C 320 4MATIC Sedan (203.084) V6-3.2L (112.953) (2003)
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Injection system
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Ignition system
Electronic accelerator/cruise control/idle speed control
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Diagnosis/fault storage
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Drive authorization system/immobilizer
ME-SFI Control Unit Design
ME-SFI Control Unit, Design
ME2.7 and ME2.8 control unit
Engine 111 EVO (Siemens)
The ME-SFI control unit (N3/10) is made of aluminium and is designed as a shell concept standard housing. It is designed for installation in a
protective housing (right fuse box).
The cables are connected by means of 5 sockets.
PIN assignment at ME-SFI control unit (N3/10) and arrangement of connectors
Connector 1, 2, 3 Engine side
Connector 4, 5 Vehicle side
ME-SFI Control Unit Function
ME-SFI control unit function
Control of fuel injection system
The ME control unit actuates according to the input signals and the retracted performance maps in the ME control unit, the fuel injection valves
separately, corresponding to the firing order (sequential). The ME-SFI control unit calculates the opening times (injection times) of the fuel injectors.
Control of ignition system
The ME control unit actuates according to the input signals and the retracted performance maps in the ME control unit, the ignition coils or the
ignition system ECI. The ME-SFI control unit calculates the ignition angle values and controls the anti-knock control (AKC).
Control of idle speed control
The ME-SFI control unit operates the EA/CC/ISC actuator (throttle valve actuator) in line with the input signals and the maps stored in the ME-SFI
control unit.
Control of cruise control
The ME-SFI control unit operates the EA/CC/ISC actuator (throttle valve actuator) for the cruise control function in line with the input signals and the
position of the cruise control switch.
Additional cruise control functions are the variable vehicle speed limiter and the individually programmable permanent maximum speed and
Distronic.
Diagnosis/DTC memory