Powertrain Management: Description and Operation

GF07.61-P-6000MLG ME-SFI [ME] Control Unit, Component Description
- as of model year 09

Component Identification:

Location
The ME-SFI [ME] control unit is located in the middle on the variable intake manifold.

Task
The ME-SFI [ME] control unit forms the engine control when connected electrically with the sensors and actuators of engine 273 KE (Kanal-Einspritzung (port injection)).
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 control unit exchanges data with the other control units on the CAN network over the engine compartment CAN (CAN C).

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
- Knock sensor 1, on the right (A16/1)
- Knock sensor 2, on the left (A16/2)
- Hot film mass air flow sensor (B2/5)
- Intake air temperature sensor (B2/5b1)
- Tank pressure sensor (B4/3) (with code (494) USA version)
- 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)
- 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 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 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)

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 (M16/6m1) -
- Engine circuit 87 relay (F58kD)
- Air pump relay (F58kE)
- Starter relay (F58kI)
- 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)
- 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)
- 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)
- Activated charcoal canister shutoff valve (Y58/4) (with code (494) USA version)
- 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)
- Cylinder 7 fuel injection valve (Y62y7)
- Cylinder 8 fuel injection valve (Y62y8)
- Three-disk thermostat valve (Y110)
- Engine speed signal (TN)

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

ESP control unit (N47-5)
- Vehicle speed
- Wheel speed signal
- Brake recognition
- Cruise control request
- Engine torque request

Electric controller unit (VGS) control unit (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 transmission control

EIS [EZS] control unit (N73)
- Start enable (drive authorization system)

Fuel pump control unit (N118)
- Diagnostic data

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 control unit
- Start query (drive authorization system)

Fuel pump control unit
- Diagnosis requests

Electric controller unit (VGS) control unit
- 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.

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

Ground connection
The ground connection "circuit 31" takes place via a number of ground lines to the left major assemblies compartment ground, power ground (W16/3).

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. 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.