Common Rail Diesel Injection (CDI), Function - GF07.16-P-0001OGF

Engine 642.8 in model 166 

as of model year 2016 

Engine 642.8 in model 292 

Courtesy of MERCEDES-BENZ USA

Direct input, output signals 

Courtesy of MERCEDES-BENZ USA

CAN cross-linking 

Common rail diesel injection (CDI), general points 

The CDI forms the Engine management "CR61" in the electrical network with the sensors and actuators of Engine 642.8.

The short designation "CR61" stands for:

CR = Common Rail

61 = generation 61

The "common rail" is the line shared by all injectors for fuel delivery. The fuel upstream of the injection is stored in this common line. The entire Engine management is located in the CDI control unit. Sensor data are read in directly by the Engine management and indirectly via the CAN network and the respective actuators are actuated. The individual functions and systems of the Engine management are controlled and coordinated by the CDI control unit.

The Engine management is subdivided into the following systems:

• Basic functions 
• Engine system 
• Diesel injection system 
• Air control system 
• Exhaust system 

Basic functions 

• Control unit diagnosis
• Control module programming
• Fault memory
• EOBD II (EOBD II)
• DAS stage 4 (FBS 4)
• Torque coordination
• Heat management
• Alternator interface
• Synchronization
• Load determination

For diagnostic purposes, the fault codes of the Engine management system can be read out and deleted and individual diagnostic functions can be specifically actuated.

The vehicle model, national version, exhaust gas variant, transmission version can, for example, be coded with the variant coding.

The Engine management in the ME-SFI [ME] control unit is programmable, i. e. the software of the control unit can be exchanged (replaced). The software required for control unit programming can be found on the diagnosis system software DVD.

In transport mode various functions of the Engine management are limited. If the kilometer reading of the vehicle is more than 250 km, the system status "Transport mode" is automatically deactivated and can also not be reactivated by means of the diagnostic tester.

The CDI control unit communicates via the Engine CAN and drive CAN with the powertrain control unit. The powertrain control unit is the interface (gateway) for networking in the vehicle.

Engine system 

• Start relay actuation
• Throttle valve control
• Safety fuel shutoff
• Transmission overload protection
• Support for ESP®
• Fully integrated transmission control support
• Drive off torque limitation and anti-jerk control
• Fan operation
• Alternator regulation and glow time control
• Engine management, start/stop function (with code B03 (ECO start/stop function))

Diesel injection system 

• Pre, main and post injection
• Idle speed control and rpm limitation
• Smooth running control
• Limp-home function
• A/C rpm increase
• Inertia fuel shutoff
• Fuel pressure control
• Fuel pump controlling
• Fuel high-pressure pump controller
• Altitude adaptation

Air control system 

• Exhaust gas recirculation (EGR)
• Charge pressure control
• Intake air throttling through intake port shutoff (EKAS)

Exhaust system 

• Catalytic converter heating
• Oxygen sensor heater controlling
• Exhaust aftertreatment

	Ignition ON, function		GF07.10-P-1000OGF
	Starting, function		GF07.10-P-1001OGF
	Ignition OFF, function		GF07.10-P-1002OGF
	Fuel supply, function		GF07.10-P-1003OGF
	Injection regulation, function		GF07.10-P-1004OGF
	Rpm control, function		GF07.10-P-1008OGF
	Alternator interface function		GF07.10-P-1009OGF
	Smooth running control, function		GF07.10-P-1011OGF
	Thermal management, function		GF07.10-P-1012OGF
	Torque coordination, function		GF07.10-P-1013OGF
	Overrun mode fuel shutoff, function		GF07.10-P-1014OGF
	Engine limp-home mode, function		GF07.10-P-1019OGF
	On-board diagnosis, function		GF07.10-P-1020OGF
	Engine timing start-stop function	Engine 642.8 in model 166 as of model year 2016 with code B03 (ECO start/stop function) Engine 642.8 in model 292 with code B03 (ECO start/stop function)	GF07.10-P-1041OGF
	Charging, function		GF09.00-P-2000OGF
	Exhaust treatment function		GF14.00-P-3000OGF
	Exhaust gas recirculation, function		GF14.20-P-3000OGF
	Preheat, function		GF15.20-P-3005OGF
	Overview of system components for common rail diesel injection (CDI)		GF07.16-P-9997OGF