Combustion Engine Control Unit, Basic Function - GF07.08-P-9890A

Engine All (4xWD) 

Engine All (CAR) 

Courtesy of MERCEDES-BENZ USA

Example illustration of engine 256 

Overview 

This document contains information on:

• General 
• Function 

General 

The combustion engine control unit is the central control unit for the engine management functions. It also performs gateway functions for other control units.

The combustion engine control unit is located in the engine compartment, usually on the combustion engine.

Function 

The combustion engine control unit intervenes in the following functions:

• Engine management
• Fuel system (fuel supply system, mixture formation, fuel preheating)
• Heat management
• Exhaust aftertreatment
• Charging

To execute these functions, the combustion engine control unit basically processes the following input factors:

• High-pressure side fuel pressure (fuel distribution)
• Low-pressure side fuel pressure
• Throttle valve position
• Fuel temperature
• Boost pressure
• Charge air temperature
• Coolant temperature
• Soot particulate filter pressure differential
• Crankshaft position
• Position of the camshaft
• Oil pressure
• Oil level, oil temperature, oil quality
• Low-pressure side exhaust gas recirculation temperature
• Position of low-pressure side exhaust gas recirculation actuator
• Position of high-pressure exhaust gas recirculation actuator
• Air mass
• Crash signal

The combustion engine control unit processes these input factors and basically transmits the following actuations:

• Throttle valve actuator
• Divert air switchover valve
• Fuel injectors
• For diesel engines: glow output stage
• Boost pressure control flap
• Low-pressure/high-pressure exhaust gas recirculation actuator
• Quantity control valve
• Alternator

	Additional basic functions
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	Charge air Pressure and temperature sensor, basic function	Engine 139, 176, 177, 254, 256, 260, 264, 274, 279, 608	GF09.41-P-2000A
	Charge air temperature sensor downstream of throttle valve, basic function	Engine 282	GF09.41-P-2002A
	Boost Pressure control flap actuator, basic function		GF09.50-P-2001A
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	Belt-driven starter alternator, basic function	Engine all in model all	GF15.40-P-1001A
	Engine oil temperature sensor, basic function	Engine 133	GF18.30-P-2000A
	Basic function of engine oil Pressure and temperature sensor		GF18.40-P-2004A
	Component descriptions
	Engine management (MR) control unit, component description	Engine all in model 223	GF07.15-P-5003A
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