15.6. System of decrease in toxicity of the fulfilled gases

On engines with a turbo-supercharging and injection of fuel systems of decrease in toxicity of the fulfilled gases which by the principle of action and appointment are similar described in section 8 "System of decrease in toxicity of the fulfilled gases" are installed, however because of certain constructive differences of the procedure of check and service of this system a bit differents also demand separate consideration.
At elimination of malfunctions in system of decrease in toxicity of the fulfilled gases it is also necessary to check power supply systems fuel and production of the fulfilled gases, electric equipment elements as they are interconnected.

System of injection of air of models 1986 and 1987 of years of release
The system of injection of air consists of control and reed valves which are installed on the case of the air filter. Engines with a turbo-supercharging, besides the valve on the case of the air filter, have additional remote reed valves installed on the right cup of the shock-absorber.

Fig. 15.50. Scheme of system of injection of air: and – engines without turbo-supercharging; b – engines with a turbo-supercharging; 1, 4 – control valves; 2, 3, 5 – reed valves


When depression in an inlet collector reaches a certain level, the control valve opens and in a collector fresh air due to sharp increase in speed of a stream of the fulfilled gases is soaked up (fig. 15.50). At the same time reburning of the remains of not burned down fuel is provided and the content of hydrocarbons in the fulfilled gases decreases. Two remote valves in cars work with a turbo-supercharging only when forming rather strong stream of the fulfilled gases providing suction of air via these valves (as a rule, with a frequency of rotation of a bent shaft of the mines-1 engine 2500).
Check of valves
For check of system of injection of air uncover the air filter and transfer the engine to the idling mode. To the air canal the notable stream of air has to be soaked up that is checked by means of the sheet of paper brought to an opening.
Finish the frequency of rotation of a bent shaft of the engine up to 2500 min.-1 and be convinced that there is no absorption of air. Visually check that the fulfilled gases do not come out through an opening.
If the system does not work normally, check the control air valve and the reed valve.
For check of the control air valve take out it from the case and connect to the vacuum pump. Gradually pump out air and watch a rod which has to move forward at depression of 180-280 mm of mercury. If the valve does not pass test or is untight, replace it.
For check of the reed valve warm up the engine and set the idling mode. Connect the vacuum pump and pump out air up to the pressure of 500 mm of mercury. Lift a cover of the air filter and check whether air in an opening is soaked up. Finish the frequency of rotation of a bent shaft of the engine up to 2500 min.-1 and be convinced of lack of an exit of the fulfilled gases. If the valve does not pass test, replace it.
For check of remote reed valves (only for engines with a turbo-supercharging) finish the frequency of rotation of a bent shaft of the engine up to 2500 min.-1 and check absorption of air to canals. Be convinced of lack of an exit of the fulfilled gases. If both valves do not pass test, replace them.
Replacement of valves

Fig. 15.51. Elements of fastening of the control valve


For replacement of the control valve unscrew two screws and take the valve from the case of the air filter (fig. 15.51). Installation is carried out to the sequences, the return to removal.

Fig. 15.52. Elements of fastening of the reed valve: 1 – laying; 2 – assembly plate; 3 – rubber insert; 4 – reed valve; 5 – case


For replacement of the reed valve uncover the air filter. Take from the filter case an assembly plate, a rubber insert, laying and the reed valve (fig. 15.52). Check a condition of an insert, in the presence of cracks and other signs of destruction replace an insert. Installation is carried out to the sequences, the return to removal. Surely replace laying.

Fig. 15.53. Elements of fastening of remote reed valves: 1 – back cover; 2, 4 – laying; 3 – distributive plate;
5 – the directing tube; 6 – case; 7 – air filter; 8 – rubber insert; 9 – reed valve; 10 – forward cover


For replacement of remote reed valves (only for engines with a turbo-supercharging) remove the case of valves from the right cup of the shock-absorber and put on a pure surface. Turn out four screws on corners of a cover and remove details of valves (fig. 15.53). In the course of assembly replace laying and if necessary rubber inserts.

System of catching of vapors of fuel (EEC)

Fig. 15.54. Scheme of system of catching of vapors of fuel (EEC): 1 – butterfly valve; 2 – from the water temperature valve; 3 – control valve of a purge No. 1; 4 – from the fuel tank; 5 – control valve of a purge No. 2; 6 – stopper of a bulk mouth; 7 – three-running control valve;
8 – fuel tank; 9 – tank; 10 – throttle; 11 – control valve of a purge No. 3; 12 – three-running electromagnetic distributor; 13 – to the control unit; 14 – except the EU-AT


The system of catching of vapors of fuel provides absorption of vapors of gasoline with an adsorber (a tank with absorbent carbon) at the idle engine. At launch of the engine of couple of fuel are soaked up in a receiver and are burned in the course of operation of the engine (fig. 15.54).
Check of system of catching of vapors of fuel
For check of a condition of system of catching of vapors of fuel warm up the engine and set the idling mode. Disconnect a hose from the control valve of a purge No. 1 and connect the vacuum gage to the disconnected hose. Finish the frequency of rotation of a bent shaft of the engine up to 2500 min.-1 and watch indications of the vacuum gage. Depression has to be not less than 150 mm of mercury. If the indication differs, check the water temperature valve. Attach a hose to the purge No. 1 valve.

