ENGINE | 271.8 in MODEL 204, 207, 212 |
Front view of engine compartment model 212 |
N3/10 | ME-SFI [ME] control unit |
P07.61-3664-11
Location
The ME-SFI [ME] control unit is located on the left on the air filter housing.
Task
The ME-SFI [ME] control unit represents the engine timing, when connected electrically to the sensors and actuators of engine 271 EVO.
The following systems and functions are controlled and coordinated by the ME-SFI [ME] control unit according to input signals:
– Ignition system
- fuel supply
– High pressure gasoline injection
– electronic accelerator
- diagnosis and fault storage
– engine timing start stop function (with code (B03) ECO start/stop function)
- drive authorization system and immobilizer
– regulated camshaft adjustment
- boost pressure control
- torque interface
- alternator interface
– thermal management
- exhaust treatment
Input and output signals
The following input signals are evaluated by the engine timing system and respective output signals are issued:
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 M1.2
– circuit 87 M2.2
– rear knock sensor (A16/1)
– front knock sensor (A16/4)
– rail pressure sensor (B4/6)
- intake camshaft Hall sensor (B6/15),
- exhaust camshaft Hall sensor (B6/16)
– coolant temperature sensor (B11/4)
– charge air temperature sensor (B17/8)
- pressure sensor upstream of throttle valve (B28/6)
- pressure sensor downstream of throttle valve (B28/7)
- pressure sensor upstream of compressor impeller (B28/15)
– accelerator pedal sensor (B37) - potentiometer 1
– accelerator pedal sensor - potentiometer 2
– crankshaft Hall sensor (B70)
- position sensor for transmission neutral (B79/2) (for code (B03) ECO Start/stop function)
– oxygen sensor downstream of catalytic converter (G3/1)
– oxygen sensor upstream of catalytic converter (G3/2)
– throttle valve - actual value potentiometer 1 (M16/6r1)
– throttle valve - actual value potentiometer 2 (M16/6r2)
– swirl flap Hall sensor (M59b1)
– crash signal from supplemental restraint system control unit (N2/10) (model 204), supplemental restraint system control unit (N2/10) (model 207, 212)
– clutch pedal switch (S40/3) (with manual transmission)
- start enable clutch pedal switch (S40/5) (for manual transmission and for code (B03) ECO start/stop function)
– oil level check switch (S43)
Direct output signals
- sensor voltages 1 and 2 (5 V) - engine connector
- sensor voltages 1 and 2 (5 V) - vehicle connector
- sensor grounds 1 and 2 - engine connector
- sensor ground 1 - vehicle connector
– accelerator pedal sensor - reference masses for potentiometer 1 and 2
- oxygen sensor upstream of catalytic converter - oxygen sensor heater
- oxygen sensor downstream of catalytic converter - oxygen sensor heater
- fan motor for internal combustion engine and air conditioning system with integrated control (M4/7) - specified fan speed
- throttle valve actuator motor (M16/6m1) +
- throttle valve actuator motor (M16/6m1) -
– swirl flap actuator motor (M59m1) +
– swirl flap actuator motor (M59m1) –
– circuit 50 relay, starter (N10/1kM)
– engine circuit 87 relay (N10/1kN)
- secondary air injection relay (N10/1kP) up to 12/2009 (except code (498) Japan version)
– FSCU (N118) - ground signal "fuel pump ON"
- wide open throttle operation vent line heater element (R39/2) (as of YoM 11)
- coolant 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)
- heating system shutoff valve (Y16/2)
- boost pressure control pressure transducer (Y31/5)
– air pump switchover valve (Y32) up to (12/2009 (except code (498) Japan version))
– intake camshaft solenoid (Y49/1)
– exhaust camshaft solenoid (Y49/2)
– purging switchover valve (Y58/1)
– cylinder 1 fuel injector (Y76/1)
– cylinder 2 fuel injector (Y76/2)
– cylinder 3 fuel injector (Y76/3)
– cylinder 4 fuel injector (Y76/4)
– radiator shutters actuator (Y84)
– quantity control valve (Y94)
– deceleration air switchover valve (Y101)
LIN signals
– alternator interface via the drive LIN (LIN C1)
CAN input signals
IC (A1)
- fuel reserve signal
Supplemental restraint system control unit (model 204), supplemental restraint system control unit (model 207, 212)
- crash signal
Front SAM control unit with fuse and relay module (N10/1)
– driver seat belt buckled
- engine hood closed (for code (U60) Pedestrian protection)
