5.7.2. Check of a control system of the engine

The electronic control unit is constantly powered from the rechargeable battery through the conclusion "38" protected by the safety lock No. 41 (7,5 A) which is in the assembly block of a motor compartment. At turning on of the switch of devices and a starter tension from the rechargeable battery arrives on conclusions "25" both "37" EBU sockets and a conclusion "7" electromagnetic valves of a stop of the diesel on the chain protected by the fuse No. 25 (10 A) which is in the assembly block of interior of the car. Besides, the allowing signal from an immobilizer through a conclusion "30" connects on "weight" a conclusion "106" blocks of the EBU socket that leads to short circuit of a power chain of the relay of inclusion before - and poststarting heating. At operation of the specified relay tension moves on heating candles during the time depending on temperature of cooling liquid. Gets permission to launch of the EBU engine through a conclusion "28" on the chain protected by the fuse No. 26 (7,5 A) which is in the assembly block of interior of the car. On cars with the conditioner during the operation of the engine idling a conclusion "8" blocks of the EBU socket are connected on "weight" on the chain protected by the fuse No. 6 (7,5 A), food moves on the relay of turning on of the conditioner. At operation of the specified relay the compressor of the conditioner turns on and tension arrives on the electromagnetic valve of the accelerated idling on the chain protected by the fuse No. 30

(7,5 A). Inspections are carried out according to indications of tab. 3.15 — 3.17.

Order of connection of the control device to conclusions	Check conditions	Result of check, control values	Possible malfunction
Conclusion "38" sockets EBU and "weight"	The switch of devices and starter is switched off	U=Uak. baht.	Break of a wire between the rechargeable battery and a conclusion "38" EBU sockets. The safety lock No. 41 burned down. Unreliability of connections in the assembly block of a motor compartment
Conclusions of "1" socket of the relay of inclusion of prestarting heating and "weight"	The same	The same	Break of a wire between a conclusion of "1" relay of prestarting heating and the rechargeable battery. The safety lock No. 41 burned down
Conclusion "2" sockets of the relay of inclusion of prestarting  heating  and "weight"	»	»	The relay of inclusion of prestarting heating is faulty
Conclusion "106" sockets EBU and "weight"	»	»	Break of a wire between a conclusion "2" sockets of the relay of inclusion of prestarting heating and a conclusion "106" EBU sockets
Conclusion "3" sockets of the relay of inclusion of prestarting  heating  and "weight"	»	»	Break of a wire between the rechargeable battery and a conclusion "3" sockets of the relay of inclusion of prestarting heating. The safety lock "and" in the assembly block of a motor compartment burned down. Unreliability of connections in the assembly block of a motor compartment
Conclusion of "1" socket of the switch of devices and starter and "weight"	»	»	Break of a wire between the rechargeable battery and a conclusion of "1" socket of the switch of devices and a starter. The safety lock of "i" in the assembly block of a motor compartment burned down. Unreliability of connections in the assembly block of a motor compartment
Conclusions "3" sockets of the relay of turning on of the electromagnetic   coupling of the compressor of the conditioner and "weight"	»	»	Break of a wire between the rechargeable battery and a conclusion "3" sockets of the relay of turning on of the electromagnetic coupling of the compressor of the conditioner. The safety lock No. 30 in the assembly block of a motor compartment burned down. The safety lock "д" in the assembly block of a motor compartment burned down. Unreliability of connections in the assembly block of a motor compartment
Conclusion  of "1"  socket of an immobilizer      and "weight"	»	»	Break of a wire between the rechargeable battery and a conclusion of "1" socket of an immobilizer. The safety lock No. 24 in the assembly block of interior of the car burned down. Unreliability of connection of wires in the assembly block of interior of the car
Conclusion "2" and "3" sockets of the switch of devices and starter and "weight"	To turn a key in the switch of devices and a starter in the provision of "ASS", then in the provision of "ON"	»	The switch of devices and starter is faulty
Conclusions  "25",   "37" sockets EBU and "weight"	To turn a key in the switch of devices and a starter in the provision of "ON"	»	Break of a wire between the switch of devices and a starter and conclusions "25", "37" EBU sockets. The safety lock No. 25 in the assembly block of interior of the car burned down. Unreliability of connection of wires in the assembly block of interior of the car
Conclusion "2" sockets of an immobilizer and "weight"	The same	»	The immobilizer is faulty
Conclusion "30" sockets EBU and "weight"	»	»	Break of a wire between a conclusion "2" immobilizers and a conclusion "30" EBU sockets
Conclusion  "7"  sockets TNVD and "weight"	»	»	Break of a wire between the switch of devices and a starter and the electromagnetic valve of a stop of the diesel. The safety lock No. 25 in the assembly block of interior of the car burned down. Unreliability of connection of wires in the assembly block of interior of the car
Conclusion "5" sockets of the relay of inclusion of prestarting  heating  and "weight"	»	»	The relay of inclusion of prestarting heating is faulty
Wire of food of candles of an incandescence and "weight"	»	»	Break of the wire connecting a conclusion of "5" relays of prestarting heating and a glow plug
106 socket of EBU and "weight"	To turn a key in the switch of devices and a starter in the provision of "ON"	U=0	EBU is faulty
Conclusion "6" sockets of the switch of devices and starter and "weight"	To turn a key in the switch of devices and a starter in the provision of "ST"	U=Uak. baht.	The switch of devices and starter is faulty
Conclusion "28" sockets EBU and "weight"	The same	The same	Break of a wire between a conclusion "28" EBU sockets and a conclusion "5" sockets of the switch of devices and a starter. The safety lock No. 26 in the assembly block of interior of the car burned down. Unreliability of connections of wires in the assembly block of interior of the car
Conclusion of "1" socket of the relay of turning on of the electromagnetic coupling of the compressor of the conditioner and "weight"	The engine idles, the conditioner is switched off	»	Break of a wire between the switch of devices and a starter and a conclusion of "1" socket of the relay of turning on of the electromagnetic coupling of the compressor of the conditioner. The safety lock No. 6 in the assembly block of interior of the car burned down. Unreliability of connections of wires in the assembly block of interior of the car
Conclusion "2" sockets of the relay of turning on of the electromagnetic coupling of the compressor of the conditioner and "weight"	The same	»	The relay of turning on of the electromagnetic coupling of the compressor of the conditioner is faulty
Conclusion "8" sockets EBU and "weight"	»	»	Break of a wire between the relay of turning on of the electromagnetic coupling of the compressor of the conditioner and EBU. The coolant pressure sensor is faulty
Conclusion "5" sockets of the relay of turning on of the electromagnetic coupling of the compressor of the conditioner and "weight"	The engine idles, the conditioner is switched on	»	The relay of turning on of the electromagnetic coupling of the compressor of the conditioner is faulty
Conclusion of "1" socket of the electromagnetic valve of the accelerated idling and "weight"	The same	»	Break of a wire between a conclusion of "1" socket of the electromagnetic valve of the accelerated idling and a conclusion of "5" relays of turning on of the electromagnetic coupling of the compressor of the conditioner

