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

Engine All (4xWD) 

Engine All (CAR) 

Courtesy of MERCEDES-BENZ USA

Example illustration combustion engine control unit 

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
	Pressure sensor downstream of air filter, basic function		GF07.04-P-2003A
	Intake manifold pressure sensor, basic function	Engine 282	GF07.04-P-2008A
	Pressure sensor upstream of throttle valve, basic function	Engine 282	GF07.04-P-2009A
	Hot film mass air flow sensor, basic function	Engine 608, 654, 656 All models (cars) Engine 656 All models (off-road vehicles)	GF07.07-P-2000A
	Charge air pressure and temperature sensor, basic function	Engine 139, 176, 177, 254, 256, 260, 264, 274, 279, 608, 654, 656	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
	Camshaft Hall sensor, basic function		GF15.10-P-2001A
	Integrated starter alternator, basic function	Model all (CAR)	GF15.40-P-1000A
	Basic function of engine oil pressure and temperature sensor		GF18.40-P-2004A
	Component descriptions
	Engine management (MR) control unit, component description	Engine 176, 177, 256, 279, 656 in model 223	GF07.15-P-5003A
		Engine 254, 654 in model 206	GF07.15-P-5003C
		Engine 139, 177 in model 232	GF07.15-P-5003F
		Engine 139, 254, 654, 656 in model 254	GF07.15-P-5003H
		Engine 656 in model 464	GF07.15-P-5003J
		Engine 254, 654, 656 in model 214	GF07.15-P-5003K
		Engine 254, 256, 654 in model 236	GF07.15-P-5003S