Fig. 15.55. A detachment of a vacuum hose (1) from the control valve of a purge No. 3


Disconnect a vacuum hose from the control valve of a purge No. 3 installed over the ignition distributor and close it a suitable stopper (fig. 15.55). Connect the vacuum gage to the valve, launch the engine and finish the frequency of rotation of a bent shaft up to 1500 min.-1; the vacuum gage has to show depression. If there is no depression, check the three-running electromagnetic valve and the control valve of a purge No. 3.
Disconnect a vacuum hose from a tank. Connect the vacuum pump to an evaporator hose and try to create depression. If the three-running valve or a tube of the evaporator are not littered, it is impossible to create depression. Emergence of depression indicates a contamination in a vaporizing tube or in the three-running control valve.

Fig. 15.56. Use of the vacuum gage and a purge of the channel (1) when checking the control valve of a purge No. 1


For check of the control valve No. 1 blow channel "A" (fig. 15.56). Air should not pass through the valve. Attach the vacuum pump to the purge No. 1 valve and create depression of 130 mm of mercury. Now air has to pass through the valve freely. If air does not pass, replace an adsorber tank.
For check of the control valve of a purge No. 2 disconnect a hose from a vaporizing tube and blow a hose. Air has to pass freely through the valve, otherwise replace an adsorber tank.

Fig. 15.57. Use of the vacuum gage and a purge of the channel (1) when checking the control valve of a purge No. 3


For check of the control valve of a purge No. 3 remove it from the car and connect the vacuum pump, as shown in fig. 15.57. Blow channel 1 and be convinced that at depression less than 60 mm of mercury. air does not pass through the valve. Create depression of 75 mm of mercury in the camera of the valve. In this case air has to pass through the valve freely. If results of two tests negative, replace the valve.

Fig. 15.58. Check of the water temperature valve a purge its air at a temperature of 50 °C


For check of the water temperature valve turn out it from an inlet collector and attach hoses to each of unions. Ship the valve in water at a temperature of 50 °C and blow a hose (fig. 15.58). Air has to pass through the valve freely. Otherwise replace the valve.

Fig. 15.59. Check of the three-running control valve: And, In, With - the union


For check of the three-running control valve remove it from the car. According to fig. 15.59 give air to the union A and be convinced that air goes out of the union B. Then close the union B and be convinced that air goes out of the union C. Muffle the union B and connect the vacuum pump to the union A. Create depression and be convinced that air is soaked up in the union C. At negative result of any of these tests replace the three-running control valve.

Fig. 15.60. Check of the three-running electromagnetic distributor: And, In – the union


For check of the three-running electromagnetic distributor remove it from the car. Attach hoses to each of valve unions according to fig. 15.60. Give air to the union A and be convinced that air goes out of the air filter. Then give on contacts of the valve tension from the rechargeable battery – air has to go out of the union B. At negative results of tests replace the valve.
Replacement of elements
Two valves of a purge are built in in an adsorber tank therefore their replacement is separately impossible. For replacement of the valve of a purge No. 3 disconnect hoses on one and attach them to the new valve.
For removal of the water temperature valve cool the engine, then merge cooling liquid up to one level lower than the valve. Disconnect two vacuum hoses and turn out the valve from an inlet collector. Before installation wrap up a carving part of the valve a teflon tape. Check an integrity of end faces of hoses. Existence of cracks or hardening can be a tightness cause of infringement. Wrap the valve by hand, then reliably tighten a key. Put on hoses on the union of the valve and restore the level of cooling liquid.

Fig. 15.11. Power supply system elements fuel: 1 – the fuel filter (on the highway of high pressure); 2 – fuel distributive highway; 3 – nozzle; 4 – tank; 5 – the operating pressure regulator valve; 6 – the filter of the fuel tank (on the soaking-up party); 7 – fuel pump; 8 – three-running distributive valve


The three-running control valve is installed near the fuel tank (see fig. 15.11). For the correct assembly attach an adhesive tape of a tag, then weaken collars and disconnect hoses from the valve. Turn out screws and remove the valve. In the presence of cracks and hardening of hoses replace them. Installation is carried out to the sequences, the return to removal. Put on hoses on corresponding the union and fix by collars.

