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Emission of exhaust gases
On engines with turbocharging and fuel injection systems are installed emission control which according to the principle of action and purpose similar to those described in Sec. 8 "The system of emission control," but because of certain structural differences in the test procedures and maintenance of this system are somewhat different and require separate consideration. When troubleshooting system, emission control should also check the fuel supply system and exhaust system, electrical installations, as they are interrelated.
The system of air injection models 1986 and 1987 model years Air injection system consists of a control and reed valves, which are mounted on the air filter housing. In turbocharged engines, in addition to the valve on the air filter housing, provides additional remote reed valves mounted on the right shock absorber cup.
| Fig. 15.50. Driving air injection system: a - non-turbo engines; b - turbocharged engines; 1, 4 - check valves; 2, 3, 5 - reed valves
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When the vacuum in the intake manifold reaches a predetermined level, opens the check valve and is sucked into a collector fresh air due to a sharp increase the exhaust gas flow rate (Fig. 15.50). This provides afterburning of unburned fuel residues and reduced hydrocarbon content in the exhaust gases. Two remote valves in cars with turbocharged only work in the formation of a sufficiently strong flow of exhaust gases, providing suction of air through the valve (usually at a frequency of engine speed 2500 min -1). Check valves To check the air injection system, remove the air filter cover and turn the engine to idle. The air duct must be absorbed significant flow of air, which is verified by a sheet of paper, held close to the hole. Bring the engine speed of the engine to 2500 min -1, and make sure there is no air intake. Visually check that the exhaust gases do not come out through the hole. If the system does not work properly, check the air control valve and the reed valve. To test the control air valve, remove it from the case and connect to a vacuum pump. Gradually evacuated and watch the rod, which should advance in low-pressure 180-280 mm Hg. Art. If the valve does not withstand the test or is leaking, replace it. To test the reed valve warm up the engine and set the idling speed. Connect the vacuum pump and evacuated to a pressure of 500 mm Hg. Art. Lift the air filter cover and check whether the air is sucked into the hole. Bring the engine speed of the engine to 2500 min-1 and check the exhaust gas outlet. If the valve does not withstand the test, replace it. To check the remote reed valve (only for turbocharged engines), bring the frequency of engine speed to 2500 min-1 and check suction of air in the channels. Check for exhaust gas output. If both valves fail, replace them. Replacement valves
| Fig. 15.51. Fasteners control valve
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To replace the control valve, unscrew the two screws and remove the valve from the air filter housing (Fig. 15.51). Installation is performed in reverse order of removal.
| Fig. 15.52. Fasteners reed valve 1 - a lining; 2 - mounting plate; 3 - rubber insert; 4 - reed valve; 5 - Housing
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To replace the reed valve, remove the air filter cover. Remove the filter housing mounting plate, rubber insert, the gasket and the reed valve (Fig. 15.52). Check the condition of the insert, in the presence of cracks and other signs of destruction, replace the insert. Installation is performed in reverse order of removal. Be sure to replace the gasket.
| Fig. 15.53. Fasteners remote reed valves: 1 - Back Cover; 2, 4 - gaskets; 3 - distribution plate; 5 - the guide tube; 6 - the case; 7 - the air filter; 8 - a rubber insert; 9 - reed valve; 10 - Front Cover
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To replace the remote reed valve (only for turbocharged engines), remove the valve body from the right shock absorber cup and place on a clean surface. Remove the four screws at the corners of the cover and remove the valve components (Fig. 15.53). During assembly, the gasket and replace if necessary rubber insert.
