The system of injection of fuel represents the difficult device with many elements. Its diagnostics and repair requires the special equipment, use of difficult multistage techniques and considerable practical experience. Therefore it is the best of all to charge diagnostics and repair to the specialized service stations and car repairs of Volkswagen having for this purpose the special equipment.

System of the central injection  of Mono-Jetronic fuel

Fig. 5.23. System of injection Mono-Jetronic: 1 – fuel pump; 2 – fuel tank; 3 – fuel filter; 4 – nozzle; 5 – air flowmeter; 6 – control unit; 7 – proofreader of idling; 8 – potentiometer of a butterfly valve; 9 – relay; 10 – the ignition switch, 11 – the accumulator; 12 – butterfly valve; 13 – ignition distributor; 14 – engine temperature sensor; 15 – lambda sensor; 16 – pressure regulator

The system of injection of Mono-Jetronic fuel provides electronic faltering injection of gasoline in an inlet collector. At the same time the Mono-Jetronic system unlike systems of injection Digifant and K-Jetronic has one is central the located nozzle of 4 (fig. 5.23) for all cylinders. Distribution of fuel in separate cylinders happens, as in engines to the carburetor, – through an inlet collector. Air is soaked up by the engine via the air filter and gets to the injection device. In the case of an injector there is a butterfly valve operated by a flexible cable 12. The angle of opening of a butterfly valve is fixed by a potentiometer of the 8th butterfly valve, and transmits a signal to the control unit 6, depending on instant value of turns of the engine and defines amount of the soaked-up air.

The control unit regulates by the measured amount of air and data on the frequency of turns of the engine from system of ignition the moment and the number of injection. The longer the nozzle is open, the amount of injectable fuel is more.

Additional sensors are responsible for correctly measured amount of fuel in the different modes of the movement.

The potentiometer of the 8th butterfly valve reports to the control unit 6 about the provision of a butterfly valve idling.

The control unit slightly opens or covers through a servomotor, a butterfly valve and thus supports stable turns of idling.

The sensor of temperature 14 on a connector of cooling liquid takes engine temperature.

The air temperature sensor in the reception channel takes air temperature.

The lambda sensor 15 measures the content of oxygen in a stream of exhaust gases. The control unit, on its signal, supports the content of harmful emissions in exhaust gases at the lowest level.

At cars with the catalyst the composition of exhaust gases is supported at the level providing the best reburning in the catalyst.

Fig. 5.24. An arrangement of elements of system of injection of Mono-Jetronic in a motor compartment: 1 – injector; 2 – temperature regulator; 3 – ECU control unit; 4 – fuel nozzle; 5 – fuel pressure regulator; 6 – the socket of a heater of the air coming to the engine; 7 – control bulb; 8 – vacuum adjustment of a corner of an advancing of ignition; 9 – potentiometer of a butterfly valve; 10 – socket lambda sensor; 11 – water reflector of a potentiometer of a butterfly valve; 12 – sensor of temperature of system of injection (blue); 13 – a heater thermoswitch in an inlet collector (red), 14 – a potentiometer of provision of a butterfly valve; 15 – air temperature sensor; 16 – the electromagnetic valve of the filter with absorbent carbon (gray); 17 – electromagnetic valve; 18 – additional resistor of an injector; 19 – electric socket of a potentiometer of provision of a butterfly valve; 20 – throttle shock-absorber

The arrangement of elements is shown in fig. 5.24 .

System of the central injection  of Mono-Motronic fuel

The system of injection of Mono-Motronic fuel unlike Mono-Jetronic is executed in one block. Thanks to combination of system of ignition with system of injection, ignition works under various operating conditions of the engine better. The majority of the carried-out works and instructions for the Mono-Jetronic system concern as well Mono-Motronic.

Electronics of the monitor registers malfunction in system of injection. This malfunction after the first emergence, registers in memory. At the same time on an additional guard the control bulb lights up, signaling that malfunction is written down. If malfunction arises only once, for example at unreliable contact, then she all the same registers in memory of the monitor.

System of the distributed  Digifanf fuel injection

Fig. 5.25. System of injection of fuel: 1 – fuel tank; 2 – fuel pump; 3 – fuel filter; 4 – fuel distributor; 5 – pressure regulator; 6 – control unit; 7 – nozzle; 8 – nozzle of start of the cold engine; 9 – screw of adjustment of turns of idling; 10 – potentiometer of provision of a butterfly valve; 11 – butterfly valve; 12 – air flowmeter; 13 – temperature sensor; 14 – thermotime sensor; 15 – ignition distributor; 16 – regulator of turns of idling; 17 – accumulator; 18 – ignition lock; 19 – relay

The system of injection of Digifant fuel is developed by VW and is established on engines with alphabetic reference of PB, PF, PG and 2E. The block 19 (fig. 5.25) exercises control of ignition and injection at the same time. The injecting part generally corresponds to the L-Jetronic system of BOSCH. The system of injection of Digifant fuel injects fuel into an inlet collector in front of each inlet valve. Unlike Mono-Jetronic the Digifant system has a separate nozzle for each cylinder.

Fuel gets from the fuel tank 1 electric fuel pump 2 and via the fuel filter 3 moves through the fuel highway to nozzles 6, 10.

The regulator of pressure of the 4th fuel highway monitors constant maintenance of pressure in fuel system.

The quencher of fluctuations in the regulator of pressure 4 reduces fluctuations of pressure in the fuel return pipeline.

Air is soaked up by the engine via the air filter, an inlet collector and its volume measured by a flowmeter of the 15th stream of air.

In the case of a flowmeter of air there is a gate which when passing an air stream deviates. The corner of a deviation of the gate serves as an air stream measure. From a potentiometer on a gate axis the signals corresponding to position of the gate come to the control unit.

The control unit 19 regulates time and amount of injectable fuel according to the measured amount of air and frequency of turns of the engine. The longer the nozzle is open, the more fuel is injected. Additional sensors allow to dose precisely fuel in the different operational modes.

The distributor of fuel 5 stabilizes idling turns, especially during warming up of the engine or if the engine is loaded by the included electric consumers.

The potentiometer of the 18th provision of a butterfly valve is located directly on a shaft of a butterfly valve 12. It signals the control unit about the provision of a butterfly valve at turns of idling and full capacity. It concerns control of the fuel supply switch as contacts the regulator of 13 turns of idling are still closed, at the turns of the engine exceeding 1500 min.-1 (compulsory idling), the control unit has to stop supply of fuel in the engine.

The lambda sensor, installed in cars with the adjustable catalyst, measures the content of oxygen in exhaust gases and sends the corresponding electric signals to the control unit. The control unit changes quality of air-fuel mix so that exhaust gases were in the best way burned up in the catalyst. If the sensor participating in regulation process fails, the control unit switches to the emergency program, interfering thereby with breakage of the engine, but, allowing to continue the movement. At the same time ignition changes on more later and the power and acceleration performance of the engine falls.

