Direct input signals
- Direct output signals
- CAN input signals
- CAN output signals
- LIN signals
Direct input signals
- Circuit 15
- Circuit 30 (fused)
- Circuit 31
- Circuit 87 M1
- Rear knock sensor (A16/1)
- Front knock sensor (A16/4)
- Hot film MAF sensor (B2/5)
- Intake camshaft Hall sensor (B6/15),
- Exhaust camshaft Hall sensor (B6/16)
- Coolant temperature sensor (B11/4)
- Charge air temperature sensor (B17/8)
- Pressure sensor (B28) (intake manifold air pressure)
- Accelerator pedal sensor (B37) - potentiometer 1
- Accelerator pedal sensor - potentiometer 2
- Oxygen sensor downstream of catalytic converter (G3/1)
- Oxygen sensor upstream of catalytic converter (G3/2)
- Crankshaft position sensor (L5)
- Circuit 15 relay (N10/1kJ)
- Throttle valve - actual value potentiometer 1 (M16/6r1)
- Throttle valve - actual value potentiometer 2 (M16/6r2)
- Boost pressure control flap - actual value potentiometer 1 (M16/7r1)
- Boost pressure control flap - actual value potentiometer 2 (M16/7r2)
- Crash signal from Supplemental Restraint System control unit (N2/10)
- Oil level check switch (S43)
Direct output signals
- Sensor voltages 1 and 2 (5 V) - engine connector
- Sensor voltages 1 and 2 (5 V) - vehicle connector
- Sensor grounds 1 and 2 - engine connector
- Sensor ground 1 - vehicle connector
- Accelerator pedal sensor - reference masses for potentiometer 1 and 2
- Oxygen sensor upstream of catalytic converter - oxygen sensor heater
- Oxygen sensor downstream of catalytic converter - oxygen sensor heater
- Fan motor for internal combustion engine and air conditioning system with integrated control (M4/7) - specified fan speed
- Throttle valve - actuator motor (M16/6m1) (plus)
- Throttle valve - actuator motor (M16/6m1) (minus)
- Boost pressure control flap - actuator motor (M16/7m1) (Plus)
- Boost pressure control flap - actuator motor (M16/7m1) (Minus)
- Circuit 50 relay, starter (N10/1kM)
- Engine circuit 87 relay (N10/1kN)
- FSCU (N118) - ground signal "fuel pump ON"
- Cylinder 1 ignition coil (T1/1)
- Cylinder 2 ignition coil (T1/2)
- Cylinder 3 ignition coil (T1/3)
- Cylinder 4 ignition coil (T1/4)
- Air pump switchover valve (Y32)
- Intake camshaft solenoid (Y49/1)
- Exhaust camshaft solenoid (Y49/2)
- Purging switchover valve (Y58/1)
- Actuation of injection valve for cylinder 1 (Y62/1) or gaseous fuel gas injection valve for cylinder 1 (Y106/1) over the CNG control unit (N118/2)
- Actuation of injection valve for cylinder 2 (Y62/2) or gaseous fuel gas injection valve for cylinder 2 (Y106/2) over the CNG control unit
- Actuation of injection valve for cylinder 3 (Y62/3) or gaseous fuel gas injection valve for cylinder 3 (Y106/3) over the CNG control unit
- Actuation of injection valve for cylinder 4 (Y62/4) or gaseous fuel gas injection valve for cylinder 4 (Y106/4) over the CNG control unit
- Radiator shutters actuator (Y84)
CAN input signals
Instrument cluster (A1)
- Fuel reserve signal
Supplemental restraint system control unit
- Crash signal
Electronic transmission control unit (N15/3)
- Gear range
- Transmission mode
- Actual gear engaged, target gear
- Engine torque request (reduction)
- Starter enable in selector lever position "P", "N"
- Engine idle specified speed (for actuation of the torque converter lockup clutch)
- Status of torque converter lockup clutch
- Limp-home mode operation transmission control
Automatic air conditioning control and operating unit (N22/7)
- Specified fan speed request
- Engine torque request
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)
- Wheel speed signal
- Brake recognition
- Cruise control request
- Vehicle speed
- Engine torque request
