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Home >> Mercedes Benz >> 2012 >> CL 550 4MATIC (216.394) V8-4.6L Turbo (278.920) >> Repair and Diagnosis >> Powertrain Management >> Relays and Modules - Powertrain Management >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Description and Operation

Engine Control Module: Description and Operation




GF07.61-P-6000MMC Component Description For ME-SFI [ME] Control Unit
- ENGINES 157.9 in MODEL 216.3, 221.0 /1
- ENGINES 278.9 in MODEL 216.3, 221.0 /1





View of engine from front
N3/10 ME-SFI [ME] control unit

Location
The ME-SFI [ME] control unit is located at the center on the charge air manifold.

Task
The ME-SFI [ME] control unit creates in an electrical combination with the sensors and actuators of engines 157 and 278 DE ( Direct-Injection) the engine timing.

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
- Engine start/stop function (for code (B03) ECO start/stop function)
- 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 87M4
- Front knock sensor (left side of engine) (A29/1)
- Rear knock sensor (left side of engine) (A29/2)
- Front knock sensor (right side of engine) (A30/1)
- Rear knock sensor (right side of engine) (A30/2)
- Tank pressure sensor (B4/3) (with code (494) USA version)
- Fuel pressure and temperature sensor (B4/25)
- 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
- Intake air temperature sensor (B17)
- Pressure sensor downstream of air filter, LH cylinder bank (B28/4)
- Pressure sensor downstream of air filter, RH cylinder bank (B28/5)
- Pressure sensor upstream of throttle valve actuator (B28/6)
- Pressure sensor downstream of throttle valve actuator (B28/7)
- Accelerator pedal sensor (B37) - potentiometer 1
- Accelerator pedal sensor - potentiometer 2
- Crankshaft Hall sensor (B70)
- Left O2 sensor upstream of CAT(G3/3)
- Right O2 sensor upstream of CAT (G3/4)
- Left O2 sensor downstream of CAT (G3/5)
- Right O2 sensor downstream of CAT (G3/6)
- Throttle valve - actual value potentiometer 1 (M16/6r1)
- Throttle valve - actual value potentiometer 2 (M16/6r2)
- Circuit 15 (2)/spare 1 relay (changeover contact) (N10/1kD)
- Crash signal from the restraint system control unit (N2/7)
- Oil level check switch (S43) (for engine 278)

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 of potentiometers 1 and 2
- LH O2 sensor, upstream of CAT - oxygen sensor heater
- RH O2 sensor, upstream of CAT - oxygen sensor heater
- LH O2 sensor, downstream of CAT - oxygen sensor heater
- RH O2 sensor, downstream of CAT - 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) (Plus)
- Throttle valve - actuator motor (M16/6m1) (Minus)
- Circuit 50 relay, starter (N10/1kH)
- Circuit 87 relay, engine (N10/1kC)
- Circulation pump relay (N10/2kQ)
- Fuel pump control unit (N118) - "fuel pump ON" ground signal
- Two-disk 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)
- Cylinder 5 ignition coil (T1/5)
- Cylinder 6 ignition coil (T1/6)
- Cylinder 7 ignition coil (T1/7)
- Cylinder 8 ignition coil (T1/8)
- Heating system shutoff valve (Y16/2) up to 05/2011
- 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 injector (Y76y1)
- Cylinder 2 fuel injector (Y76y2)
- Cylinder 3 fuel injector (Y76y3)
- Cylinder 4 fuel injector (Y76y4)
- Cylinder 5 fuel injector (Y76y5)
- Cylinder 6 fuel injector (Y76y6)
- Cylinder 7 fuel injector (Y76y7)
- Cylinder 8 fuel injector (Y76y8)
- Boost pressure regulator (Y77/1) (boost pressure control pressure transducer)
- Exhaust flap switchover valve (Y93) (for model 221 with engine 278)
- Left quantity control valve (Y94/1)
- Right quantity control valve (Y94/2)
- Engine oil pump valve (Y130)

LIN signals
- Alternator interface via drive LIN (LIN C1)
- Cooler sensor for engine diagnosis (B11/15) via drive LIN (with code (494) USA version and code (917) Partial zero emission vehicle USA) (on engine 278)
- Oil sensor (oil level, temperature and quality) (B40) via the drivetrain LIN (for engine 157)

CAN input signals
Instrument cluster (A1)
- Fuel reserve signal

Restraint systems control unit (N2/7)
- Crash signal
- Driver seat belt applied

Rear SAM control unit with fuse and relay module (N10/2)
- Engine hood closed (for code (551) Antitheft alarm system (EDW)

AAC control unit (N22/1)
- Specified fan speed request
- Air conditioning status
- Engine torque request
- Engine start request
- Engine stop prohibition

ESP control unit (N47-5)
- Vehicle speed
- Wheel speed signal
- Brake recognition
- Cruise control request
- Engine torque request (increase)
- Engine torque request (reduction)
- Engine start request
- Engine stop prohibition
- Engine stop release

AIRMATIC with ADS control unit (N51) (for code (489) AIRMATIC (air suspension with continuous adjustment damping)
- Engine start request
- Engine stop prohibition

Video and radar sensor system control unit (N62/2) (for code (233) DISTRONIC PLUS, code (237) Active Blind Spot Assist and code (238) Active Lane Keeping Assist)
- Engine torque request (increase)
- Engine torque request (reduction)

Left door control unit (N69/1) (for model 216) and left front door control unit (N69/1) (for model 221)
- Driver door closed

Upper control panel control unit (N72/1)
- ECO start/stop function status button

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

Steering column tube module (N80)
- Steering wheel angle
- Steering wheel angular velocity

Fuel system control unit (N118)
- Fuel pressure
- Self-diagnosis data
- Requested diagnostic data

Electric controller unit (VGS) (Y3/8)
- Drive position
- Transmission mode
- Actual gear, target gear
- Engine torque request (reduction)
- Starter enable in selector lever position "P, N"
- Nominal rotational speed for engine idle (for actuation of the torque converter lockup clutch for engine 278 or the start-up clutch for engine 157)
- Status of the torque converter lockup clutch (for engine 278)
- Status of the start-up clutch (for engine 157)
- Emergency transmission limp-home mode
- Transmission oil temperature

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))

EIS control unit
- Start enable request (drive authorization system)

Fuel pump control unit
- Fuel pump ON
- Specified fuel pressure
- Diagnosis request

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.

Power supply
The ME-SFI [ME] control unit is "circuit 30 fused" and also supplied with a voltage for ignition ON by "circuit 87 M4".
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 link consists of several ground lines from electronic ground (LH footwell) ( W34/1).

Computer run-on
If the ME-SFI [ME] control unit receives the signal "circuit 15 OFF", a processor run-on of approx. 4 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.






















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