Fig. 5.26. An arrangement of elements of system of injection of Digifant in a motor compartment: 1 – case of a butterfly valve; 2 – TSZ-H ignition switchboard; 3 – idling switch; 4 – control unit; 5 – switch of an open butterfly valve; 6 – valve of stabilization of turns of idling; 7 – socket lambda sensor; 8 – inlet collector; 9 – valve of adjustment of pressure; 10 – ignition coil; 11 – sensor of temperature of cooling liquid (black); 12 – the ignition distributor, 13 – the sensor of temperature of system of injection (blue); 14 – nozzles; 15 – detonation sensor; 16 – fuel distributor; 17 – the adjustment screw WITH; 18 – air filter; 19 – air stream measuring instrument; 20 – pressure regulator; 21 – screw of adjustment of turns of idling; 22 – air inlet

The provision of elements of a power supply system is shown in fig. 5.26 .

System of the distributed injection of K-Jetronic fuel

Fig. 5.27. System of injection K-Jetronic: 1 – fuel tank; 2 – fuel filter; 3 – fuel accumulator; 4 – fuel pump; 5 – rechargeable battery; 6 – ignition switch; 7 – switch of the fuel pump; 8 – ignition distributor; 9 – thermoswitch; 10 – the valve of launch of the cold engine, 11 – a spark plug; 12 – nozzle; 13 – inlet pipe; 14 – air valve of launch of the cold engine; 15 – case of a butterfly valve; 16 – butterfly valve; 17 – air consumption measuring instrument; 18 – measuring instrument plate; 19 – cap; 20 – fuel distributor; 21 – valve of warming up of the engine; 22 – fuel distributor piston; 23 – pressure regulator; 24 – measuring instrument plate lever; 25 – persistent lever of the piston of the distributor of fuel; 26 – screw of adjustment of quality (structure) of mix; 27 – screw of adjustment of amount of mix

Fig. 5.28. An arrangement of elements of system of injection of K-Jetronic in a motor compartment: 1 – pressure sensor; 2 – screw of adjustment of turns of idling; 3 – sensor of provision of a butterfly valve; 4 – TSZ-H ignition switchboard; 5 – control unit; 6 – case of a butterfly valve; 7 – ignition distributor; 8 – ignition coil; 9 – valve of stabilization of turns of idling; 10 – control unit of turns of idling and fuel supply shutdown; 11 – sensor of temperature and thermotime sensor; 12 – valve of cold start; 13 – heating valve; 14 – сапун case; 15 – nozzle; 16 – the gate of heating of the air coming to the engine; 17 – fuel distributor; 18 – the screw of adjustment of contents WITH; 19 – air filter; 20 – fuel supply shutdown valve

The system of injection of K-Jetronic fuel is a system of mechanical consecutive injection of fuel in an inlet collector in front of inlet valves. Fuel gets from the fuel tank of 1 (fig. 5.27) , the giving fuel pump and the main fuel pump 4 located in it, and moves via the fuel accumulator 3 in the fuel filter 2, to the fuel 20 distributor. The distributor of fuel distributes and gives to cylinders fuel through nozzles 12 according to amount of the measured air. Additional sensors allow to dose precisely fuel at various temperatures and service conditions (fig. 5.28) .

The fuel accumulator holds fuel under pressure a long time, even after switching off of the engine that interferes with formation of bubbles and improves start of the hot engine.

The switch of the fuel pump 7 (see fig. 5.27 ) gives current to the fuel pump 4 and the valve of 21 warmings up of the engine. The switch of the fuel pump interrupts giving of current to the pump, at switching off of ignition and lack of impulses of ignition (the engine is switched off, ignition is switched off). Besides, the switch interrupts supply of fuel at excess by the engine of the maximum turns.

At start of the cold engine the valve 10 of launch of the cold engine injects additional amount of fuel into an inlet collector, for start simplification.

The thermoswitch 9 regulates duration of injection of the valve 10 of launch of the cold engine.

The regulator of pressure 23 supports pressure in system about 470-540 kPa.

The regulator of warming up enriches mix during warming up.

The electric control unit operates valves of shutdown of supply of fuel and stabilization of turns of idling.

System of the distributed KE-Motronic fuel injection

The system of injection of KE-Motronic fuel is the combined system of ignition and injection, with the general control unit. Nozzles are mechanically arranged as and in the K-Jetronic system (see fig. 5.27 ), but in addition have electronic control. Thanks to electronics there is a management of the number of injection by means of additional sensors which more stoutly and quicker collect and process information. Besides, the lambda regulation at operation of the catalyst is facilitated. When using the KE-Motronic system need for the warming up regulator, the disconnecting valve and system of adjustment of pressure disappears.

The electronic control unit regulates a fuel dose in various operational modes of the engine via the electrohydraulic regulator of pressure which is located on the distributor of amount of fuel. It means that the monitor monitors enrichment of mix at cold start and warming up of the engine, enrichment of mix at acceleration and full capacity. Besides, it blocks access of fuel at the movement on inertia.

The membrane regulator of pressure, on the distributor of amount of fuel, supports pressure in system from 610 to 660 kPa.

The filter of absorbent carbon interferes with that harmful vapors of fuel got from the fuel tank into the atmosphere, the evaporating fuel collects in the container with absorbent carbon. At the movement of couple under control of two magnetic valves move in the engine for combustion again.

The memory device in the control unit distinguishes the appeared malfunction and writes down it. At failure of the important sensor, the control unit switches to the reserve program (using average codes) that the engine did not stop.

Fig. 5.30. An arrangement of elements of system of injection of KE-Motronic in a motor compartment: 1 – socket lambda sensor; 2 – case of a butterfly valve; 3 – control unit; 4 – a pipe of measurement of contents WITH; 5 – valve of stabilization of turns of idling; 6 – output block; 7 – ignition coil; 8 – the distributor with Hall's sensor; 9 – relay of the fuel pump; 10 – connection of the sensor, ignition advancing corner; 11 – detonation sensor socket; 12 – temperature sensor; 13 – valve of cold start; 14 – sensor of a detonation 1; 15 – injector; 16 – sensor of a detonation 2; 17 – the gate of heating of the air coming to the engine; 18 – pressure regulator; 19 – fuel distributor; 20 – coal filter; 21 – air filter; 22 – potentiometer; 23 – pressure regulator; 24 – air flowmeter; 25 – valve of the coal filter; 26 – spark plug; 27 – sensor of provision of a butterfly valve

The arrangement of elements of system of injection of KE-Motronic in a motor compartment is shown in fig. 5.30 .

Control system of the Simos engine

The device and the principle of action of a control system of the Simos engine are similar to the Digifant system.

Fig. 5.29. Arrangement of elements of system Simos engine: 1 – electromagnetic valve of a canister of charcoal; 2 – air stream measuring instrument; 3 – oxygen sensor socket; 4 – throttle case; 5 – ECU block; 6 – injector; 7 – fuel pressure regulator; 8 – ignition coil; 9 – speedometer drive sensor; 10 – detonation sensor socket; 11 – socket of a plait of wires; 12 – sensor of frequency of rotation of a bent shaft of the engine; 13 – socket of the sensor of frequency of rotation of a bent shaft of the engine; 14 – ignition distributor; 15 – sensor of temperature of cooling liquid; 16 – detonation sensor; 17 – connection with weight; 18 – the sensor of temperature of the air coming to the engine; 19 – charcoal filter

The arrangement of elements of system of injection of Simos in a motor compartment is shown in fig. 5.29 .

