Technical data of engine management systems

	Engine code Engine management system
	AHL	ADP	ADR	AEB	AGZ	ACK/ALG
	Simos 2	Motronic 3.8.2	Motronic 3.8.2	Motronic 3.8.2	Motronic 3.8.2	Motronic 3.8.2
Idle speed, rpm	760–960	760–960	760–960	760–960	650–750	710–860
CO content, %	0,5	0,5	0,3	0,5	0,5	0,5
Maximum revolutions, rpm	6500	6500	6500	6500	6500	6500

Fuel pressure control

	Engine code Engine management system
	AHL	ADP	ADR	AEB	AGZ	ACK/ALG
	Simos 2	Motronic 3.8.2	Motronic 3.8.2	Motronic 3.8.2	Motronic 3.8.2	Motronic 3.8.2
Fuel pressure at idle speed:
– vacuum hose
• connected, bar	3,5	3,5	3,5	3,5	2,5	3,5
• disconnected, bar	4,0	4,0	4,0	4,0	3,0	4,0
Pressure in the fuel system 10 minutes after turning off the engine, bar	2,5	2,5	2,0	2,0	2,0	2,2

Fuel injectors

	Engine code Engine management system
	AHL	ADP	ADR	AEB	AGZ	ACK/ALG
	Simos 2	Motronic 3.8.2	Motronic 3.8.2	Motronic 3.8.2	Motronic 3.8.2	Motronic 3.8.2
Productivity, ml/30 sec	–	85–105	85–105	130–150	90–125	90–125
Resistance, Ohm	14–17	12–15	12–15	12–15	14–17	15–21,5

On vehicles with gasoline engines, various engine management systems are installed.

Engine	Engine management system
1,6-I AHL	Simos 2
1,6-I ADP	Motronic 3.2
1,8-I, 2,3-I	Motronic 3.8.2
2,8-I (V6)	Motronic 3.8.2

The use of an electronic engine management system has the following advantages:

• provides optimal fuel supply to the engine in all operating modes, resulting in reduced fuel consumption while maintaining the dynamic characteristics of the car;
• due to more complete combustion of fuel, as well as the use of a catalyst, the emission of harmful substances along with exhaust gases decreases;
• since the electronic engine management system determines and records faults in the memory, the search and detection of faults is significantly accelerated;
• the engine management system in all operating modes sets the optimal ignition timing, the moment and the amount of fuel supplied to the engine. Also, the engine management system interacts with other vehicle systems, in particular, with the automatic transmission control system or with the anti-theft system.

Engine management components are very reliable and virtually maintenance free. During maintenance, it is only necessary to replace the air filter and spark plugs. Since it is necessary to use complex expensive equipment to check, adjust and repair the engine control system, this work must be done at a specialized service station.


During the operation of the car, it is not required to adjust the idle speed and the CO content in the exhaust gases.

Warning: When working on the ignition system with the ignition on, care must be taken, as you can get an electric shock from the high-voltage part of the ignition system. People with a pacemaker are not recommended to check and repair the engine management system. Switch off the ignition before disconnecting or connecting any element of the ignition system or tester probes.

Warning: The fuel system is under constant pressure, even after the engine has been switched off, so all work on the fuel system must be relieved of pressure.

Warning: To prevent the possibility of accidental short circuits and damage to the electronic components of the engine control system, always remove the ground wire from the battery.

Before performing any work on the engine management system, recall the malfunctions recorded in it. Also check the tightness of the fuel system and the air supply system to the engine.

Normal operation of the engine management system is possible only if the voltage in the vehicle network is not lower than 11.5 V.

If, after working on the engine management system, the engine starts and stops after a short time, the engine may be switched off by the anti-theft system. In this case, recall the malfunctions recorded in the memory and, if necessary, adjust the engine management system.