Diesel injection system with electronic diesel control (EDC) diagnosis basic knowledge · ad0712w2002a · Mercedes-Benz WIS

AD07.12-W-2002A

Diesel injection system with electronic diesel control (EDC) diagnosis basic knowledge

5.12.97

ENGINE 445.924 with CODE (MC1) Engine 441, 180 kW (245 hp) 2100 rpm Euro 2

ENGINE 445.924 /925 /941 with CODE (MC1) Engine 441, 180 kW (245 hp) 2100 rpm Euro 2

ENGINE 445.926 /927 /928 /933 /936 with CODE (MC2) Engine 441, 200 kW (272 hp) 2100 rpm Euro 2

ENGINE 445.929 /930 /931 with CODE (MC3) Engine 441, 230 kW (313 hp) 2100 rpm Euro 2

ENGINE 445.929 with CODE (MC3) Engine 441, 230 kW (313 hp) 2100 rpm Euro 2

ENGINE 445.920 /922 with CODE (MC4) Engine 441, 250 kW (340 hp) 1900 rpm Euro 2

ENGINE 445.920 /921 /923 with CODE (MC4) Engine 441, 250 kW (340 hp) 1900 rpm Euro 2

ENGINE 446.924 /925 /926 /927 /928 /929 /930 /931 with CODE (MC5) Engine 442, 280 kW (381 hp) 1900 rpm Euro 2

ENGINE 446.922 /923 /935 /936 /939 /940 /941 /942 /943 /948 with CODE (MC6) Engine 442, 320 kW (435 hp) 1900 rpm Euro 2

ENGINE 446.920 /921 with CODE (MC7) Engine 442, 390 kW (530 hp) 1900 rpm Euro 2

ENGINE 446.932 /933 with CODE (MC8) Engine 442, 390 kW (530 hp) 2100 rpm Euro 2

 Danger!	Hazard from high voltage during electric welding. Risk of explosion from welding in the area of easily ignited substances. Risk of injury from weld spatter and UV light during welding. Risk of poisoning from inhaling weld vapors.	Use insulating bases. Wear protective clothing, eye protection and protective mask. Keep easily ignited substances away from the hazardous area. Use extraction system.	AS00.00-Z-0007-01A
	Never start engine unless battery is properly connected (battery tightened). Never disconnect batteries when engine is running. Separate batteries from vehicle electrical system for quick-charging and refere to operating instructions of quick-charger.
	Incorrect polarity of the power supply can destroy the EDC control unit (Z37) (e.g. incorrect polarity of batteries. Do not separate or plug in connector at EDC control unit (Z37) unless the ignition is switched off. Remove control units at temperatures above +80 °C (drying oven).
	Do not perform any measurements at the contact point of plug connections with unsuitable tools (test probes, ends of wires etc.). This can result in unintentional short circuits and in subsequent contact problems as a result of the formation of contact resistances. Always use the matching test cables from the connection set (201 589 00 99 00) for such measurements.
	When using the socket box, create only the connections described in the test instructions, incorrect connections can destroy the control unit or the sensors.
	Do not use a quick-charger for starting the engine (jump-starting aid). Jump-start engine only with separate batteries.
	It is essential to tighten the union nuts at the engine cable harness to the specified tightening torque.
	Diesel injection system with electronic diesel control (EDC) diagnosis operational check	 For safety reasons - after installing a new control sleeve injection pump, - and after repairs to components of the emergency stop (ELAB, engine brake and constant throttle), if it is possible that further faults exist at the EDC system, an operational check must be carried out with the HHT (menu "Actuations") before starting the engine.	AD07.12-W-3001A
	Cables, plug connections and fuses are also covered by the test. It may be necessary to carry out further individual tests together with the applicable wiring diagram in order to determine the exact point (wiring harness / cable / plug connection) of a fault source (open circuit, short to ground, poor contact etc.).
	Removing, installing, parameterizing electronic diesel control (EDC) control unit		AR30.16-W-1002A
	Electronic diesel control (EDC) complete function		GF07.12-W-0002A
	Connecting and using test equipment		AD00.00-W-1000CZ
	Wiring diagram of electronic diesel control (FMR and EDC)	See Workshop Manual Electrical System Volume 4
	EDC diagnosis tools		AD07.12-W-2002-01A
	Notes on fault codes, actual values and parameters EDC		AD07.12-W-2002-02A
	Notes on reading fault memory EDC		AD07.12-W-2002-03A
	Notes on reading additional fault information EDC		AD07.12-W-2002-04A
	Connection diagram socket box control module disconnected EDC		AD07.12-W-2002-05A
	Connection diagram socket box control module connected EDC		AD07.12-W-2002-06A

Referenced documents

ad0000w1000cz Connection and use of test equipment
ad0712w200201a EDC diagnosis tools
ad0712w200202a Notes on fault code, actual values and parameters EDC
ad0712w200203a Notes on reading fault memory EDC
ad0712w200204a Notes on reading additional fault information EDC
ad0712w200205a Connection diagram socket box control module disconnected EDC
ad0712w200206a Connection diagram socket box control module connected EDC
ad0712w3001a Diesel injection system with electronic diesel control (EDC) diagnosis operational check
ar3016w1002a Removing and installing, parameterizing electronic diesel control (EDC) control unit
as0000z000701a The high voltage used for electric welding presents a lethal hazard. Risk of explosion from welding in areas close to highly inflammable materials. Risk of injury from weld splatter and UV-light when welding. Risk of poisoning from
gf0712w0002a Electronic Diesel Control (EDC) function