Precautionary measures during the work with the injection device

At removal and installation of elements of systems of injection it is necessary to follow the following rules:

– do not start the engine at unreliably connected rechargeable battery. Disconnect sockets of system of ignition and injection or connect only at the switched-off ignition. It concerns also measuring devices;

– start by means of the starting arrangement is admissible only within no more than 1 min., at a voltage no more than 16,5 V;

– do not disconnect the rechargeable battery from onboard network at the working engine, it can lead to failure of the control unit;

– before carrying out an inspection of electronic system of injection, it is necessary to be convinced of serviceability of system of ignition, it means that ignition and candles have to conform to technical requirements;

– during the work with system of injection be careful to prevent hit of dust and dirt in various components of system. It is not recommended to use compressed air or fleecy fabrics for cleaning of system.

PREVENTION During the work with mechanical parts of system of injection it is necessary to observe strict purity. Before dismantling it is necessary to wash out details gasoline. The system is under pressure. Therefore before replacement of details to reduce pressure, gradually weakening fastening on the valve of cold start.

Check and adjustment of turns of idling (XX) and quality of mix

Check and adjustment of turns of idling and quality of mix will require a tachometer and the analyzer of exhaust gases.

And quality of mix you carry out preparation for adjustment of turns of XX as follows:

– check and adjustment are carried out on the heated-up engine with correctly determined moment of ignition and serviceable system of production of the fulfilled gases;

– start the engine and leave to idle until temperature of oil reaches 80 °C. At the same time you watch that temperature of cooling liquid did not exceed normal as during check and adjustment the fan has to be switched off;

– kill the engine, disconnect everything consumers of energy (headlights, the radio tape recorder, the conditioner, etc.);

– disconnect and muffle a stopper a hose of ventilation of a case;

– connect a control tachometer and a gas analyzer;

– if fuel-supply lines were disconnected from nozzles or replaced new before check and adjustment of frequency of rotation of idling, increase frequency up to 3000 min.-1, then leave the engine to idle within 2 min. prior to check and adjustment;

PREVENTION The reason of increase in contents WITH not in adjustment, and in saturation by oil vapors from an engine case as a result of fluidifying of oil at heavy traffic on short distances. At long uniform motion on the flat area the amount of fuel in oil decreases, and contents WITH is normalized. It is also normalized after continuous (about 30 min.) the movements or after oil replacement

– the throttle zslonka has to be in the idling family way.

And quality of mix of system of injection of Digifant fuel carry out adjustment of turns of XX in the following order:

– at the switched-off ignition connect a tachometer and a gas analyzer of exhaust gases in compliance to instructions of the manufacturer;

Fig. 5.31. Ventilation of a case of the engine: 1 – a ventilation hose, 2 – temperature sensor socket

– disconnect a hose of ventilation of a case of 1 (fig. 5.31) from the valve of adjustment of pressure 9 (see fig. 5.26 ) and densely close a hose;

– start the engine and let's it work in the idling mode within one minute, then disconnect the blue socket from temperature sensor 20;

– by means of a cable of management of an accelerator open and close three times a butterfly valve. When opening a butterfly valve turns of the engine have to exceed 3000 min.-1;

Fig. 5.32. Adjustment of turns of idling and quality of mix: 1 – the screw of adjustment XX, 2 – the screw of adjustment of quality of mix

– transfer the engine to the idling mode, and check idling turns, and quality of mix (fig. 5.32) . For adjustment remove a cap and the corresponding tool, turn the screw of adjustment of turns of idling 1 and the screw of adjustment of quality of mix 2 (SO);

– connect temperature sensor socket, then sharply three times open a butterfly valve (exceeding 3000 min.-1), transfer the engine to the mode of idling and repeatedly check turns of idling and quality of mix (SO);

– at connection of a hose of ventilation of a case contents WITH can increase;

– on the PF engine check a lambda sensor: disconnect pressure regulator hose from the throttle case, contents WITH has to increase for a moment, then will go down to normal value;

– if the frequency of idling and maintenance WITH are satisfactory, establish into place hoses and disconnect a tachometer and a gas analyzer;

– if adjustment does not give positive effect, check the idling switch (cars with the mechanical transmission) or a potentiometer of provision of a butterfly valve (cars with the automatic transmission) on the special equipment.

And quality of mix of system of injection of Mono-Jetronic fuel carry out adjustment of turns of XX in the following order:

– connect a tachometer and a gas analyzer of exhaust gases according to instructions of the manufacturer;

– start the engine in the mode of turns of idling;

– check, turns of idling and maintenance WITH;

– if turns of idling and maintenance WITH differ from demanded, check that vacuum hoses had no cracks and damages and were reliably fixed;

– check the valve of system of the coal filter. If it is serviceable, check system of injection for service stations as the specialized diagnostic equipment connected to the socket of system of memory of damages for this purpose is required. Adjustment of turns of idling or contents WITH is not made.

And quality of mix of system of injection of K-Jetronic fuel carry out adjustment of turns of XX in the following order:

Fig. 5.33. The hoses of ventilation of a case disconnected from the case: 1, 2 – hoses, 3 – the case. The connector 4 has to be in a hose 2

– disconnect hoses of ventilation of 1, 2 (fig. 5.33) of a case from a sapun sideways of the block of cylinders, then disconnect a hose of ventilation of a case of small diameter together with the calibrated connector 4 from a hose of big diameter;

– include ignition, the adjusting valve of stabilization of idling has to publish noise and vibrate;

– connect a tachometer and a gas analyzer of exhaust gases according to instructions of the manufacturer;

Fig. 5.34. A socket detachment when checking turns of idling and contents WITH on system of injection K-Jetronic

Fig. 5.35. Adjustment of turns of idling and quality of mix: 1 – the screw of adjustment XX, 2 – the screw of adjustment of quality of mix

– disconnect the socket 1 (fig. 5.34) , then check the frequency of idling and maintenance WITH. For adjustment turn the screw 1 (fig. 5.35) of adjustment of turns of idling and the screw 2 adjustments of quality of mix;

– at connection of a hose of ventilation of a case contents WITH can increase;

– switch off the engine, disconnect the analyzer of exhaust gases and a tachometer.

PREVENTION The reason of increase in contents WITH not in adjustment, and in saturation by oil vapors from an engine case as a result of fluidifying of oil at heavy traffic on short distances. At long uniform motion on the flat area the amount of fuel in oil decreases, and contents WITH is normalized. It is normalized also after the continuous movement about 30 min. or after oil replacement.

And quality of mix of system of injection of KE-Motronic fuel carry out adjustment of turns of XX in the following order:

– check an ignition advancing corner;

– switch off ignition and connect a tachometer to the engine;

– connect a gas analyzer of exhaust gases according to instructions of the manufacturer;

– start the engine in the idling mode;

– check that turns of idling corresponded to demanded;

– on cars with the conditioner, turns of idling have to increase for 70 min.-1 at the switched-on conditioner;

Fig. 5.36. A hose detachment from the coal filter on system of injection KE-Motronic: 1 – coal filter

– check contents WITH. For adjustment, remove a hose from the coal filter 1 (fig. 5.36) , and disconnect hoses of ventilation of a case from a case (see fig. 5.33 );

– switch off ignition, disconnect the socket from the regulator of pressure 23 (see fig. 5.30 ) and connect the universal measuring device;

– include ignition, at the same time in a chain of management there has to be positive current, otherwise check electric wires;

– start the engine in the idling mode;

– rotate the screw of adjustment of contents WITH until current in the tsepena is established from 0 to 5 ma;

– before verification of the contents WITH for a short time increase engine turns.