The system EVAP (EEC)
| Fig. 15.54. The scheme of system EVAP (EEC): 1 - throttle; 2 - from the water temperature of the valve; 3 - purge control valve ?��1; 4 - from the fuel tank; 5 - purge control valve ?��2; 6 - filler cap; 7 - three-way control valve; 8 - the fuel tank; 9 - a tank; 10 - throttle; 11 - check valve purge ?��3; 12 - a three-way solenoid valve; 13 - to the control unit; 14 - except for EU-AT
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EVAP system absorbs gasoline vapor adsorber (tank with activated carbon) with the engine off. When starting the engine fuel vapors absorbed in the receiver and burnt during engine operation (Fig. 15.54). Checking system EVAP To check the status of the fuel vapor recovery system warm up the engine and set the idling speed. Disconnect the hose from the control valve purge ?��1 and connect to the disconnected hose the vacuum gauge. Bring the engine speed of the engine to 2500 min -1, and observe the gauge readings. Depression should not be less than 150 mm Hg. Art. If the reading is different, check the water temperature valve. Attach a hose to the purge valve ?��1.
| Fig. 15.55. Detach vacuum hose (1) from the purge control valve ?��3
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Disconnect the vacuum hose from the control valve purge ?��3, installed on the ignition distributor, and close it with a suitable plug (Fig. 15.55). Connect the gauge to the valve, start up the engine and bring the engine speed up to 1500 min -1; the gauge should show a vacuum. If there is no vacuum, check the three-way solenoid valve and check valve purge ?��3. Disconnect the vacuum hose from the tank. Connect the hose of the evaporator and a vacuum pump to create a vacuum try. If the three-way valve or tube evaporator is not blocked, it is impossible to create a vacuum. The appearance of the vacuum indicates a blockage in the evaporator tube or in a three-way control valve.
| Fig. 15.56. Using a vacuum gauge and purge channel (1) for checking the purge control valve ?��1
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To check the control valve ?��1 blow channel "A" (Fig. 15.56). The air should not pass through the valve. Connect the purge valve ?��1 vacuum pump to apply a vacuum of 130 mm Hg. Art. Now, the air must pass freely through the valve. If the air does not pass, replace the reservoir canister. To check the purge control valve ?��2 disconnect the hose from the evaporator tube and blow tube. The air must pass freely through the valve, otherwise replace the reservoir canister.
| Fig. 15.57. Using a vacuum gauge and purge channel (1) for checking the purge control valve ?��3
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To check the purge control valve ?��3, remove it from the car and connect the vacuum pump, as shown in Fig. 15.57. Blow channel 1 and ensure that the vacuum of less than 60 mm Hg. Art. the air passes through the valve. Create a valve chamber vacuum of 75 mm Hg. Art. In this case the air must pass freely through the valve. If the results of two tests are negative, replace the valve.
| Fig. 15.58. Check the water temperature valve purge it with air at a temperature of 50 ?� C
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To check the temperature of the water valve, remove the it from the intake manifold and to each of the nozzles, connect the hoses. ???????????�???�?� ???�?�???�?? ?? ???????? ?????? ?�?�?????�???�?�?????� 50 ?�?? ?? ?????????????�?� ???�?�???? ( ??????. 15.58 ). ?�???�?????� ?????�?�?�?? ???????�???????? ???????�???????�?? ?�?�???�?� ???�?�???�??. Otherwise, replace the valve.
| Fig. 15.59. ?????????�?????� ?�???�?�?�?????????????? ???????�?????�?????????? ???�?�???�???�: ??, ?�, ?? - ???�???�?�???�
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?�?�?? ?????????�?????? ?�???�?�?�?????????????? ???????�?????�?????????? ???�?�???�???� ???????????�?� ?�???? ?? ?�???�???????�???�??. ?� ???????�???�?�???�?????? ?? ??????. 15.59 ???????�???�?� ?????�?????� ?? ???�???�?�?? ?? ?? ???�?�?????�?�????, ?�?�?? ?????�?????� ???�?�???????� ???� ???�???�?�???� ?�. ?�?�?�?�?? ?�?�?????????�?� ???�???�?�?? ?� ?? ???�?�?????�?�????, ?�?�?? ?????�?????� ???�?�???????� ???� ???�???�?�???� ??. ?�?�???�???????�?� ???�???�?�?? ?� ?? ?????????�???�???�?� ???�???????????�?? ???�?????? ?? ???�???�?�???? ??. ?????�???�???�?� ???�?�???�?�?�?????� ?? ???�?�?????�?�????, ?�?�?? ?????�?????� ?????�???�???�?�?�???? ?? ???�???�?�?? ??. ?????? ???�?????�?�?�?�?�???????? ???�?�???�???�?�?�?� ?�???�?????? ???� ???�???� ???????�?�?�?????? ?�?�???�?????�?� ?�???�?�?�???????????? ???????�?????�?????�?? ???�?�???�??.
