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

ENGINE 271.910 in MODEL 204.044/045/245 

ENGINE 271.950 in MODEL 204.041/241 as of model year 2009/AEJ 08 

ENGINE 271.952 in MODEL 204.046/246 as of model year 2009/AEJ 08 

View of engine from front left 

Location 

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

Task 

The ME-SFI [ME] control unit is connected electrically with the sensors and actuators of engine 271 KE (Kanal-Einspritzung (port injection)) to form the engine control.

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
• Charge pressure control
• Heat management
• Torque interface
• Alternator interface
• 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 87 M1
• Rear knock sensor (A16/1)
• Front knock sensor (A16/4)
• Hot film mass air flow sensor (B2/5)
• Intake camshaft Hall sensor (B6/15)
• Exhaust camshaft Hall sensor (B6/16)
• Coolant temperature sensor (B11/4)
• Intake air temperature sensor (B17)
• Pressure sensor (intake manifold air pressure) (B28)
• Accelerator pedal sensor (B37) - potentiometer 1
• Accelerator pedal sensor - potentiometer 2
• Oxygen sensor downstream of catalytic converter (G3/1) (non-linear oxygen sensor)
• Oxygen sensor upstream of catalytic converter (G3/2) (wideband oxygen sensor)
• Crankshaft position sensor (L5)
• 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)
• Clutch pedal switch (S40/3) (for manual transmission)
• 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) (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 starter relay (N10/1kM)
• Engine circuit 87 relay (N10/1kN)
• Fuel pump control unit (N118) - "fuel pump ON" ground signal
• 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)
• Purge control valve (Y58/1)
• Cylinder 1 injection valve (Y62/1)
• Cylinder 2 injection valve (Y62/2)
• Cylinder 3 injection valve (Y62/3)
• Cylinder 4 injection valve (Y62/4)

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

Electronic transmission control, control unit (N15/3) (for automatic 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 control

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

• Specified fan speed request
• Engine torque request

Electronic Stability Program control unit (N30/4) 

• Vehicle speed
• Wheel speed signal
• Brake recognition
• Cruise control request
• Engine torque request

Electronic ignition lock control unit (N73) 

• Start enable (drive authorization system)

Fuel pump control unit (N118) 

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

CAN output signals 

Instrument cluster (A1) 

• Engine oil level too low
• Circuit 61 signal (generated by the 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 lock control unit (N73) 

• Start enable request (drive authorization system)

Fuel pump control unit (N118) 

• Fuel pump ON
• Nominal pressure of the fuel
• Diagnosis request

Electronic transmission control, control unit (N15/3) (for 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

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.

Power supply 

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

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 is via several ground lines from the left electronic assembly compartment 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. 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 control variants, such as country and exhaust gas variants, are activated with the Diagnosis Assistance System (DAS) using the variant coding function.

Replacement of the ME-SFI [ME] control unit is not necessary.

	Wiring diagram for ME-SFI [ME] gasoline injection and ignition system control unit	N3/10	Vehicle connector (sheet 1)	PE07.61-P-2101-99FAB
		N3/10	Engine connector (Sheet 2)	PE07.61-P-2101-99FAA