Check and adjustment of the measuring instrument of a consumption of air (K-Jetronic and KE-Motronic system)

Carry out check and adjustment of the measuring instrument of a consumption of air (K-Jetronic and KE-Motronic system) in the following order:

start the engine and warm up it up to the working temperature;

– remove the air duct from the measuring instrument of a consumption of the air located in one block with the air filter;

– disconnect from the coil of ignition 8 (see fig. 5.28 ) a high-voltage wire, connect it to "weight" and include a starter for ten seconds;

Fig. 5.37. Air consumption measuring instrument: a = (0–0,5) mm

– lift a plate of 1 measuring instrument of a stream of air (fig. 5.37) and be convinced that it moves with an identical resistance on all length of the working course;

– if by bystry pressing of a plate of the measuring instrument of a stream of air there is resistance down, the block of the measuring instrument of a stream of air needs to be replaced;

for system of injection of K-Jetronic fuel:

Fig. 5.38. System of injection of K-Jetronic fuel: adjustment of provision of a plate of the measuring instrument of a consumption of air

– check that the top part of a sensitive plate was established flush with the top part of the diffuser or is 0,5 mm lower, and = 0–0,5 mm (see fig. 5.38 );

– in case of need, the provision of a plate can be adjusted, bending a bracket 2 fastenings under a plate (see fig. 5.37 );

for system of injection of KE-Motronic fuel:

– check a starting position of a plate of the measuring instrument of a consumption of air. The top part of a plate has to be 1,9-3,0 mm lower, and = 1,9–3,0 mm (see fig. 5.38 ) the upper edge of the diffuser;

– if adjustment is necessary, uncover the air filter and take the filtering element from the filter case;

Fig. 5.39. System of injection of KE-Motronic fuel: 1 – screw of adjustment of provision of a plate of the measuring instrument of a consumption of air

– adjust the provision of a plate, turning the regulator (fig. 5.39) ;

Fig. 5.40. System of injection of KE-Motronlc fuel: place of check of a free wheeling of a plate of the measuring instrument of a consumption of air

– check the size of a free wheeling of a plate of the measuring instrument of a consumption of air. Include a starter on 10 with, then lift an air consumption measuring instrument plate a little so that to feel a little resistance. The minimum free wheeling has to be 0,5 mm, and maximum – 3,0 mm to edge of the diffuser (fig. 5.40) ;

Fig. 5.41. System of injection of KE-Motronic fuel: adjustment of a free wheeling of the distributor of fuel; and = 0,6 mm

Fig. 5.42. Adjustment of the lock screw of a plunger of management: 1 – a nut of stuffed consolidation, and = 06 mm (distance from the lock screw to a nut shoulder)

– adjustment needs to be made at the fuel distributor, turning the lock screw of a plunger of management. The distance from the lock screw to a shoulder of a nut 1 has to be 0,6 mm ( fig. 5.41 and fig. 5.42 ). A quarter of a turn of the screw corresponds to 1,3 mm of movement of a plate. For increase in a free wheeling screw the lock screw, and for reduction turn out it;

– repeatedly check idling turns;

Fig. 5.43. Check of the main installation of the adjusting lever of the measuring instrument of a stream of air

– if the measuring instrument of a stream of air or the distributor of fuel were replaced, it is necessary to execute the main installation of the adjusting lever of the measuring instrument of a stream of air. For this purpose, using a depth gage, measure distance between the surface of contact of the distributor of fuel and a tip of the lever of adjustment (see fig. 5.43 ) which has to make 18,7–18,9 mm. For adjustment, turn the screw of adjustment of contents WITH, but keep in mind that the subsequent adjustment of the screw of contents WITH will change initial installation

Nozzles

Carry out check of nozzles of system of injection of Digifant fuel in the following order:

– for check of nozzles 14 (see fig. 5.26 ) it is necessary to use a sampler with a light-emitting diode;

Fig. 5.44. Connection to the socket of food of nozzles of a LED sampler on system of injection of Digifant fuel

– disconnect the socket of giving of tension to nozzles, connect to the socket a sampler with a light-emitting diode and include a starter (fig. 5.44) ;

– during the work of a starter and normal tension, the light-emitting diode will flicker. If it burns constantly, replace electric wires from the accumulator to the transmission and the tire of grounding of a control system Digifant;

– if the light-emitting diode does not burn, check a condition of electric wires of the control unit and a nozzle. Measure resistance of wires of food of a nozzle, having connected the socket to the measuring device. If resistance of 3,7-5,0 Ohms, so nozzles in the normal state. If resistance more than 5,0 Ohms, check separately each nozzle and the socket. Resistance of each nozzle makes 15–20 Ohms, and in the socket – no more than 0,5 Ohms;

– quality of dispersion of nozzles can be checked only for service stations with use of the special equipment

Carry out removal and installation of nozzles of system of injection of Digifant fuel in the following order:

– disconnect a wire from the negative plug of the rechargeable battery;

Fig. 5.45. Fuel highway and nozzles of system of injection of Digifant fuel: 1 – hose of fastening of the regulator of pressure of fuel; 2 – bolt; 3 – fuel pressure regulator; 4 – the feeding fuel-supply line, 5 – a returnable fuel-supply line; 6, 7 – an arm; 8 – insert; 9 – a sealing ring, 10 – a bolt; 11 – bracket; 12 – case of a plait of wires; 13 – fuel highway; 14 – nozzle; 15 – fuel hose; 16 – valve of adjustment of pressure; 17 – socket; 18 – sensor of temperature of cooling liquid; 19 – sensor of temperature of system of injection of fuel; 20 – socket; 21 – hose

– disconnect an electrical wiring of 12 (fig. 5.45) from the fuel highway 13;

– take off pressure in fuel system. Unscrew the fuel 3 pressure regulator from the fuel highway. Disconnect the feeding 4 and returnable 5th fuel-supply lines from the regulator 3 and the fuel highway;

– turn off bolts of the 10th fastening of the fuel highway to a head of the block of cylinders and remove the fuel highway together with nozzles;

– disconnect sockets from nozzles 14;

– weaken a bracket of the 11th fastening of each nozzle and take nozzles from the fuel highway;

– you carry out installation to the sequences of the return to removal.

Carry out check of nozzles of system of injection of K-Jetronic and KE-Motronic fuel in the following order:

– nozzles can be checked only for service stations with use of the special equipment.

Carry out removal and installation of nozzles of system of injection of K-Jetronic and KE-Motronic fuel in the following order:

Fig. 5.46. Elements of system of injection of K-Jetronic fuel: 1, 5, 9 – electric connecting blocks; 2 – sealing ring; 3 – a fuel-supply line from the fuel pump; 4 – a tube of discharge of fuel in the fuel tank; 6 – thermoswitch of the valve of launch of the cold engine; 7 – cooling system branch pipe; 8 – valve of warming up of the engine; 10 – pressure regulator; 11 – adjusting washer; 12 – fuel distributor; 13 – air consumption measuring instrument; 14 – fuel distributor piston; 15 – sealing ring; 16 – cap; 17 – screw of adjustment of quality (structure) of mix; 18 – nozzle; 19 – inlet pipe; 20 – laying; 21 – valve of launch of the cold engine

– switch off ignition and pit pressure in fuel system, for this purpose weaken an inhaling of fastening of a bolt of a fuel-supply line to the valve 21 (see fig. 5.46 ) launch of the cold engine;

– collect by rags the flowed-out fuel and tighten a bolt;

– turn off a connecting nut, weaken a hose of system of injection of fuel on a nozzle 18 and take a nozzle from a stage on a head of the block of cylinders;

– turn off a nut and disconnect a nozzle from a toppivoprovod;

– for a nozzle otvorachivaniye from a head of the block of cylinders it is necessary to use the special VW 3135 tool;

– you carry out installation to the sequences, the return to removal, but at installation of a nozzle previously moisten a sealing ring 2 in gasoline.