The checked system element	Conclusions or points of connection of the device	Control values, result of check	Possible malfunction
Sensor of frequency of rotation of the engine	Conclusions "17", "23" and "36" EBU sockets	R = 1,6 Ohms	The sensor of frequency of rotation of the engine is faulty. Break of a wire between a conclusion "4" sockets of the sensor and conclusions "23", "36" EBU sockets. Break of a wire between a conclusion "5" sockets of the sensor and a conclusion "17" EBU sockets
Sensor of temperature of cooling liquid	Conclusions "15", "23" and "36" EBU sockets	Value of resistance at a temperature: 11,5kompri 15 °C; 5,6 kOhm at 0 °C; 3,7kompri 10 °C; 1,2 kOhm at 40 °C	The sensor of temperature of cooling liquid is faulty. Break of a wire between a conclusion of "1" socket of the sensor and a conclusion "13" EBU sockets. Break of a wire between a conclusion "2" sockets of the sensor and conclusions "23" and "36" EBU sockets
Electromagnetic valve of regulation of a corner of an advancing of injection of fuel	Conclusion "108" EBU sockets and case of the electromagnetic valve	R = 0,5 Ohms	The electromagnetic valve of regulation of a corner of an advancing of injection of fuel is faulty. Unreliability of connections in a bunch of wires
	Case of the electromagnetic valve of regulation of a corner of an advancing of injection of fuel and "weight"	R = <0,5 Ohms	Unreliability of contact in a point of connection of "mass" of the valve and TNVD
The electromagnetic valve of the accelerated idling	Conclusions "1" and "2" sockets of the valve	R = 39 Ohms	The electromagnetic valve of the accelerated idling is faulty
	Conclusion "2" sockets of the valve	R = <0,5 Ohms	-
Sensor of existence of a key in the lock of the switch of devices and starter	Conclusions "1" and "2" sockets of the sensor	The key is not inserted into the lock - R = infinity. The key is installed in the lock - R <0,5 Ohms	The sensor of existence of a key in the lock of the switch of devices and starter is faulty
Sensor of speed of the movement of the car	Conclusions "1" and "2" sockets of the sensor	R = 250 Ohms	The sensor of speed of the movement of the car is faulty
Points of connection of mass of EBU	Conclusion "26", "39", "101" and "195" sockets EBU and "weight"	R <0,5 Ohms	Break of a wire between conclusions "26", "39", "101" and "106" and "weight"