Video and radar sensor system control unit (N62/2) (for code (233) DISTRONIC PLUS, for code (237) Active Blind Spot Assist, for code (238) Active Lane Keeping Assist)
- Engine torque request (increase)
- Engine torque request (reduction)
Electronic ignition lock control unit (N73)
- Start enable (drive authorization system)
Steering column tube module control unit (N80)
- Cruise control request
Fuel system control unit (N118)
- Fuel pressure
- Self-diagnosis data
- Requested diagnostic data
CNG control unit
- Diagnostic data
- Injection adjustment
- Status of the gas system
- Gas cylinder fill level
- Exchange regarding vehicle operating mode (gasoline/gas)
CAN output signals
Instrument cluster
- Engine oil level too low
- Circuit 61 signal (generated by ME-SFI [ME] control unit)
- Fuel consumption (the trip computer is informed about the current fuel consumption by means of square-wave pulse packages (1 pulse = 0.2 l/h))
Electronic transmission control unit
Requests for catalytic converter heating
Switching request
- Engine torque
- Engine coolant temperature
- Engine speed
- Engine load
- Kickdown
- Engine speed limitation active
- Limp-home mode engine timing
Electronic ignition lock control unit
- Start enable query (drive authorization system)
Fuel system control unit
- Fuel pump ON
- Specified fuel pressure
- Diagnosis request
CNG control unit
- Diagnosis requests
- Engine load
- Engine speed
- Coolant temperature
- Exchange regarding vehicle operating mode (gasoline/gas)
LIN signals
- Alternator interface via the drive LIN (LIN C1)
Body
The housing of the ME-SFI [ME] control unit is made out of diecast 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.
Power supply
The ME-SFI [ME] control unit is "circuit 30 fused" and also supplied with a voltage for ignition ON by "circuit 87 M1".
In the operating voltage range it has both short-circuit protection and reversed polarity protection.
Power is supplied through several connectors connected in parallel to relieve the electrical connections.
Ground connection
The "circuit 31" ground connection is made via several ground lines from the left major assembly compartment electronics ground point (W16/5).
Computer power-down
If the ME-SFI [ME] control unit receives the signal "circuit 15 OFF", a processor run-on of approx. 5 seconds is started.
However, it may also last for several minutes due to various functions (for example, on-board diagnosis (OBD), drive authorization system (DAS), thermal management).
Assembly operations
Ensure before unplugging the plug on the ME-SFI [ME] control unit that the ignition is switched off and computer run-on has ended. This is to prevent damage to the ME-SFI [ME] control unit and save errors in the control units linked to the CAN.
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) | ||||
| Supply voltage | V | 13.5 | ||
| Voltage limit: Minimum Maximum | V | 5.5 | For t<100 ms | |
| V | 19.0 | |||
| Power consumption: No-load current operation, additional operation | mA | <0.1 | ||
| A | 6.0 | |||
| A | 11.5 | |||
| Reverse polarity protection | Yes | |||
| Short-circuit resistance | Yes | |||
| Additional specific parameters | No | |||
| Special features | No | |||
| Flash capability/coding capability | Yes/yes | |||
| Rear knock sensor (A16/1) Front knock sensor (A16/4) |
||||
| Model | Capacitive sensor (piezo crystal) | |||
| Capacitance | pF | 950 - 1350 | Sensor capacitance plus cable capacitance | |
| Sensitivity | mV/g | 26 | ±8 mV/g | |
| Resistor | MΩ | >10 | ||
| Linearity | kHz | 3 - 20 | ||
| Hot film mass air flow sensor (B2/5) | ||||
| Model | Hot film sensor | |||
| Supply voltage | V | 12 | Terminal 87 M2 | |
| Output voltage swing | V | 0.2 - 4.8 | In idle typically: about 1 V | |