- engine hood closed (for code (551) Antitheft alarm system (ATA)
Electronic transmission control control unit (N15/3) (for code (423) 5-speed automatic transmission (NAG)) or fully integrated transmission control controller unit (Y3/8) (for code (427) 7-speed automatic transmission)
- gear range
- transmission mode
- actual gear engaged, target gear
- engine torque request (reduction)
- 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
- limp-home mode transmission control
AIRMATIC control unit (N51/3) (with code (489) AIRmatic (air suspension with continuous adjustment damping))
- engine start request
- engine stop prohibition
Automatic air conditioning control and operating unit (N22/7)
– specified fan speed request
– engine torque request
- air conditioning status
- engine start request
- engine stop prohibition
Electronic Stability Program control unit (N30/4) (except code (233) DISTRONIC PLUS) or Electronic Stability Program Premium control unit (N30/7) (for code (233) DISTRONIC PLUS)
- vehicle speed
– wheel speed signal
- brake recognition
– cruise control request
– engine torque request
- engine start request
- engine stop prohibition
- engine stop enable
The Electronic Stability Program control unit will be used in service as of 1.3.2011 (model 204.0/2.) or as of 1.6.2011 (model 204.3) in 2 variants:
- Electronic Stability Program control unit, basis variant (except code (233) DISTRONIC PLUS)
- Electronic Stability Program control unit, Premium variant (except code (233) DISTRONIC PLUS)
Up to 28.2.2011 or 31.5.2011 only the Electronic Stability Program control unit base variant will be used.
Radar sensors control unit (N62/1) (model 207.3/4 up to 31.5.11 for code (233) DISTRONIC PLUS, 212.0/2 up to 31.5.10 for code (233) DISTRONIC PLUS or code (234) Blind Spot Assist) or video and radar sensor system control unit (N62/2) (model 212.0/2 as of 1.6.10, model 204.0/2.and model 207.3/4 as of 1.6.11, model 204.3 with code (233) DISTRONIC PLUS, code (237) Active Blind Spot Assist or code (238) Active Lane Keeping Assist)
Left front door control unit (N69/1)
– engine torque request
- driver door closed
Upper control panel control unit (N72/1)
- status button for ECO start/stop function (N72/1s50) (with code (B03) ECO start/stop function)
Electronic ignition lock control unit (N73)
- start enable (drive authorization system)
Steering column tube module control unit (N80)
- steering wheel angle
- steering wheel angular velocity
Fuel system control unit (N118)
– fuel pressure
– self-diagnosis data
– requested diagnostic data
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))
Electronic ignition lock control unit
– start enable request (drive authorization system)
Electronic transmission control control unit (for code (423) 5-speed automatic transmission (NAG)) or fully integrated transmission control controller unit (for code (427) 7-speed automatic transmission)
Requests for catalytic converter heating
Switching request
- engine torque
- engine coolant temperature
- engine speed
- engine load
- kickdown
- engine speed limitation active
- limp-home mode engine timing
Fuel system control unit
– Fuel pump ON
– fuel requirements
- diagnosis request
Body
The housing of the ME-SFI [ME] control unit is made out of die-cast aluminum and the cover is made out of corrosion-proof sheet steel. The ME-SFI [ME] control unit is protected against water and dust.
The housing contains the 32-bit measuring and control electronics for the engine timing.
Power supply
The ME-SFI [ME] control unit is "circuit 30 fused" and also supplied with a voltage for ignition ON by "circuit 87 M1.2and M2.2".
In the operating voltage range it has both short-circuit protection and reversed polarity protection.
Power is supplied through several pins connected in parallel to relieve the electrical connectors.
Ground connection
The "circuit 31" ground connection is made via several ground lines to the left major assembly compartment electronics ground point (W16/5).
Computer power-down
If the ME-SFI [ME] control unit receives the signal "circuit 15 OFF", a processor run-on of approx. 10 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 timing variants (e.g. national and exhaust variants) are activated with Xentry Diagnostics using the variant coding function.
Replacement of the ME-SFI [ME] control unit is not necessary.