| Fig. 15.60. ?????????�?????� ?�???�?�?�?????????????? ???�?�???�???????�???????�???????? ???�???????�???�?�???�?�?�??: ??, ?� ??� ???�???�?�???�
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?�?�?? ?????????�?????? ?�???�?�?�?????????????? ???�?�???�???????�???????�???????? ???�???????�???�?�???�?�?�?? ???????????�?� ?�???? ?? ?�???�???????�???�??. ???????????�?????????�?� ???�?�?????? ?? ???�?�???????? ???� ???�???�?�?????? ???�?�???�???� ?? ???????�???�?�???�?????? ?? ??????. 15.60 . ???????�???�?� ?????�?????� ?? ???�???�?�?? ?? ?? ???�?�?????�?�????, ?�?�?? ?????�?????� ???�?�???????� ???� ?????�?????????????? ?�???�???�???�. ?�?�?�?�?? ???????�???�?� ???� ???????�?�???�?� ???�?�???�???� ???�???????�?�?????� ???� ?�???????????�???�?????????? ?�?�?�?�???�?? ??� ?????�?????� ?????�?�?�?? ???�?�???????�?? ???� ???�???�?�???� ?�. ?????? ???�?????�?�?�?�?�?????�?� ???�?�???�???�?�?�?�?� ???????�?�?�?????? ?�?�???�?????�?� ???�?�???�??. Replacement of components ?�???� ???�?�???�???� ???????????????? ?????????�?????????�???� ?? ?�?�?�???? ?�?????????�?�???�, ???????�?????? ???� ?�?�???�???� ?? ???�???�?�?????????�?? ???�?????�?????�???�. ?�?�?? ?�?�???�???� ???�?�???�???� ???????????????? ?��3 ???�?????�?????????�?� ???�?�?????? ???? ???????????? ?? ???????????�?????????�?� ???� ?? ???????????? ???�?�???�????. ?�?�?? ???????�???? ???????????????? ?�?�?????�???�?�???????????? ???�?�???�???� ???�?�?�?????�?� ?????????�?�?�?�??, ?�?�?�?�?? ???�?�???�?� ???�?�?�?�???�???�???? ?�???????????�?? ???? ???????????? ?????�?� ???�?�???�???�. ???�?????�?????????�?� ?????� ???�???????????�?� ???�?�?????� ?? ???�???�???????�?� ???�?�???�?? ???� ?????????????????? ?????�?�?�???�?????�. ???�???�?? ?????�?�???????????? ???�?�???????�?� ???�?�???�???????? ?�?�???�?? ???�?�???�???� ?�?�?�?�???????????? ?�?�???�????. ?????????�?????�?� ?�?�?�?????�?? ?�?????�???? ???�?�????????. ???�?�???�???� ?�???�?�???? ???�?? ?�?�?�???�?????�???�?????? ?????�?�?� ?�?�?�?? ???????�???????? ???�???????�?????? ???�?????�?�???�???????�??. ?�?�???�???????�?� ???�?�???�?? ???� ????????, ?�?�?�?�?? ???�???�?�???? ?�?�?�???????�?� ???�???�????. ???�???�?????�?� ???�?�?????? ???� ???�???�?�???� ???�?�???�???� ?? ?????????�?�?????????�?� ?????????�???? ???�?�?�?�???�???�?�?? ?�???????????�??.