Fig. 15.14. An arrangement of elements of an electronic control system of the engine without turbo-supercharging: 1 – three-running electromagnetic distributor; 2 – the operating pressure regulator valve; 3 – sensor of atmospheric pressure; 4 – three-running electromagnetic distributor; 5 – control unit; 6 – relay of the fuel pump; 7 – the sensor of temperature of the soaked-up air; 8 – control air valve; 9 – main relay; 10 – air consumption measuring instrument; 11 – temperature switch; 12 – analog sensor of temperature of cooling liquid; 13 – sensor of concentration of oxygen; 14 – air valve; 15 – thermostat; 16 – the control valve of recirculation of the fulfilled gases; 17 – pneumatic shock-absorber; 18 – the recirculation valve with the smooth characteristic;
19 – sensor of an angle of opening of a butterfly valve; 20 – perepuskny electromagnetic valve


Fig. 15.15. An arrangement of elements of an electronic control system of the engine with a turbo-supercharging: 1 – саморазблокирующееся relay of the fuel pump; 2 – the operating pressure regulator valve; 3 – three-running electromagnetic distributor; 4 – control unit; 5 – the sensor of temperature of the soaked-up air; 6 – control air valve; 7 – main relay; 8 – air consumption measuring instrument; 9 – analog sensor of temperature of cooling liquid; 10 – temperature switch; 11 – sensor of concentration of oxygen; 12 – air valve; 13 – the control valve of recirculation of the fulfilled gases; 14 – the position sensor of recirculation of the fulfilled gases; 15 – case of the reed valve; 16 – pneumatic shock-absorber; 17 – throttle knot; 18 – electromagnetic valve of recirculation; 19 – perepuskny electromagnetic valve; 20 – pressure relay; 21 – sensor of atmospheric pressure


The three-running electromagnetic distributor is installed on a wall of a motor compartment, at the majority of cars it is at the most left edge of the panel (see fig. 15.14, 15.15). For removal of the valve attach an adhesive tape of a tag on hoses that at assembly to establish them on the former place, then remove hoses. Disconnect the socket, the small screw-driver take a lock ring and extend the valve from the panel. Installation is carried out to the sequences, the return to removal.

System of ventilation of a case (PCV)
The system of compulsory ventilation of a case of engines with system of injection of fuel is similar to the system described in section 8 "System of decrease in toxicity of the fulfilled gases". Check of the spool-type device differs from described.
Warm up the engine up to the normal working temperature and leave to idle. Take the spool-type device from a cover of a head of the block of cylinders and apply to it a finger. If the frequency of rotation of a bent shaft of the engine idling decreases, so the spool-type device regularly.

System of recirculation of the fulfilled gases
The system of recirculation of the fulfilled gases is intended for decrease in content in the fulfilled gases of nitrogen oxides at the expense of the direction of a part of gases in an inlet collector. Work of system depends on extent of depression, pressure of the fulfilled gases, temperature of cooling liquid, and on engines with a turbo-supercharging and on engine loading, and also speed of the movement.
Check of system of recirculation of the fulfilled gases
The arrangement of elements of system is shown in fig. 15.14, 15.15.
Check a condition of vacuum hoses. Are not carried too far, weakening of density of their landing, twisting and anguishes. On cars of 1988-1991 of release check that the diaphragm under the valve of recirculation moved easily, without jammings; for this purpose implant a hand under the valve and press a diaphragm. Launch the engine and be convinced that at increase in frequency of rotation of a bent shaft of the engine the diaphragm moves up.
On cars 1986 and 1987 of of release disconnect a vacuum hose from the recirculation valve and close it a stopper, kind of work of the engine should not change. Otherwise check the valve.
Connect the vacuum gage to the disconnected hose (for engines with a turbo-supercharging). Idling depression should not be, the vacuum gage has to show depression with a frequency of rotation of a bent shaft of the mines-1 engine 2500. Otherwise check the electromagnetic valve of recirculation. Attach a hose.
On cars 1986 and 1987 of of release with engines without turbo-supercharging disconnect a hose from the smoothing valve of recirculation and close it a stopper. Attach a hose piece to the released union of the smoothing valve, finish the frequency of rotation of a bent shaft of the engine up to 2500 min.-1, blow in a hose and watch indications of the vacuum gage which have to increase. If depression does not increase, check the smoothing valve. Attach hoses.
On the cars equipped with engines with a turbo-supercharging between the electromagnetic valve of recirculation and the control valve of recirculation turn on the vacuum gage. Increase the frequency of rotation of a bent shaft of the engine and consider the indication of the vacuum gage. Then disconnect a hose from the valve of recirculation and close it a stopper, the indication has to be less previous. Otherwise check the position sensor of recirculation and the electromagnetic valve of recirculation.
At the muffled vacuum hose disconnect the socket from the temperature switch on a broad tank of a radiator. Finish the frequency of rotation of a bent shaft of the engine up to 2500 min.-1 – the vacuum gage should not register depression. Otherwise check the electromagnetic valve of recirculation.