| Intake camshaft Hall sensor (B6/15), exhaust camshaft Hall sensor (B6/16) | ||||
| Model | Hall sensor | |||
| Supply voltage | V | 4.7 - 18 | Circuit 87 M1.1 (B6/15) Circuit 87 M2.2 (B6/16) |
|
| Maximum power consumption | mA | <20 | ||
| Output signal: low high | V | ≤1.8 | ||
| V | ≥4.2 | |||
| Coolant temperature sensor (B11/4) | ||||
| Model | NTC resistor N egative T emperature C oefficient (NTC thermistor) | |||
| Series resistor | kΩ | 1.4 | ±1% | For V = 3.3 V |
| Resistance: 20°C | Ω | 3107 | ||
| 40°C | Ω | 1336 | ||
| 60°C | Ω | 630 | ||
| 80°C | Ω | 321 | ||
| 100°C | Ω | 175 | ||
| Signal plausibility | V | 0.10 - 3.25 | ||
| Special features | Arbitrary polarity | |||
| Charge air temperature sensor (B17/8) | ||||
| Model | NTC resistor | |||
| Resistance: -20°C | Ω | 48242 | ||
| 0°C | Ω | 16091 | ||
| 20°C | Ω | 6098 | ||
| 40°C | Ω | 2592 | ||
| 60°C | Ω | 1217 | ||
| Signal plausibility | V | 0.10 - 3.25 | ||
| Special features | Arbitrary polarity | |||
| Pressure sensor (intake manifold air pressure) (B28) | ||||
| Model | Pressure sensor | |||
| Supply voltage | V | 5.0 | ||
| Output voltage | V | 0.47 - 4.73 | ||
| Maximum power consumption | mA | 10 | ||
| Maximum operating pressure (absolute) | bar | 3.5 | ||
| Pressure measuring range (absolute) | bar | 0.2 - 2.5 | ||
| Accelerator pedal sensor (B37) | ||||
| Model | 2 Hall sensors | |||
| Supply voltage | V | 5.0 | ||
| Special features | Direct contacting over 6-terminal. AMP plug | |||
| Alternator (G2) | ||||
| Model | A/C alternator with integral rectification | |||
| Electrical output | W | |||
| Maximum transfer rate | kbit/s | 19.2 | Communication with ME-SFI control unit over drive LIN (LIN C1) | |
| Special features | Self-diagnosis | |||
| Oxygen sensor downstream of catalytic converter (G3/1) | ||||
| Model | Narrow band oxygen sensor (LSF 4.71) | |||
| Supply voltage | V | 12 | Terminal 87 M2 | |
| Internal resistance | Ω | 200 - 250 | ||
| Average pump current | μA | 20 - 25 | ||
| Maximum pump current | μA | 800 | ||
| Pump cycle duration | ms | 400 | ||
| Sensor voltage for: T = 350°C λ = 0.97 | mV | >800 | Dependent on exhaust temperature (T) | |
| T = 350°C λ = 1.03 | mV | 100 - 200 | ||
| Sensor voltage for: T = 850°C λ = 0.97 | mV | >680 | Dependent on exhaust temperature (T) | |
| T = 850°C λ = 1.03 | mV | 40 - 100 | ||
| Medium heating current | mA | approx. 400 | During idle | |
| Special features | Potential-free insulated sensor with 4-way connector | |||
| Oxygen sensor upstream of catalytic converter (G3/2) | ||||
| Model | Wide-band oxygen sensor (LSU 4.9) | |||
| Supply voltage | V | 12 | Terminal 87 M2 | |
| Average pump current | μA | 20 - 25 | ||
| Maximum pump current | μA | 800 | ||
| Pump cycle duration | ms | 400 | ||
| Internal resistance | Ω | 100 | ||
| Nernst voltage | mV | 450 | ||
| Medium heating current | mA | 400 | During idle | |
| Special features | Potential-free insulated sensor with 6-way connector | |||
| Crankshaft position sensor (L5) | ||||
| Model | Inductive sensor | |||
| Resistor | Ω | 680 | ±10% | |
| Inductance | mH | 560 | ±10% | |
| Distance to increment wheel | mm | 0.8 | ±0.5 mm | |
| Special features | Arbitrary polarity | |||
| Internal 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 | |
| Specified speed of the fan | over a pulse width modulated signal (PWM signal) from the ME-SFI [ME] control unit | |||
| Frequency of the PWM signal | Hz | 10 | ||
| Duty cycle of the PWM signal | % | 10 - 90 | ||
| High level | V | >8.4 | ||
| Low level | V | < 1.5 | ||
| Throttle valve actuator (M16/6) | ||||
| Model | DC actuator motor with transmission and position feedback | |||
| Supply voltage of the actuator motor | V | 12.0 | ||