| Fig. 15.11. Elements of fuel supply system 1 - the fuel filter (at high pressure line); 2 - a fuel distribution line; 3 - nozzle; 4 - a tank; 5 - control valve of the pressure regulator; 6 - tank fuel filter (suction side); 7 - the fuel pump; 8 - three-way control valve
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?????�?�?�???????????? ???????�?????�?????�?? ???�?�???�?? ?????�?�???????�?�?? ?????????? ?? ?�?????�???????�?? ?�?�?????? (????. ??????. 15.11 ). ?�?�?? ?????�?????�???????? ???�???????? ???????????�?????�?� ?�?????????? ?�?�???�???? ???�?�????, ?�?�?�?�?? ?????�?�?�???�?� ?�???????�?� ?? ???�?????�?????????�?� ???�?�?????? ???� ???�?�???�???�. ?�?�???�???????�?� ???????�?� ?? ???????????�?� ???�?�???�??. ?????? ???�?�???�???? ?�???�?�???? ?? ?�?�?�???�?????�???�?????? ???�?�???????? ?�?�???�?????�?� ???�. Installation is performed in reverse order of removal. ???�???�?????�?� ???�?�?????? ???� ???????�???�?�???�???????�???� ???�???�?�???� ?? ?�?�?????�?????�?� ?�???????�?�????.
| Fig. 15.14. Location of engine electronic control system without turbo: 1 - three-way solenoid valve; 2 - control valve of the pressure regulator; 3 - the gauge of atmospheric pressure; 4 - three-way solenoid valve; 5 - control unit; 6 - the fuel pump relay; 7 - the intake air temperature sensor; 8 - Control damper; 9 - the main relay; 10 - meter air flow; 11 - thermal switch; 12 - Analog coolant temperature sensor; 13 - the gauge of concentration of oxygen; 14 - air valve; 15 - the thermostat; 16 - controlling the EGR valve; 17 - pneumatic shock absorber; 18 - recirculation valve modulating; 19 - the gauge of the opening angle of the throttle; 20 - bypass solenoid valve
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| Fig. 15.15. Location of engine electronic control systems with turbo 1 - samorazblokiruyuscheesya fuel pump relay; 2 - control valve of the pressure regulator; 3 - three-way solenoid valve; 4 - the control unit; 5 - intake air temperature sensor; 6 - check the air valve; 7 - the main relay; 8 - meter air flow; 9 - analog coolant temperature sensor; 10 - thermal switch; 11 - the gauge of concentration of oxygen; 12 - air valve; 13 - controlling the EGR valve; 14 - position sensor EGR; 15 - the case of the reed valve; 16 - pneumatic shock absorber; 17 - throttle device; 18 - solenoid valve recycling; 19 - bypass solenoid valve; 20 - pressure switch; 21 - the gauge of atmospheric pressure
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?????�?�?�???????????? ???�?�???�???????�???????�???�?? ???�???????�???�?�???�?�?�?? ?????�?�???????�?�?? ???� ???�?�?????� ?????�???????????? ???�???�???�, ?? ?�???�???????????�???� ?�???�???????�???�?�?? ???? ???�?�???????�???? ???� ???�?????? ?�?�?????? ?????�?? ???�???�?�?? (????. ??????. 15.14 , 15.15 ). ?�?�?? ???????�???? ???�?�???�???� ???????????�?????�?� ?�?????????? ?�?�???�???? ???�?�???? ???� ???�?�??????, ?�?�???�?� ?????? ???�???????� ?????�?�?????????�?? ???� ???� ?????�?�???�?� ???�???�??, ?�?�?�?�?? ???????????�?� ???�?�??????. ???�?????�?????????�?� ???�?�???�??, ???�?�?�?????????? ???�???�???�?????? ???�???�?�?????�?� ???�?????????????� ?????�???�?? ?? ???�?�???????�?� ???�?�???�?? ???� ???�???�?�??. Installation is performed in reverse order of removal.