Fig. 15.61. A detachment of a hose (1) and connection of the vacuum gage instead of it for check of the smoothing recirculation valve


On cars 1986 and 1987 of of release with engines without turbo-supercharging disconnect a hose from the smoothing valve of recirculation and instead of it connect the vacuum gage (fig. 15.61). Finish the frequency of rotation of a bent shaft of the engine up to 2500 min.-1, at the same time indications of the vacuum gage have to be not less than 150 mm of mercury. If the indication differs, check the three-running electromagnetic distributor. Disconnect the socket from the temperature switch on a broad tank – the vacuum gage should not register depression. Otherwise check the three-running electromagnetic distributor.
For check of the control valve of recirculation in engines with a turbo-supercharging and without it warm up the engine up to the normal working temperature, then disconnect a hose from the smoothing valve and close it a stopper; kind of work of the engine should not change. Otherwise remove the valve and clean the channel of production of the fulfilled gases and draft of the valve.

Fig. 15.62. Check of the smoothing valve of recirculation of the fulfilled gases: and – the direction of a purge


Connect the vacuum pump to the control valve of recirculation and create depression not less than 75 mm of mercury. The engine has to begin to work with interruptions or to decay. If it does not occur, replace the valve. For check of the smoothing recirculation valve (only in engines without turbo-supercharging) it needs to be removed from the engine. Attach the vacuum pump to the union No. 3, close a stopper the union No. 1 and at the working pump blow in the union for the fulfilled gases – depression should not change (fig. 15.62). After removal of pressure in the union for the fulfilled gases depression should not remain. If depression remains, replace the smoothing valve.
For check of the position sensor of recirculation (only in engines with a turbo-supercharging) remove a rubber cover from the sensor socket, without separating the socket.

Fig. 15.63. Measurement of tension on contacts of the socket of the position sensor


Disconnect a vacuum hose from the control valve of recirculation and connect the vacuum pump. Turn a key in the ignition switch in the provision of "ON" and measure tension on each contact of the socket (fig. 15.63). Conditions of measurements are given in tab. 15.15.

Table 15.15
Change of tension on contacts of the socket of the position sensor depending on depression
If tension on contacts "And" and "In" differs from the values given in tab. 15.15 check wires and hand over on check in the service center the control unit. If tension on contact differs "With", check sensor resistance, then check wires and hand over the control unit on check in the service center.

Fig. 15.64. Measurement of resistance between contacts of the socket of the position sensor


Disconnect the socket and measure resistance between contacts of the position sensor (fig. 15.64). If any resistance differs from provided in tab. 15.16, replace the control valve of recirculation in collecting (the position sensor separately is not delivered).

Table 15.16
Resistance between contacts of the socket of the position sensor

The electromagnetic valve of recirculation (only in engines with a turbo-supercharging) consists of two valves – ventilating and vacuum. For check of the ventilating valve disconnect hoses and blow the ventilating channel – air has to pass freely.

Fig. 15.65. An arrangement of contacts of the socket on which it is necessary to give tension from the rechargeable battery when checking the electromagnetic valve of ventilation: 1 – "weight"; 2 – positive tension from the rechargeable battery


Disconnect the socket and give tension from the rechargeable battery on contacts of the socket according to fig. 15.65. Again blow the ventilating channel – air should not pass, otherwise replace the valve.
For check of the vacuum valve disconnect hoses and blow the vacuum channel – air should not pass.

Fig. 15.66. An arrangement of contacts of the socket on which it is necessary to give tension from the rechargeable battery when checking the electromagnetic valve of recirculation: 1 – vacuum hose; 2 – "weight"; 3 – positive tension from the rechargeable battery


Disconnect the socket and give tension from the rechargeable battery on contacts of the socket according to fig. 15.66. Again blow the vacuum channel – air has to pass freely, otherwise replace the valve.
Replacement of elements of system of recirculation of the fulfilled gases
Remove the control valve of recirculation only after full cooling of the engine. Mark and disconnect vacuum hoses, turn off three bolts and remove the valve. Remove the laying remains from the contact surfaces of the valve. Installation is carried out to the sequences, the return to removal.
For removal of the smoothing valve of recirculation mark an adhesive tape all hoses to provide correctness of their connection. Unclench a spring bracket and take the valve. Installation is carried out to the sequences, the return to removal.
If the position sensor of recirculation is faulty, it is necessary to replace it assembled as the sensor separately is not on sale.
For replacement of the electromagnetic valve of recirculation mark an adhesive tape all hoses to provide correctness of their connection, and disconnect them. Turn off nuts and remove the electromagnetic valve from a wall of a motor compartment. Installation is carried out to the sequences, the return to removal.