| Typical power consumption of the actuator motor | A | 0.5 | Mean value | |
| A | 2.5 | Peak value | ||
| A | 5.0 | Reversing operation | ||
| Supply voltage for potentiometer | V | 5.0 | ||
| Resistance of the potentiometer | kΩ | 1.25 | ±20% | Bulk resistance |
| Resistance of the potentiometer | Ω | 300 | ±20% | Sliding series resistance |
| Manual end stops for potentiometer 1: | % | 10 | ±4% | |
| Lower Upper |
% | 93 | ±4% | |
| Manual end stops for potentiometer 2: | % | 90 | ±4% | |
| Lower Upper |
% | 7 | ±4% | |
| Diameter of throttle valve | mm | 57 | ||
| Special features | Opposing potentiometer | |||
| Boost pressure control flap actuator (M16/7) | ||||
| Model | DC actuator motor with transmission and position feedback | |||
| Supply voltage of the actuator motor | V | 12.0 | ||
| Typical power consumption of the actuator motor | A | 0.5 | Mean value | |
| A | 2.5 | Peak value | ||
| A | 5.0 | Reversing operation | ||
| Supply voltage for potentiometer | V | 5.0 | ||
| Resistance of the potentiometer | kΩ | 1.25 | ±20% | Bulk resistance |
| Resistance of the potentiometer | Ω | 300 | ±20% | Sliding series resistance |
| Diameter of the boost pressure control flap | mm | |||
| Special features | Opposing potentiometer | |||
| Oil level check switch (S43) | ||||
| Model | Reed contact (normally closed contact) | |||
| Resistor | Ω | ∞ | Oil level OK | |
| Ω | 0 | Minimum oil level not reached | ||
| Output signal: low high | V | ≤1.8 | ||
| V | ≥4.2 | |||
| Special features | 2-pin micro-Quadlok connector | |||
| Ignition coils for cylinder 1 to 4 (T1/1 - T1/4) | ||||
| Model | Single-spark ignition coil | |||
| Supply voltage | V | 12 | Terminal 87 M1.1 | |
| Maximum primary current | A | 10.5 | ||
| Resistance: Primary | Ω | 0.45 | at 20°C | |
| secondary | Ω | - | Secondary not measurable due to the diode | |
| Inductance: Primary | mH | approx. 20 | at 20°C | |
| secondary | mH | - | Secondary not measurable due to the diode | |
| Clip voltage | V | 400 | Typical | |
| Maximum secondary voltage | kV | ≤30 | For 20°C and a loading of C=30 pF/1 MΩ | |
| Reverse polarity protection | Yes | |||
| Short-circuit resistance | Yes | |||
| Air pump switchover valve (Y32) | ||||
| Model | Electrical switchover valve | |||
| Supply voltage | V | 12 | Terminal 87 M2.2 | |
| Coil resistance | Ω | 28.1 | ±5% | at 20°C |
| Intake camshaft solenoid (Y49/1), Exhaust camshaft solenoid (Y49/2) |
||||
| Model | Solenoid | |||
| Supply voltage | V | 12 | Terminal 87 M2 | |
| Coil resistance | Ω | >4.27 | +1 Ω | at 20°C |
| Duty cycle of the PWM signal | % | from ME-SFI [ME] control unit | ||
| Duty cycle | % | 100 | ||
| Purging switchover valve (Y58/1) | ||||
| Model | Solenoid valve | |||
| Supply voltage | V | 12 | Terminal 87 M2 | |
| Actuation | % | 0 - 100 | PWM signal | |
| PWM carrier frequency | Hz | 10.0 | ||
| Coil resistance | Ω | >26 | ±7% | at 23 °C |
| Injection valves for cylinders 1 to 4 (Y62/1 - Y62/4) | ||||
| Model | Solenoid valve | |||
| Supply voltage | Terminal 87 M1 | |||
| Coil resistance | Ω | approx. 14.5 | at 20°C | |
| Radiator shutters actuator (Y84) | ||||
| Model | Solenoid valve | |||
| Supply voltage | V | 12 | Terminal 87 M2 | |
| Operating voltage | V | |||
| Resistor | Ω | 300 | ||
| Inductance | mH | |||
| Gas injection valve gas for cylinder 1 - 4 (Y106/1 - 4) | ||||
| Model | Solenoid valve | |||
| Switch-on current limited to | A | 4 | ||
| Permanent current | A | 2 | ||
| Supply voltage | V | 12 | Terminal 87 M1 |
| Wiring diagram for ME-SFI [ME] gasoline injection and ignition system control unit | N3/10 Engine connector | PE07.61-P-2101-97DAF | |
| N3/10 Vehicle plug | PE07.61-P-2101-97DAG |