GF07.61-P-6000MEH Component Description For ME-SFI [ME] Control Unit
GF07.61-P-6000MEH Component Description For ME-SFI [ME] Control Unit
- ENGINE 272.974 in MODEL 221.095 /195
Front view of engine compartment
N3/10 ME-SFI [ME] control unit
Location
The ME-SFI [ME] control unit is located in the middle on the variable intake manifold.
Task
The ME-SFI [ME] control unit creates the engine control in electrical connection with the sensors and actors of engine 272 KE Hybrid. As the master control unit it also takes on a large part of the controlling of hybrid drive systems.
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
- Electronic accelerator
- Diagnosis and fault storage
- Drive authorization system and immobilizer
- Regulated camshaft adjustment
- Intake manifold changeover
- Heat management
- Alternator interface
- Emission control
- Energy management and recuperation
- Torque coordination
- Automatic engine start/stop
- Cooling system for high voltage components
The ME-SFI [ME] control unit exchanges data to do this via the attached drive-CAN (CAN C), chassis CAN (CAN E) and drive train sensor CAN (CAN I) with other control units which are integrated in the CAN network.
The ME-SFI [ME] control unit also acts as the interface (gateway) between the three CAN bus systems.
Input and output signals
The following input signals are evaluated by the engine control and issued in the respective output signals:
- Direct input signals
- Direct output signals
- LIN signals
- CAN input signals
- CAN output signals
Direct input signals
- Circuit 15
- Circuit 30 (fused)
- Circuit 31
- Circuit 87M1
- Knock sensor 1, on the right (A16/1)
- Knock sensor 2, on the left (A16/2)
- Diagnostic module for tank leakage (A101) (for code (494) USA version)
- Hot film mass air flow sensor ()B2/5
- Intake air temperature sensor (B2/5b1)
- LH intake camshaft Hall sensor (B6/4)
- Right intake camshaft Hall sensor (B6/5)
- Left exhaust camshaft Hall sensor (B6/6)
- RH exhaust camshaft Hall sensor (B6/7)
- Low-temperature circuit temperature sensor (B10/13)
- Coolant temperature sensor (B11/4)
- Pressure sensor (B28) (intake manifold air pressure)
- Accelerator pedal sensor (B37) - potentiometer 1
- Accelerator pedal sensor - potentiometer 2
- Crankshaft Hall sensor (B70)
- Left O2 sensor, upstream of the catalytic converter (G3/3) (wideband oxygen sensor)
- Right O2 sensor, upstream of the catalytic converter (G3/4) (wideband oxygen sensor)
- LH O2 sensor downstream of the catalytic converter (G3/5) (non-linear oxygen sensor)
- RH O2 sensor downstream of catalytic converter (G3/6) (non-linear oxygen sensor)
- Throttle valve - actual value potentiometer 1 (M16/6r1)
- Throttle valve - actual value potentiometer 2 (M16/6r2)
- Crash signal from the restraint system control unit (N2/7)
- Oil level check switch (S43)
- Hybrid engine hood contact switch (S62/51)
Direct output signals
- Sensor voltages 1 and 2 (5 V) - engine plug
- Sensor voltages 1 and 2 (5 V) - vehicle plug
- Sensor grounds 1 and 2 - engine plug
- Sensor grounds 1 and 2 - vehicle plug
- Diagnostic module for tank leakage (for code (494) USA version)
- Accelerator pedal sensor - reference ground for potentiometer 1
- Accelerator pedal sensor - reference ground for potentiometer 2
- LH O2 sensor upstream of catalytic converter - oxygen sensor heater
- RH O2 sensor upstream of catalytic converter - oxygen sensor heater
- LH O2 sensor downstream of catalytic converter - oxygen sensor heater
- RH O2 sensor downstream of catalytic converter - oxygen sensor heater
- Engine and air conditioning electric suction fan with integrated control (M4/7) - specified speed of the fan
- Throttle valve - actuator motor (M16/6m1) +
- Throttle valve - actuator motor (M16/6m1) -
- Terminal 87 relay, engine (N10/1kC)
- Air pump relay (N10/1kA)
- Power electronics circulation pump relay 2 (K108/1)
- Fuel pump control unit (N118) - 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)
- Cylinder 5 ignition coil (T1/5)
- Cylinder 6 ignition coil (T1/6)
- Heating system shutoff valve (Y16/2)
- Variable intake manifold changeover valve (Y22/6)
- Air pump switchover valve (Y32)
- Left intake camshaft solenoid (Y49/4)
- Right intake camshaft solenoid (Y49/5)
