GF07.61-P-0001MAW Motor Electronics (ME-SFI) Fuel Injection and Ignition System, Function

GF07.61-P-0001MAW Motor Electronics (ME-SFI) Fuel Injection And Ignition System, Function







Gasoline injection and ignition system ME-SFI, general
The gasoline injection and ignition system ME-SFI is supplied by "Robert Bosch GmbH" and, in combination with the sensors and actuators on engine 156 AMG, forms the "ME 9.7 AMG" engine control.

The abbreviated designation "ME 9.7 AMG" means:
M = Motronic
E = Electronic accelerator pedal
9.7 = Version 9.7
AMG = AMG specific hardware and software

The ME-SFI [ME] control unit (N3/10) contains the whole engine control.
Sensor data is directly read in from the engine control and indirectly via the CAN interconnection and actuates the respective actors. Here the individual functions and systems of the engine control are controlled and coordinated by the ME-SFI [ME] control unit.

The following table represents the model and major assembly overviews for the engine 156 AMG:







The engine control is sub-divided into the following points:
^ Basic functions
^ Engine system
^ Injection system
^ Ignition system
^ Exhaust system

Basic functions
- Control system diagnosis
- Fault memory
- On-board diagnosis II (OBD II)
- Diagnosis via CAN
- CAN interconnection
- Flash programming
- Variant coding
- Drive authorization system 3 (DAS 3)
- Torque coordination
- Heat management
- Alternator interface
- Maximum vehicle speed limit

Diagnosis
For diagnostic purposes, the fault codes from the engine control can be read off and deleted with the Xentry diagnostics, and specific diagnostic functions initiated.

CAN interconnection
Over the connected drive train CAN (CAN C) and chassis CAN (CAN E), the ME-SFI [ME] control unit exchanges data with the other control units integrated in the CAN network.
The ME-SFI [ME] control unit also acts as the interface (gateway) between the two CAN bus systems.

Flash programming
The engine control in the ME-SFI [ME] control unit is flash programmable, that is the complete software in the control unit can be replaced using the Xentry diagnostics (replaced). The software required for control unit programming can be found on the Star Diagnosis update DVD.

Variant coding
Using variant coding the following vehicle versions and equipment can be coded using the Xentry diagnostics:
- Vehicle model
- National version
- Exhaust variants
- Transmission version
- With or without catalytic converter

Engine system
- Start relay actuation
- Throttle flap control
- Safety fuel shutoff
- Transmission overload protection
- Secondary air injection
- Support for Electronic Stability Program (ESP)
- Support for fully integrated transmission control (VGS)
- Starting torque limitation
- Suction fan actuation
- Controlled intake/exhaust camshaft adjustment
- Throttle valve calibration
- Intake manifold length switchover
- Engine oil cooling

Injection system
- Sequential port injection
- Cylinder-selective fuel metering
- Start, post-start phase and acceleration enrichment
- Warm running regulation
- Idle speed control
- Limp-home function
- RPM increase of air conditioning
- Inertia fuel shutoff
- Fuel pump control
- Altitude adaptation
- Load change function
- Rpm limitation

Ignition system
- Single spark ignition
- Ignition map
- Rpm limitation
- Knock sensor system
- Synchronization of camshaft and crankshaft positions

Exhaust system
- Catalytic converter heating
- Oxygen sensor heater control unit
- Straight-line lambda control

The operating conditions of the engine and the active partial functions of the engine control is described in the following documents:
^ Ignition ON function
^ Starting, function
^ Ignition OFF function
^ Fuel supply, function
^ Injection regulation, function
^ Ignition system function
^ Synchronizing fuel injection and firing order function
^ Start, post-start phase and warm-up enrichment, function
^ Rpm control, function
^ Alternator interface function
^ Lambda control, function
^ Smooth running control, function
^ Thermal management, function
^ Torque coordination, function
^ Deceleration fuel shutoff function
^ Knock control, function
^ Camshaft adjustment, function
^ Intake manifold switchover, function
^ Engine limp-home mode, function
^ On-board diagnosis, function
^ Emission control function
^ Electronic accelerator function
^ Refueling gas recovery function (with code (494) USA version)
^ Purging function
^ System purging with leak test function (with code (494) USA version)