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

ENGINE 273 in MODEL 463.202 /222 /236 /237 up to 31.5.12 as of model year 2009/YoM 08 

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 273. 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 and tumble flap switchover
• Heat management
• Torque interface
• Alternator interface
• Emission control

The ME-SFI [ME] control unit exchanges data to do this with other control units via the connected drive train CAN (CAN C).

The following input signals are evaluated by the engine control and issued in the respective output signals:

• Direct input signals 
• Direct output signals 
• Local Interconnect Network (LIN) signals 
• Drive train CAN input signals 
• Drive train CAN output signals 

Direct input signals 

• Circuit. 15
• Circuit 30 (fused)
• Circuit. 31
• Circuit 87 M1
• Knock sensor 1, right (A16/1)
• Knock sensor 2, left (A16/2)
• Hot film mass air flow sensor (/)B2/5
• Intake air temperature sensor (B2/5b1)
• Tank pressure sensor (B4/3) (for code (ZU8) USA version)
• LH intake camshaft Hall sensor (B6/4)
• RH intake camshaft Hall sensor (B6/5)
• LH exhaust camshaft Hall sensor (B6/6)
• RH exhaust camshaft Hall sensor (B6/7)
• Coolant temperature sensor ()B11/4
• Pressure sensor (B28) (intake manifold air pressure)
• Left intake manifold tumble flap position sensor (B28/9)
• Right intake manifold tumble flap position sensor (B28/10)
• Accelerator pedal sensor (B37) - potentiometer 1
• Accelerator pedal sensor - potentiometer 2
• Crankshaft Hall sensor (B70)
• Left O₂ sensor, upstream of catalytic converter (G3/3) (wideband oxygen sensor)
• Right O₂ sensor, upstream of catalytic converter (G3/4) (wideband oxygen sensor)
• LH O₂ sensor downstream of 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 (M16/6r1)
• Drive actual value potentiometer (M16/6r2)
• Crash signal from the restraint system control unit (N2/7)
• 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 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 -
• Circuit 87 relay, engine (N10/1kR)
• Secondary air pump relay (N10/1kO)
• Starter relay (N10/1kS)
• Fuel pump relay (N10/2kA)
• 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)
• Cylinder 7 ignition coil (T1/7)
• Cylinder 8 ignition coil (T1/8)
• Variable intake manifold changeover valve (Y22/6)
• Intake manifold tumble flap switchover valve (Y22/9)
• Air pump switchover valve (Y32)
• LH intake camshaft solenoid (Y49/4)
• RH intake camshaft solenoid (Y49/5)
• LH exhaust camshaft solenoid (Y49/6)
• RH exhaust camshaft solenoid (Y49/7)
• Purge control valve (Y58/1)
• Activated charcoal canister shutoff valve (Y58/4) (with code (ZU8) USA version)
• Cylinder 1 valve (Y62y1)
• Cylinder 2 valve (Y62y2)
• Cylinder 3 valve (Y62y3)
• Cylinder 4 valve (Y62y4)
• Cylinder 5 valve (Y62y5)
• Cylinder 6 valve (Y62y6)
• Cylinder 7 valve (Y62y7)
• Cylinder 8 valve(Y62y8)
• Three-disk thermostat valve (Y110)
• Engine speed signal

LIN signals 

• Alternator interface

Drive train CAN input signals 

• Instrument cluster (A1)
  • Fuel reserve signal
• AAC [KLA] control and operating unit (N22)
  • Specified fan speed request
  • Engine torque request
• ESP control unit (/)N30/4
  • Vehicle speed
  • Wheel speed signal
  • Brake recognition
  • Cruise control request
  • Engine torque request
• Electric controller unit (VGS) (Y3/8)
  • 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 operation transmission control
• EIS [EZS] control unit (N73)
  • Start enable (drive authorization system)

Drive train CAN output signals 

• Instrument cluster
  • 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))
• EIS [EZS] control unit
  • Start query (drive authorization system)
• Electric controller unit (VGS)

  Requests for catalytic converter heating Switching request

  • Engine torque
  • 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 secured" and also supplied with 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.

In certain cases voltage is supplied through several pins connected in parallel by to relief the electrical connectors.

Ground connection:

The ground connection "circuit 31" is made via a number of ground lines to the right major assemblies compartment ground, power ground (W16/4).

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 (e.g. on-board diagnosis, drive authorization system, 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. In this it id possible to avoid destruction of the ME-SFI [ME] control unit and wrong storage of data by the control units in the Control Area Network (data bus/CAN bus) (CAN) network.

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.