- Left exhaust camshaft solenoid (Y49/6)
- Right exhaust camshaft solenoid (Y49/7)
- Purge control valve (Y58/1)
- Cylinder 1 fuel injection valve (Y62y1)
- Cylinder 2 fuel injection valve (Y62y2)
- Cylinder 3 fuel injection valve (Y62y3)
- Cylinder 4 fuel injection valve (Y62y4)
- Cylinder 5 fuel injection valve (Y62y5)
- Cylinder 6 fuel injection valve (Y62y6)
- Three-disk thermostat valve (Y110)
- Crank signal from the power electronics control unit (N129/1)
- Start signal from the power electronics control unit
LIN signals
- Alternator interface via drive LIN (LIN C1)
CAN input signals
Instrument cluster (A1)
- Fuel reserve signal
Restraint systems control unit (N2/7)
- Crash signal
Comfort AAC [KLA] control and operating unit (N22/7)
- Specified fan speed request
- Engine torque request
Regenerative braking system control unit (N30/6)
- Wheel speed signal
- Brake recognition
- Cruise control request
- Engine torque request
- Request for regenerative braking torque
Electric controller unit (VGS) (Y3/8)
- Drive position
- Transmission mode
- Actual gear, target gear
- 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
- Emergency transmission control
EIS [EZS] control unit (N73)
- Start enable (drive authorization system)
Battery management system control unit (N82/2)
- Status of the protection switch (A100s1)
- Open circuit voltage of high-voltage battery (A100g1)
- Voltage of high voltage battery
- Temperature of high voltage battery
- High-voltage battery currents
- Tolerable charging voltage/current
- Tolerable discharge voltage/current
- Status of the intermediate circuit discharge
DC/DC converter control unit (N83/1)
- Boost mode, status
- Buck mode, status
- Standby mode, status
- Input and output current values
Fuel pump control unit (N118)
- Pulse width modulated (PWM) signal duty cycle (fuel pump actuation (M3) 0 to 100%)
- Self-diagnosis data
- Requested diagnostic data
Power electronics control unit (N129/1)
- available torque - static/dynamic
- Electrical actual values
- Request for cooling of the integral starter-alternator (A79)
- Emergency running
- Status of the intermediate circuit discharge
CAN output signals
Instrument cluster (A1)
- 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))
- Hybrid drive system "READY", message
- Charge level of high-voltage battery
- Energy flow display, message
EIS [EZS] control unit (N73)
- Start query (drive authorization system)
Battery management system control unit (N82/2)
- Open/close protection switch
DC/DC converter control unit (N83/1)
- STANDBY MODE
- BOOST MODE
- BUCK MODE
Fuel pump control unit (N118)
- Diagnosis request
Power electronics control unit (N129/1)
- Engine hood closed/open
- Coolant temperature of cooling system for power electronics
- Request for torque prognosis
- Voltage requests and predictions
- Current requests and predictions
- Electrical limits
- Rotational speed/torque specifications
- Request for intermediate circuit discharge
Electric controller unit (VGS) (Y3/8)
- Requests for catalytic converter heating
- Switching request
- Engine coolant temperature
- Engine oil temperature
- Engine speed
- Engine load
- Kickdown
- Engine speed limitation active
- Limp-home mode engine control
Design
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 dusts.
The housing contains the 32-bit measuring and control electronics for the engine control.
Voltage supply
The ME-SFI [ME] control unit is "circuit 30 fused" and also supplied with a voltage for ignition ON by "circuit 87 M1" . It is fitted in the operating voltage range with short-circuit protection as well as reversed polarity protection.
Voltage is supplied through several pins connected in parallel to relieve the electrical connectors.
Ground connection
The "circuit 31" ground connection consists of several ground lines to the electronic ground (LH footwell) (W34/1).
Computer run-on
If the ME-SFI [ME] control unit receives the signal "circuit 15 OFF", a processor run-on of approx. 10 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 control variants, such as country and exhaust gas variants, are activated with the DAS (Diagnosis Assistance System) using the variant coding function.
Replacement of the ME-SFI [ME] control unit is not necessary.
