Me-SFI [Me] Control Unit, Component Description - GF07.61-D-6000HB

ENGINE 271.951 in MODEL 906 

Location 

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

Task 

In combination with the sensors and actuators for the 271 KE engine, the ME control unit controls the engine.

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
• Regulated camshaft adjustment
  • Charging
• Heat management
• Exhaust gas cleaning

The following information and signals from the following components are read in directly for control and coordination of the functions listed:

• Terminal 15
• Terminal 30 (fused)
• Terminal 31
• Terminal 87 M1
• Crash signal from Lowline airbag control unit (N2/14) or Highline airbag control unit (N2/15) (with code (SH6) Thoraxbag for driver (in seat backrest), with code (SH7) Thoraxbag for driver and front passenger (in seat backrest) or with code (SH9) Windowbag for driver and front passenger)
• Knock sensor (A16/7)
• Hot film MAF sensor (B2/13)
• Intake camshaft sensor (B6/21)
• Exhaust camshaft sensor (B6/22)
• Coolant temperature sensor (B11/18)
• Charge air temperature sensor (B17/14)
• Atmospheric pressure sensor (B18/4)
• Accelerator pedal module (B37/3)
• Alternator (G2/8)
• Oxygen sensor downstream of catalytic converter (G3/19)
• Oxygen sensor upstream of catalytic converter (G8/5)
• Crankshaft sensor (L5/12)
• Oil level switch (S43/3)
• Boost pressure sensor (B5/7)
• Clutch pedal switch (S40/3) (with transmission 711.6)

The following actuators are controlled directly for control and coordination of the functions listed:

• Heating of oxygen sensor downstream of catalytic converter
• Heating of oxygen sensor upstream of catalytic converter
• Fuel pump relay (K40/9k3)
• Circuit 50 starter relay (K40/9k5)
• Engine control relay, terminal 87 (K40/9k7)
• Terminal 15 relay (K40/9k8)
• Recirculating air flap actuator (M16/46)
• Throttle valve actuator (M16/47)
• Cylinder 1 ignition coil (T1/7)
• Cylinder 2 ignition coil (T1/8)
• Cylinder 3 ignition coil (T1/9)
• Cylinder 4 ignition coil (T1/10)
• Intake camshaft positioner (Y49/8)
• Exhaust camshaft positioner (Y49/9)
• Purge control valve (Y58/7)
• Air injection valve (Y59/6)
• Cylinder 1 fuel injection valve (Y62/27)
• Cylinder 2 fuel injection valve (Y62/28)
• Cylinder 3 fuel injection valve (Y62/29)
• Cylinder 4 fuel injection valve (Y62/30)

The ME control unit communicates with the following control units over the Controller Area Network bus, Class C (engine compartment) (CAN C):

• Instrument cluster (A1), actuation of EOBD indicator light (A1e17) and output of messages on display (A1p1)
• ETC control unit (N15/3) (with transmission 722.6), e.g. torque request by ETC control unit, actual and nominal curve information from ETC control unit
• EWM control unit (N15/5) (with transmission 722.6), Selector lever position
• ESP control unit (N30/4), e.g. torque requirement from ESP control unit, wheel speeds
• EIS control unit (N73), e.g. diagnosis communication, communication for enabling drive authorization system, stage 3 (DAS 3)
• PSM control unit (N26/15) (with code (ED8) Preinstallation parameterizable special module (PSM) or with code (ED5) Parameterizable special module (PSM), for attachment of special bodies)

The EIS control unit serves as an interface between the CAN C and the Controller Area Network bus, class B (interior) (CAN B), thereby allowing the ME control unit to communicate with the following control units:

• SAM control unit (N10)
• Lowline airbag control unit
• Highline airbag control unit (with code (SH6) Thoraxbag for driver (in seat backrest), with code (SH7) Thoraxbag for driver and front passenger (in seat backrest) or with code (SH9) Windowbag for driver and front passenger)
• AAC control and operating unit (S98), with code (HH9) Regulated air conditioning (Tempmatic) or code (H08) High performance air conditioning

The ME control unit has a fault memory which can be read out and deleted with the aid of Star Diagnosis via the 16-pin diagnostic socket (X11). The ME control unit is flashable and codable.