Elements of system of injection of Digifant fuel

Carry out valve check of stabilization of turns of idling in the following order:

Fig. 5.47. System of injection of Digifant fuel: 1 – valves of stabilization of turns of idling

– the valve of stabilization of turns of idling is installed behind the case of a butterfly valve (fig. 5.47) . If at inclusion of ignition, the valve vibrates and publishes noise, so it is serviceable;

– disconnect the electric socket from the valve and measure by a tester resistance which has to make 3,5–4,5 Ohms;

– if the valve is serviceable, so there is a damage in electric conductings to the valve or in the control unit.

Lambda sensor carry out check in the following order:

– connect a gas analyzer to a measuring tube;

– start the engine in the mode of idling and let's it work within 2 min., then check contents WITH;

– disconnect a hose from the regulator of pressure 20 (see fig. 5.26 ) on the case of a butterfly valve and densely close it. At the same time contents WITH has to increase quickly, and then return to the measured level;

Fig. 5.48. System of injection of Digifant fuel: socket of wires of heating lambda sensor

Fig. 5.49. System of injection of Digifant fuel: serial connection of a wire a lambda sensor (black) with a positive and negative pole of the accumulator

– if value of contents WITH does not go down, disconnect a lambda sensor and the socket of wires of heating of the sensor (fig. 5.48) . Connect a wire between the block a lambda sensor and in turn to negative and positive conclusions of the accumulator (fig. 5.49) . Contents WITH has to increase and decrease serially. If contents WITH does not meet standard, the block of board or electric conducting are damaged and they need to be checked for HUNDRED;

– disconnect a gas analyzer and connect hoses and sockets.

The engine and enrichments at completely open butterfly valve carry out braking check in the following order:

– braking and enrichment at completely open butterfly valve are connected by the engine via the control unit;

Fig. 5.50. System of injection of Digifant fuel: 1 – opening of a butterfly valve; 2 – screw-driver

– start the engine at idling turns, then open a butterfly valve of 1 (fig. 5.50) and enclose the screw-driver 2 so that to increase engine turns up to 2000 min.-1. Turns of the engine have to change as the system of braking works with the engine;

– if the system of braking does not work with the engine, disconnect the electric socket from temperature sensor (blue), then connect contacts of the socket a wire piece. If turns of the engine change, the sensor of temperature is faulty, and it needs to be replaced;

– if engine turns still do not change, repeatedly connect the socket of the sensor of temperature and check electric conducting of the sensor of temperature or the switch of a butterfly valve. If they in working order, so the control unit is damaged.

Elements of system of injection of Mono-Jetronic fuel

Check of the switch of the single course / the adjusting valve carry out in the following order:

Fig. 5.51. System of injection of Mono-Jetronic fuel: 1 – lever of the drive of a butterfly valve; 2 – rod; 3 – shock-absorber; 4 – regulator lock-nut; 5 – switch of a butterfly valve; 6 – electric socket; 7 – valve of management

– include ignition, open and close a butterfly valve. The adjusting valve 7 (fig. 5.51) has to work twice. Otherwise, disconnect the electric socket, and connect a LED sampler to the socket. At the closed butterfly valve the LED sampler will light up, at opened — will go out;

– start the engine in the mode of turns of idling, then disconnect the socket and repeatedly connect it. Turns of the engine have to increase, and then decrease. Otherwise replace the adjusting valve;

– switch off ignition, disconnect the electric socket from the device of provision of a butterfly valve;

– using additional wires, connect accumulator poles to clips of the device of provision of a butterfly valve, at the same time the rod 2 has to move to 2,5 cm, then disconnect wires;

Fig. 5.52. Adjustment of the switch of idling and the valve on system of injection of Mono-Jetronic fuel: 1 – a nut of adjustment of the switch of idling and the adjusting valve, 2 – a block of the electric socket, and = 0,5 ±0,1 mm

– press a rod to the limiter and the probe check a gap (fig. 5.52) . If necessary adjust a gap a nut 4 (see fig. 5.51 ).

– connect a tester to the lower contacts of the electric socket 2 (see fig. 5.52 ). At installation of the probe the switch has to be opened, and after extraction of the probe the switch has to be closed (0 Ohms).

Carry out check of the resistor in the following order:

Fig. 5.53. Measurement of resistance on system of injection of Mono-Jetronic fuel: 1 – the resistor, 2 – the plug of the electric socket

– disconnect the electric socket 2 (fig. 5.53) of the resistor 1;

– connect a tester to contacts of the socket, the tester has to show presence of resistance of 3-4 Ohms.

Carry out check of the shock-absorber of a butterfly valve (cars with the mechanical transmission) in the following order:

– check that at the closed butterfly valve the lever 1 (see fig. 5.51 ) moved a rod 2 in the mm shock-absorber 3 by 4;

– otherwise, weaken a nut of the regulator 4 and install the shock-absorber so that the lever only concerned a rod;

– from this situation turn the shock-absorber on 4 1/4 turns to the lever.

Carry out check of the regulator of pressure in the following order:

– in connection with use of the special equipment, check needs to be carried out on HUNDRED.

Carry out check of the coal filter in the following order:

Fig. 5.54. Coal filter: 1 – electric socket (black); 2 – electric socket (gray); 3 – electromagnetic valve I; 4 – electromagnetic valve II; 5 – arm; 6 – hose; 7 – coal filter. Arrows A, B and C specify the direction of streams of ventilation, And yes In — at the switched-off ignition And — the electromagnetic valve I is switched off, temperature of cooling liquid is below 60 °C And, In and With — the electromagnetic valve I is switched on, temperature of cooling liquid is above 60 °C

– check a state and reliability of fastening of hoses and electric sockets (fig. 5.54) ;

– connect a tester to the black electric socket 1 and include ignition;

– the tester has to show voltage of 12 V;

– repeat the same operation with the gray electric socket 2;

– for check of the electromagnetic valve 3 include ignition and check that the valve is closed;

– at switching off of ignition the valve has to open;

– system effectiveness of the coal filter depends on the correct functioning of the Mopo-Jetronic control unit, a lambda sensor and other elements. Due to the use of the special equipment, check needs to be carried out at service station.

Elements of system of injection of K-Jetronic fuel

Carry out valve check of cold start and the thermotemporary switch in the following order:

– disconnect from the coil 10 (see fig. 5.26 ) ignitions a high-voltage wire and connect it to "weight";

Fig. 5.55. System of injection of K-Jetronic fuel: 1 – LED sampler; 2 – electric plug of the valve of cold start

– disconnect the electric plug from the valve of cold start and connect a LED sampler (fig. 5.55) to contacts ;

Fig. 5.56. System of injection of K-Jetronic fuel: 1 – thermotime switch; 2 – electric socket.

