Component description for ME-SFI [ME] control unit - GF07.61-P-6000MG

ENGINES 271.820 in MODEL 204.0 /2 /3 

ENGINES 271.860 in MODEL 204.0 /2 /3, 207.3 /4, 212.0 /2 

Front view of engine compartment model 212 

Location 

The ME-SFI [ME] control unit is located on the left at the air filter housing.

Task 

The ME-SFI [ME] control unit represents the engine control, when connected electrically to the sensors and actuators of engine 271 EVO.

The following systems and functions are controlled and coordinated by the ME-SFI [ME] control unit according to input signals:

• ignition system
• fuel supply
• high pressure gasoline injection
• electronic accelerator
• diagnosis and fault storage
• engine timing start stop function (for code (B03) ECO start/stop function)
• drive authorization system and immobilizer
• regulated camshaft adjustment
• charge pressure control
• torque interface
• alternator interface
• heat management
• emission control

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 87M1.2
• Circuit 87M2.2
• Rear knock sensor (A16/1)
• Front knock sensor (A16/4)
• Rail pressure sensor (B4/6)
• 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 upstream of throttle valve (B28/6)
• Pressure sensor downstream of throttle valve (B28/7)
• Pressure sensor upstream of compressor impeller (B28/15)
• Accelerator pedal sensor (B37) - potentiometer 1
• Accelerator pedal sensor - potentiometer 2
• Crankshaft Hall sensor (B70)
• Position sensor for transmission neutral(B79/2) (for code (B03) ECO Start-stop function)
• Oxygen sensor downstream of catalytic converter (G3/1)
• Oxygen sensor upstream of catalytic converter (G3/2)
• Throttle valve actual value potentiometer 1 (M16/6r1)
• Throttle valve actual value potentiometer 2 (M16/6r2)
• Swirl flap Hall sensor (M59b1)
• Crash signal from supplemental restraint system control unit (N2/10)
• Clutch pedal switch (S40/3) (for manual transmission)
• Start enable clutch pedal switch (S40/5) (for manual transmission and for code (B03) ECO start/stop function)
• Oil level check switch (S43)

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 ground 1 - vehicle plug
• 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 combustion engine and air conditioning system with integrated control (M4/7) - specified fan speed
• Throttle valve - actuator motor (M16/6m1) +
• Throttle valve - actuator motor (M16/6m1) -
• Swirl flap actuator motor (M59m1) +
• Swirl flap actuator motor (M59m1) -
• Circuit 50 starter relay (N10/1kM)
• Engine circuit 87 relay (N10/1kN)
• Secondary air injection relay (N10/1kP) up to 12/2009 (except code (498) Japan version)
• Fuel pump control unit (N118) - "fuel pump ON" ground signal
• Wide open throttle operation vent line heater element (R39/2) (as of YoM 11)
• Coolant thermostat heating element (R48)
• 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)
• Boost pressure control transducer (Y31/5)
• Air pump switchover valve (Y32) up to 12/2009 (except code (498) Japan version)
• Intake camshaft solenoid (Y49/1)
• Exhaust camshaft solenoid (Y49/2)
• Purge control valve (Y58/1)
• 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)
• Divert air switchover valve (Y101)

LIN signals 

• Alternator interface via drive LIN (LIN C1)

CAN input signals 

Instrument cluster (A1) 

• Fuel reserve signal

Supplemental restraint system control unit (N2/10) 

• Crash signal
• Driver seat belt applied
• Engine hood closed (for code (U60) Pedestrian protection)

Front SAM control unit with fuse and relay module (N10/1) 

• Engine hood closed (for code (551) Antitheft alarm system (EDW)

Electronic transmission-control control unit (N15/3) (for code (423) 5-speed automatic transmission (NAG)) or fully integrated transmission control controller unit (Y3/8) (for code (427) Automatic 7-speed transmission) 

• Drive position
• Transmission mode
• Actual gear, target gear
• Engine torque reduction request
• 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 limp-home mode

AIRmatic control unit (N51/3) (with code (489) AIRmatic (air suspension with continuous adjustment damping)) 

• Engine start request
• Engine stop prohibition

Automatic air conditioning control and operating unit (N22/7) 

• Specified fan speed request
• Engine torque request
• A/C status
• Engine start request
• Engine stop prohibition

Electronic Stability Program control unit (N30/4) (except code (233) DISTRONIC PLUS) or Premium Electronic Stability Program control unit (N30/7) (with code (233) DISTRONIC PLUS) 

• Vehicle speed
• Wheel speed signal
• Brake recognition
• Cruise control request
• Engine torque request
• Engine start request
• Engine stop prohibition
• Engine stop enable

Radar sensors control unit (N62/1) (model 207.3/4 up to 31.5.11 with code (233) DISTRONIC PLUS, 212.0/2 up to 31.5.10 with code (233) DISTRONIC PLUS or code (234) Blind Spot Assist) or video and radar sensor system control unit (N62/2) (model 212.0/2 as of 1.6.10, model 204.0/2 and model 207.3/4 as of 1.6.11, model 204.3 with code (233) DISTRONIC PLUS, code (237) Active Blind Spot Assist or code (238) Active Lane Keeping Assist) 

• Engine torque request

Left front door control unit (N69/1) 

• Driver door closed

Upper control panel control unit (N72/1) 

• Status button for ECO start/stop function (N72/1s50) (with code (B03) ECO start/stop function

Electronic ignition lock control unit (N73) 

• Start enable (drive authorization system)

Steering column module control unit (N80) 

• Steering wheel angle
• Steering wheel angular velocity

Fuel system control unit (N118) 

• Fuel pressure
• Self-diagnosis data
• Requested diagnostic data

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 ignition switch control unit 

• Start enable request (drive authorization system)

Electronic transmission control unit (for code (423) 5- speed automatic transmission (NAG)) or fully integrated transmission control controller unit (for code (427) 7-speed automatic transmission) 

• 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 control

Fuel pump control unit 

• Fuel pump ON
• Fuel requirements
• Diagnosis request

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 dust.

The housing contains the 32-bit measuring and control electronics for the engine control.

Power supply 

The ME-SFI [ME] control unit is "circuit 30 fused" and also supplied with a voltage for ignition ON by "circuit 87 M2.2 and M1.2".

In the operating voltage range it has both short-circuit protection and reversed polarity protection.

Voltage is supplied through several pins connected in parallel to relieve the electrical connectors.

Ground connection 

The "circuit 31" ground connection is made via several ground lines to the left major assembly compartment electronics ground point (W16/5).

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 (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.