The checked system element	Conclusions or points of connection of the device	Control values, result of check	Possible malfunction
Sensor of temperature of cooling liquid	Conclusions "15", "23" and "36" EBU *	U = 5B	EBU is faulty
Sensor of frequency of rotation of the engine	Conclusions "17", "23" and "36" EBU **	Change of voltage from 0 to 5 V depending on the frequency of rotation of the engine	The sensor of frequency of rotation of the engine is faulty
The sensor of speed of the movement of the car (at the movement of the car)	Conclusions "1" and "2" sensors **	Change of voltage from 0 to 5 V depending on the speed of the movement of the car	The sensor of speed of the movement of the car is faulty
Electromagnetic valve of regulation of a corner of an advancing of injection of fuel	Conclusion "6" sockets TNVD and "weight" ***	U = 12 IN	EBU is faulty

Fig. 3.43. Numbering of conclusions of a block of wires of the EBU socket of the CD20 engine (rear view)

The NOTE to tab. 3.16 Inspections are carried out on conclusions of a block of wires of the EBU socket (see fig. 3.43), at the same time the plug socket has to be disconnected from EBU. During measurements plug sockets of the checked devices are not disconnected.

The NOTE to tab. 3.17 Inspections are carried out on conclusions of a block of wires of EBU (see fig. 3.43) at the joined shtekerny socket. For simplification of checks it is necessary to use the transitional block connected consistently between EBU and its shtekerny socket.

PREVENTIONS That during the checking and adjustment not to get injured COURT and not to put system knots out of action, follow the following rules: — do not allow operation of the engine if clips of wires are badly fixed on plugs of the rechargeable battery; — do not disconnect a wire from plugs of the rechargeable battery on the working engine; — disconnect the rechargeable battery from onboard network at its charging on the car from a foreign source of current; — do not start the engine by means of a foreign source more than 12 V; — do not separate the EBU socket at the included ignition; — before connection of plug sockets be convinced of absence of damage and oxidation traces on contacts of fork and rozetochny parts, and also of reliability of connection of sockets; — make sure available a rubber sealant of blocks and the fixing spring; — replace the damaged spring; — before work on the car with electric welding application including dot, separate the EBU socket. — remove EBU if the car is affected by temperatures from above 80 °C (for example, before the room of the freshly painted car in the drying camera); — before check of a compression in cylinders separate the plug socket (gray color on TNVD) the electromagnetic valve of a stop of the diesel; — do not check a wire and their connection by a control lamp; — do not check "for a spark" presence of tension in a chain; — disconnect the rechargeable battery before measurement of resistance of elements of electric equipment of the car; If the car is equipped with the autoradio tape recorder with a code, then before shutdown of the rechargeable battery remember a code of turning on of the autoradio tape recorder. When checking it is forbidden to attach tips of lengthening wires of the control device to socket conclusions. It is necessary to shift a protective cover of a block and to attach tips from an entrance of wires to a block or to use a special terminal block. In the latter case marking of conclusions of a terminal block has to correspond to marking of conclusions of the EBU socket.

Before check COURT perform the works described below, and eliminate the malfunctions revealed at the same time:

— be convinced of normal work of a chain of launch of the engine: rechargeable battery, power wires and starter;

— be convinced available enough fuel of the corresponding quality, of the correct installation of the fuel filter, and also that the filter is not littered;

— check tightness of systems of recirculation of vapors of fuel and crankcase gases, and also a condition of hoses of system (should not be pressed);

— check system of air intake: pipelines and laying have to be tight, collars are tightened, the filtering element has to be pure; the system of recirculation of the fulfilled gases has to be serviceable, pipelines are tight;

— check a condition of a chain of prestarting heating: an integrity and compliance of wires to the recommended characteristics;

— the engine power supply system fuel has to be tight, dribbles in unions and pipelines are not admissible;

— be convinced of tightness of system of production of the fulfilled gases; check a state and adjustment of a cable of the drive of management of fuel supply: the course from an emphasis against the stop and ease of movement; control lever course length supply of fuel depending on the provision of a pedal;

— estimate technical condition of the engine: compression, installation of an initial corner of an advancing of injection of fuel, tightness of laying of a head of the block of cylinders, condition of TNVD, etc.