Component description for ME-SFI [ME] control unit

P07.61-3099-06

Shown on engine 266.960
with transmission 716.5

N3/10 ME-SFI [ME] control unit

Location

The ME control unit is located on the air filter housing.

Task

The ME-SFI [ME] control unit represents the engine control, when connected electrically with the sensors and actuators of engine 266 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

- Intake manifold switchover (for naturally aspirated engines)

- Boost pressure control (with turbocharged engine)

- Heat management

- Torque interface

- Alternator management

- 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

- Circuit 87 M2

- Knock sensor (A16)

- Tank pressure sensor (B4/3) (with code (494) USA version)

- Camshaft Hall sensor (B6/1)

- Coolant temperature sensor (B11/4)

- Intake air temperature sensor (B17)

- Pressure sensor (B28) (intake manifold air pressure)

- Pressure sensor downstream of air filter (B28/5) (for turbocharged engines)

- Pressure sensor upstream of throttle valve actuator (B28/6)
(for turbocharged engines)

- Accelerator pedal sensor (B37) - potentiometer 1

- Accelerator pedal sensor - potentiometer 2

-----------------------------------------------------------------------------------------

- Brake vacuum sensor (B64/1) (for code (B01) ECO Start-stop function)

- Position sensor for transmission neutral(B79/2) (for code (B01) ECO Start-stop function)

- O2 sensor downstream of CAT (G3/1) (non-linear oxygen sensor)

- O2 sensor upstream of CAT (G3/2) (non-linear oxygen sensor)

- Crankshaft position sensor (L5)

- 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)

- Clutch pedal switch (S40/3) (for manual transmission)

- Start enable clutch pedal switch (S40/5)
(for manual transmission and code (494) USA version and for code (B01) ECO Start-stop function)

- Oil pressure switch (S43/1)

- Oil pressure switch up (S43/2) (for turbocharged engines)

-----------------------------------------------------------------------------------------

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

- O2 sensor upstream of catalytic converter - sensor heater

- O2 sensor downstream of catalytic converter - 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) -

- Circuit 87 relay, engine (K100kL)

- Air pump relay (K100kI) (for code (494) USA version or code (924) Bivalent natural gas drive with code (426) CVT A/T and code (801) Model year 2011)

- Starter relay (K100kM) with engine 266.9 up to 05/2010 except code (B01) ECO start/stop function or for code (924) Bivalent natural gas drive up to 08/2009

-----------------------------------------------------------------------------------------

- Starter relay (K6) with engine 266.9 as of 06/2010 or for code (924) Bivalent natural gas drive as of 09/2009 or for code (B01) ECO start/stop function)

- Fuel pump relay (K100kK)

- Starter-alternator control unit (N129), signal Safety Lock (ECO start signal) (for code (B01) ECO Start-stop function)

- Cylinder 1+2 (T1/1) ignition coil

- Cylinder 3+4 (T1/2) ignition coil

- Variable intake manifold switchover valve (Y22/6) (for naturally aspirated engines)

- Boost pressure control pressure transducer (Y31/5) (for turbocharged engines)

- Air pump switchover valve (Y32) (for code (494) USA version or code (924) Bivalent natural gas drive with code (426) CVT A/T and code (801) Model year 2011)

- 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)

- Deceleration air switchover valve (Y101) (for turbocharged engines)

LIN signals

- Alternator interface via drivetrain LIN (LIN C1) (except code (B01) ECO Start-stop function)

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

EIS [EZS] control unit (N73)

- Drive authorization system 3 (DAS 3) start enable

-----------------------------------------------------------------------------------------

Starter-alternator control unit
(for code (B01) ECO Start-stop function)

- Diagnostic data

- Starter alternator, rotor position

- Starter-alternator, rotor speed

- Starter-alternator, temperature

ESP and BAS control unit (N47-5)

- Vehicle speed

- Wheel speed signal

- Brake recognition

- Engine torque request

Steering column tube module (N80)

- Cruise control request

CVT electric controller unit (Y3/9)
(with code (426) CVT automatic transmission)

- Drive position

- Transmission mode

-----------------------------------------------------------------------------------------

- 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

CNG control unit (N118/2)
(for code (924) Bivalent natural gas drive)

- Diagnostic data

- Injection adjustment

- Natural gas system status

- Gas cylinder fill level

- Exchange regarding vehicle operating mode (gasoline/natural gas)

CAN output signals

Instrument cluster

- Engine oil level too low

- Circuit 61 signal (generated by the ME-SFI [ME] control unit)

- Current fuel consumption

-----------------------------------------------------------------------------------------

CNG control unit
(for code (924) Bivalent natural gas drive)

- Diagnosis requests

- Engine load

- Engine speed

- Coolant temperature

- Exchange regarding vehicle operating mode (gasoline/natural gas)

Starter-alternator control unit
(for code (B01) ECO Start-stop function)

- Starter-alternator, actuation, starter operation

- Starter-alternator, actuation, alternator operation

CVT electric controller unit
(with code (426) CVT automatic transmission)

- Requests for catalytic converter heating

- Switching request

- Engine torque

- Engine coolant temperature

- Engine oil temperature

- Engine speed

-----------------------------------------------------------------------------------------

- Engine load

- Brake torque

- Accelerator pedal position

- Kickdown

- Engine speed limitation active

- Limp-home mode engine control

Design

The housing of the ME-SFI [ME] control unit is made of die-cast aluminum and the cover is made of corrosion-resistant aluminum sheet. 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 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. In this way, the engine control can continue to operate if a fuse fails.

Ground connection

The "circuit 31" ground connection consists of several ground lines from firewall ground (W43).

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.