– disconnect the electric plug from the thermotemporary switch and connect contacts of a green-white wire (fig. 5.56) to weight . Do not connect contact of a red-black wire to "weight";

– include a starter, at the same time the LED sampler has to light up;

– connect the electric socket to the switch, leaving a green-white wire connected to "weight";

Fig. 5.57. System of injection of K-Jetronic fuel: 1 – nozzle of the valve of cold start; 2 – glass jar

– remove the valve of cold start and insert it into a glass jar. Include a starter, of the valve has to go out an equal stream in the form of a cone (fig. 5.57) ;

– wipe the valve and dry it within 1 min.;

– at the installed valve of cold start, but the disconnected contact of a wire, connect a LED sampler to two contacts of the socket;

– include a starter on 10 with, the LED sampler depending on temperature of the thermotemporary switch will be lit on 1–8 with;

Fig. 5.58. The chart of duration of turning on of the valve of cold start depending on temperature of cooling liquid

– dependence of duration of inclusion of a light-emitting diode on a sampler from temperature of cooling liquid is presented on the chart (fig. 5.58) .

Carry out check of enrichment of fuel in the mode of acceleration of the cold engine in the following order:

– enrichment of fuel works in the mode of acceleration of the cold engine only when the switch of the mode of starting supply of fuel, the sensor of pressure of a diaphragm and the switch of a butterfly valve are closed;

– remove from the coil 10 (see fig. 5.26 ) ignitions and connect a high-voltage wire to weight;

– disconnect the electric plug from the valve of cold start and connect a LED sampler to contacts in the socket. Start the engine in the idling mode, at the same time the LED sampler should not burn;

– quickly open a butterfly valve, at the same time the LED sampler has to light up quickly (on 0,4 c).

Carry out check of the sensor of pressure of a diaphragm in the following order:

– disconnect the electric plug from pressure sensor;

– start the engine in the idling mode;

connect a tester to two contacts on the switch, at the same time resistance has to be equal to infinity, i.e. contacts are opened;

quickly open a butterfly valve, at the same time resistance has to decrease quickly.

Carry out check of the switch of a butterfly valve in the following order:

Fig. 5.62. A butterfly valve and the switch of a butterfly valve on cars with the mechanical transmission: 1 – switch; 2 – electric plug

disconnect the electric plug 2 (see fig. 5.62 ) from the switch of 1 butterfly valve;

– connect a tester to two contacts;

– at the closed butterfly valve, resistance has to equal infinity;

Fig. 5.59. System of injection of K-Jetronic fuel. Check of a gap between the limiter of idling and the lever of a butterfly valve: 1 – adjusting screws

– slowly open a butterfly valve, before click of contacts of the switch. At this moment resistance has to equal infinity, and the gap between the limiter of idling and the lever of a butterfly valve has to make 0,1 mm (fig. 5.59) ;

Fig. 5.63. A butterfly valve and the switch of a butterfly valve on cars with the automatic transmission: 1 – electric socket of a potentiometer; 2 – potentiometer; 3 – electric socket of the switch

– in case of need adjust the switch (see fig. 5.63 ).

Carry out check of the heater in the following order:

– disconnect from the coil of ignition and connect a high-voltage wire to weight;

Fig. 5.60. System of injection of K-Jetronic fuel. Check of giving of the feeding tension and resistance of the heater

– disconnect the electric plug 2 (fig. 5.60) from the heater and connect a LED sampler to contacts in the socket;

– include a starter, at the same time the LED sampler has to light up;

– check the heater 1 element resistance which has to make 20–26 Ohms.

Carry out check of the main installation of a butterfly valve in the following order:

– the adjusting screw is installed at the plant and does not demand adjustment. If the screw turned away, it is necessary to execute the following adjustment:

Fig. 5.61. System of injection of K-Jetronic fuel. Main installation of a butterfly valve: 1 – nut

– weaken a nut of 1 (fig. 5.61) , unscrew the adjusting screw so that the gap between the screw and the limiter then turn the screw clockwise, to a limiter contact was formed;

– the moment of contact can be defined, using the sheet of the thin paper inserted between them. From this moment turn the screw further half way;

– apply the liquid interfering an otvorachivaniye on a carving of a nut and tighten a nut;

– after adjustment, check idling turns.

Elements of system of injection of KE-Motronic fuel

Lambda sensor carry out check in the following order:

– connect the universal measuring device to the regulator 23 (see fig. 5.30 ) pressure difference;

– warm up the engine up to the working temperature, and let's it work in the idling mode within two minutes;

Fig. 5.64. System of injection of KE-Motronic fuel. Arrangement of the electric socket lambda sensor: 1 – hose of a sapun; 2 – connector lambda sensor

– note current in a chain of management, then press a hose of 1 (fig. 5.64) . Current in a chain of management has to decrease. Otherwise, disconnect wires a lambda sensor 2 and close a control unit wire on weight for twenty seconds. If current in a chain of management changes, so is faulty a lambda sensor.

The engine carry out check of system of braking in the following order:

– connect the universal measuring device to the regulator 23 (see fig. 5.30 ) pressure difference;

– include ignition, at the same time current in a chain has to be positive and make 90–110 ma. Otherwise change polarity of connection of connecting wires;

– start the engine and increase turns up to 3000 min.-1;

– quickly close a butterfly valve, at the same time current in a chain of management has to change quickly on negative.

Carry out valve check of cold start in the following order:

– disconnect wires of power supply of the coil 7 (see fig. 5.30 ) ignitions;

– disconnect the electric socket from temperature sensor;

– connect consistently to the socket the resistor with a resistance of 15 kOhm;

– remove the valve of cold start 13 and insert it into a glass jar;

– include a starter, of the valve has to go out an equal stream in the form of a cone;

– wipe the valve and dry it within a minute.

Carry out check of the switch of a butterfly valve in the following order:

– disconnect the electric plug 2 (see fig. 5.62 ), connect a tester to the switch of a butterfly valve. Check that resistance between two contacts was equal 0 Ohms at the closed butterfly valve, and infinity – at an open butterfly valve;

– check the moment of switching of the switch of turns of idling, slowly opening and then closing a butterfly valve. Operation has to happen at a gap between the lever of a butterfly valve and a control lever, equal 0,15–0,5 mm. If the gap differs from demanded, insert the probe 0,10 mm thick between levers, weaken switch 1 screws (see fig. 5.59 ), then move the switch so that the moment of operation was a little above. Tighten screws, and check adjustment.

Check of the main installation of a butterfly valve is carried out as it should be, analogicheny to the K-Jetronic system.

Carry out check of the coal filter in the following order:

– check a state and reliability of fastening of hoses and electric sockets;

Fig. 5.65. Coal filter: 1 – electromagnetic valve I (gray); 2 – rubber support; 3 – electromagnetic valve II (black); 4 – electric socket (black); 5 – case of a butterfly valve; 6 – arm; 7 – electric socket (gray); 8 – to the fuel tank; 9 – bolt; 10 – coal filter

– check that at the included ignition the valve of frequency 3 (the traction relay II) was open (fig. 5.65). Also check that at the switched-off ignition the gate-type valve 1 (the traction relay I) was open;

– at a temperature of cooling liquid below 60 °C remove a hose the leader to the filter from the valve of frequency 1 (the traction relay 1), then start the engine in the idling mode;

– on connection of the valve there should not be an absorption (or very insignificant) and the valve should not work. During the operation of the valve the pulsation will be noticeable;

– start the engine and warm up so that temperature of cooling liquid exceeded 60 °C, and repeatedly check operation of the valve. The valve has to pulse about 2 min., and in the place of its connection strong discharge then the valve has to cease to pulse on 90 with, without podsasyvaniye on connection has to be felt;

– otherwise check electric conducting to traction relays. If electric conducting is correct probably the KE-Motronic control unit is faulty.

Removal and installation of elements  of system of injection of Digifant fuel

PREVENTION All works on removal and installation of elements of system of injection need to be carried out at the removed wire from a negative conclusion of the rechargeable battery.

Carry out removal and installation of the measuring instrument of a consumption of air in the following order:

Fig. 5.66. Elements of system of injection of Digifant fuel: 1 – the filtering element; 2 – cover of the air filter; 3 – temperature regulator; 4, 14, 24, 26, 28, 32, 33, 36 – a bolt; 5 – laying; 6 – air stream measuring instrument; 7 – electric socket; 8 – the screw of adjustment of contents WITH; 9 – cap; 10 – sealing ring; 11 – collar; 12 – branch pipe; 13 – screw of adjustment of turns of idling; 15 – hose; 16 – connector; 17 – case of a butterfly valve; 18 – laying; 19 – hose; 20 – idling switch; 21 – switch of an open butterfly valve; 22 – a potentiometer of provision of a butterfly valve, 23 – an arm; 25 – inlet collector; 27 – a hose to the vacuum amplifier of brakes; 29 – a plate of fastening inlet to a final collector; 30 – cap; 31 – pipe WITH; 34 – arm; 35 – holder; 37 – laying; 38 – valve of stabilization of turns of idling; 39, 41, 42, 43 – a hose; 40 – tee; 44 – ring; 45 – rubber laying; 46 – case of the air filter; 47 – zabornik of air

– weaken a collar of 11 (fig. 5.66) and disconnect a branch pipe of the 12th air inlet from the air 6 stream measuring instrument;

– disconnect the plug from the electric socket 7 from the air stream measuring instrument;

– weaken brackets of fastening and raise a cover 2 air filters;

– disconnect hoses 43 regulators of pressure and uncover the air filter;

– turn off four bolts 4 fastenings, remove the air consumption measuring instrument from a cover of the air filter and consolidation 5.

Installation is carried out to the sequences, the return to removal.

Carry out removal and installation of the case of a butterfly valve in the following order:

– weaken a collar and disconnect a branch pipe of the 12th air inlet from the case 17 of a butterfly valve;

– disconnect a hose of ventilation of a case, a hose of the regulator of pressure and, in the presence, hoses to the coal filter on connections of the case of a butterfly valve;

– disconnect switches of a butterfly valve 21;

– disconnect an accelerator cable from a butterfly valve;

– turn off bolts of the 14th fastening;

– remove the block of a butterfly valve 17 from an inlet collector and laying 18 with the valve.

Installation is carried out to the sequences, the return to removal.

Removal and installation of elements of system of injection of Mono-Jetronic fuel

    

PREVENTION All works on removal and installation of elements of system of injection need to be carried out at the removed wire from a negative conclusion of the rechargeable battery.

Carry out removal and installation of the regulator of temperature of the air coming to the engine in the following order:

Fig. 5.67. Elements of system of injection of Mono-Jetronic fuel: 1 – additional resistor; 2 – vacuum шлан; 3 – bolt; 4 – the regulator of temperature of the air coming to the engine; 5 – valve cover; 6 – sealing ring; 7 – injector; 8 – electric socket; 9 – the control unit, 10 – a fastening plate; 11 – ventilating tube; 12 – valve of management; 13 – a vacuum hose, 14 – a fuel return tube (blue); 15 – tube of supply of fuel (black); 16 – injector air inlet cover; 17 – air inlet union; 18 – plug; 19 – electric socket of the additional resistor

– weaken a collar, disconnect an air inlet branch pipe from a cover of an air inlet of an injector of 7 (fig. 5.67) ;

– disconnect vacuum hoses 3, 13 from an injector air inlet cover;

– turn off three bolts 3 covers of an air inlet of the 16th injector and disconnect it from an injector 7;

– unscrew screws and disconnect the regulator 4 temperatures of the air coming to the engine from an injector air inlet cover.

You carry out installation to the sequences, the return to removal.

Removal and installation of an injector is carried out in the following order:

– weaken a collar, disconnect an air inlet branch pipe from the union 17 of a cover of the 16th air inlet of an injector;

– disconnect electric sockets from an injector;

– turn off nuts, disconnect giving (black) 15 and returnable (blue) the 14th fuel tubes from an injector;

– unscrew two screws of fastening, remove the valve of management 12 of the provision of a butterfly valve from an injector. And the electric plug 18 it is possible to leave vacuum tubes 13 on the valve;

Fig. 5.68. Injector of system of injection of Mono-Jetronic fuel: 1 – screw; 2 – holder of a nozzle; 3 – cover; 4 – sealing ring; 5 – nozzle; 6 – rack-bopt; 7 – the top case of an injector, 8 – laying; 9 – screw; 10 – clamp; 11 – cover; 12 – spring; 13 – diaphragm; 14 – pressure regulator; 15 – screw; 16 – transitional plug; 17 – sealing ring; 18 – electric socket

– unscrew bolts 3 fastenings and remove an injector (fig. 5.68) .

You carry out installation to the sequences, the return to removal.

Carry out removal and installation of the additional resistor in the following order:

– disconnect the electric socket 19 (see fig. 5.67 );

– unscrew nuts and remove the resistor 1 together with an arm.

You carry out installation to the sequences, the return to removal.

Carry out removal and installation of an element of heating of an inlet collector in the following order:

– the element of heating of an inlet collector is installed on a reverse side of an inlet collector, and for access to it it is better to remove a collector;

– disconnect the electric socket, unscrew screws of fastening and remove a heating element from a collector and laying.

You carry out installation to the sequences, the return to removal.

Lambda sensor carry out removal and installation in the following order:

– disconnect the electric socket 10 (see fig. 5.24 ) the sensor, then turn off and disconnect a lambda sensor from a final collector;

– grease a carving a lambda sensor with high-temperature VW G5 lubricant, but at the same time you watch that lubricant did not get to grooves or an opening of the case of the sensor.

You carry out installation to the sequences, the return to removal;

Carry out removal and installation of a thermoswitch and temperature sensors in the following order:

– the thermoswitch and temperature sensors are placed in a connecting branch pipe of the cooling system on the forward party of a head of the block of cylinders.

Removal and installation of elements  of system of injection of K-Jetronic fuel

PREVENTION All works on removal and installation of elements of system of injection need to be carried out at the removed wire from a negative conclusion of the rechargeable battery.

Carry out removal and installation of the distributor of fuel in the following order:

– works have to be carried out in well aired room;

– disconnect a wire from the negative plug of the rechargeable battery;

Fig. 5.69. Elements of system of injection of K-Jefronic fuel: 1 – bolt; 2 – screw; 3 – fuel distributor; 4 – sealing ring; 5 – fuel hoses; 6, 27 – a hollow bolt; 7 – cap; 8 – sealing ring; 9 – pressure regulator; 10 – electric socket (blue); 11 – switch of starting supply of fuel; 12 – electric socket (brown); 13 – temperature sensor; 14 – electric socket (gray); 15 – heater; 16 – vacuum union; 17 – valve of cold start-up; 18 – laying; 19 – plug; 20 – sealing ring; 21 – nozzle; 22 – nut of the fuel highway; 23 – air consumption measuring instrument; 24 – plunger; 25 – the screw of adjustment of contents WITH; 26 – spring; 28 – adjusting washer

– pit pressure in fuel system for what weaken a collar of an inlet fuel hose of 5 (fig. 5.69) in a motor compartment;

– uncover, note an arrangement of fuel-supply lines on the distributor 3 and clear them of dirt;

– disconnect fuel-supply lines;

– unscrew screws 2 fastenings and remove the distributor 3 fuels from the top part of the measuring instrument 23 streams of air.

You carry out installation to the sequences, the return to removal.

Carry out removal and installation of the measuring instrument of a consumption of air in the following order:

– the measuring instrument of a stream of air can be removed together with the fuel distributor.

– pit pressure in fuel system for what weaken fuel connection of an inlet fuel hose in a motor compartment;

– uncover, note an arrangement of fuel-supply lines on the distributor 3 and clear them of dirt;

– disconnect fuel-supply lines;

– unscrew screws 2 fastenings and remove the fuel distributor from the top part of the measuring instrument 15 of a stream of air;

– disconnect the electric socket from the diaphragm pressure sensor;

– disconnect a vacuum hose, unscrew screws of fastening and remove the switch;

– disconnect the air duct from the air consumption measuring instrument 15;

– unscrew fastening screws, disconnect the air consumption measuring instrument from the air filter.

You carry out installation to the sequences, the return to removal.

The engine carry out removal and installation of the valve of braking in the following order:

– press a bracket of fixing and disconnect the electric socket from the valve 12 (see fig. 5.69 .);

– disconnect a vacuum hose from the valve on a tee of the line of the sensor of pressure of a diaphragm;

– disconnect the air filter and hoses of connection of an air inlet with the gate-type valve;

Fig. 5.71. Vacuum highways on system of injection of K-Jetronic fuel: 1 – control unit; 2 – temperature regulator; 3 – braking valve engine; 4 – pressure sensor; 5 – adjustment of the gate; 6 – to the conditioner; 7 – to the indicator; 8 – to the vacuum amplifier of brakes; 9 – to the ABS indicator; 10 – ABS limiter

– remove the valve 3 (see fig. 5.71 ) braking by the engine.

You carry out installation to the sequences, the return to removal.

Carry out removal and installation of the valve of cold start in the following order:

– pit pressure in fuel system for what weaken a collar fuel connection of an inlet hose in a motor compartment;

Fig. 5.70. Air supply elements in the engine on system of injection of K-Jetronic fuel: 1 – air consumption measuring instrument; 2 – the screw of adjustment of contents WITH; 3 – cap; 4 – air supply branch pipe; 5 – vacuum connecting coupling; 6 – bolt; 7 – diaphragm pressure sensor; 8 – connecting coupling; 9 – temperature regulator; 10 – switch of a butterfly valve; 11 – screw of adjustment of turns of idling; 12 – uplotnitepny ring; 13 – a bolt, 14 – laying; 15 – case of a butterfly valve; 16 – top inlet collector; 17 – a hose to the heater; 18 – valve of stabilization of turns of idling; 19 – valve of cold start-up; 20 – bolts; 21 – union; 22 – hose of ventilation of a case; 23 – lower inlet collector; 24 – union; 25 – braking valve engine; 26 – a hose of supply of the warmed-up air; 27 – adjustment of the folding gate; 28 – case of the air filter; 29 – air filter; 30 – cover of the air filter

– turn off a hollow bolt of 20 (fig. 5.70) and disconnect a fuel-supply line from the valve 19 of cold start;

– remove washers from two parties of the coupling of a fuel-supply line;

– turn off bolts and remove a collector 23;

– disconnect a hose from the valve.

You carry out installation to the sequences, the return to removal.

Removal and installation of elements of system of injection of KE-Motronic fuel

PREVENTION All works on removal and installation of elements of system of injection need to be carried out at the removed wire from a negative conclusion of the rechargeable battery.

Fig. 5.73. Types lambda sensors: 1 – the sensor without heating with flutes is installed in the Mono-Jetronic system with the catalyst; 2 – the sensor with heating with openings is installed in the Mono-Jetronic system without catalyst; 3 – the sensor with several grooves is installed on all systems except Mono-Jetronic

The oxygen sensors used in systems of injection of fuel are shown in fig. 5.73 .

Carry out removal and installation of the regulator of pressure in the following order:

Fig. 5.72. Elements of system of injection of KE-Motronic fuel: 1 – electric sockets lambda sensor; 2 – electric socket; 3 – electric socket; 4 – control unit; 5 – lambda sensor; 6 – plug; 7 – sealing ring; 8 – nozzle; 9 – connecting coupling; 10 – electric socket; 11 – bolt; 12 – pressure regulator; 13 – sealing ring; 14 – coal filter; 15 – temperature sensor; 16, 24 – bolts; 17 – valve of cold start-up; 18 – inlet collector; 19 – returnable pipeline; 20 – connecting coupling; 21 – plunger; 22 – air stream measuring instrument; 23 – diaphragm regulator of pressure; 25 – lock screw of a plunger; 26 – sealing ring; 27 – hollow bolt; 28 – the feeding pipeline; 29 – cap; 30 – the distributor of fuel, A, B, C, D and E — hoses

– the regulator of pressure of 12 (fig. 5.72) is installed sideways the fuel 9 distributor;

– unscrew screws 11 of fastening and remove pressure regulator.

You carry out installation to the sequences, the return to removal.

Carry out removal and installation of the diaphragm regulator of pressure in the following order:

– pit pressure in fuel system for what weaken fuel connection of an inlet hose in a motor compartment;

– turn off nuts and disconnect fuel-supply lines from the diaphragm regulator 23 pressure;

– weaken fastening of the holder and remove the diaphragm regulator of pressure.

You carry out installation to the sequences of the return to removal.

Carry out removal and installation of the coal filter in the following order:

– weaken collars and disconnect hoses from the coal filter 14;

– turn off bolts and remove the coal filter.

You carry out installation to the sequences, the return to removal;

Carry out removal and installation of the distributor of fuel in the following order:

– pit pressure in fuel system for what weaken fuel connection of an inlet hose in a motor compartment;

– uncover the fuel 30 distributor, note an arrangement of fuel-supply lines and clear them of dirt;

– disconnect fuel-supply lines;

– turn off bolts of the 25th fastening and remove the fuel distributor from the top part of the measuring instrument of a consumption of air;

– put a tag to designate position of the screw (see fig. 5.41 );

– measure the size of a vystupaniye of the lock screw from a nut (see fig. 5.42 ) and unscrew the lock screw;

– wash out a plunger in gasoline or alcohol;

– check a condition of a sealing ring of the lock screw and if necessary replace it, at the same time establish a sealing ring by smaller diameter to a plunger.

You carry out installation to the sequences, the return to removal.