???????�?�???� ???�???�???�???�???? ???�???�?�???� (PCV) ???????�?�???� ???????????????�?�?�???????? ???�???�???�???�???? ???�???�?�???� ?????????�?�?�?�?�?? ?? ???????�?�?????? ???????�?????� ?�?????�?????� ?�???�?�???????�???� ???????�?�???�, ?????????�???????? ?? ???�?�??. 8 ?�???????�?�???� ???????�?�?????? ?�?????????�???????�?? ???�???�?�???�?�???????� ???�?�?????�. ?????????�?????� ?�???�???�???????????????? ?????�?????????�???� ???�?�???�?�?�?�???? ???� ?????????�????????. ???????????�???�?� ?????????�?�?�?�?? ???? ?????????�?�???????? ???�?�???�?�?? ?�?�?????�???�?�?????� ?? ?????�?�?????�?� ???�?�???�?�?�?? ???� ?�???�?????�???? ?�??????. ???�???�?�?????�?� ???� ?????�?????? ?????�???????? ?�?�?????� ?�???�???????????? ?�???�???�?????????????� ?????�?????????�???? ?? ???????�???�???�?� ?? ???�???? ???�?�?�?�. ?�???�?? ?�?�???�???�?� ?????�?�?�?????? ?????�?�???�?�?�?????? ???�?�?� ?????????�?�?�?�?? ???� ?�???�?????�???? ?�?????? ?????�?????????�????, ?�???�?�???�, ?�???�???�?????????????� ?????�?????????�???? ?????????�??????.
???????�?�???� ???�?�?????????�???�???? ???�???�?�???�?�???????� ???�?�???? Exhaust gas recirculation is used to reduce the content of nitrogen oxides of exhaust gases by directing a portion of the gases into the intake manifold. Operation of the system depends on the degree of vacuum, exhaust gas pressure, temperature of cooling fluid, and on engines with turbocharger and the engine load and speed. Check EGR Check the condition of the vacuum hoses. Not allowed excesses, weakening the density of their landing, twisting and tears. On vehicles from 1988-1991. issue, make sure that the diaphragm valve for recirculation moved easily without jamming; To do this, insert a hand under the valve and press on the diaphragm. Start up the engine and make sure that when the frequency of rotation of the crankshaft of the engine the diaphragm moves up. On vehicles 1986 and 1987. release disconnect the EGR valve vacuum hose and close the stopper, the nature of the engine should not be changed. Otherwise, the check valve. To disconnect the hose, connect the vacuum gauge (for turbocharged engines). At idle, the vacuum should not be, the gauge should show a vacuum at the speed of the crankshaft of the engine 2500 min -1. Otherwise, check the solenoid valve recycling. Attach the hose. On vehicles 1986 and 1987. issue with non-turbo engine, disconnect the hose from the smoothing recirculation valve and close the cap. To release the fitting smoothing valve, attach a piece of hose, bring the frequency of engine speed to 2500 min -1 Blow into the hose and watch the gauge readings, which should increase. If vacuum does not increase, smoothing check valve. Connect hoses. On vehicles equipped with the turbo engine, between the solenoid valve and the recirculation control valve recirculation switch the gauge. Increase the speed of the crankshaft of the engine and read the gauge. Then disconnect the hose from the EGR valve and close the cap, the reading should be less than the previous one. Otherwise, check position sensor and solenoid valve recycling recycling. At the muffled vacuum hose disconnect the connector from the temperature switch on coolant expansion tank. Bring the engine speed of the engine to 2500 min-1 - the gauge does not have to register a vacuum. Otherwise, check the solenoid valve recycling.
| Fig. 15.61. Disconnecting the hose (1) and connected instead of the vacuum gauge to test the smoothing recirculation valve
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On vehicles 1986 and 1987. issue with non-turbo engine, disconnect the hose from the smoothing recirculation valve and instead connect the vacuum gauge (Fig. 15.61). Bring the engine speed of the engine to 2500 min -1, and the gauge readings should not be less than 150 mm Hg. Art. If the reading is different, check out the three-way solenoid valve. Disconnect the connector from the temperature switch on the expansion tank - the gauge does not have to register a vacuum. Otherwise, check the three-way solenoid valve. To check the recirculation control valve in engines with and without turbocharging the engine warm up to normal operating temperature, then disconnect the hose from the smoothing valve and close the stopper; the nature of the engine should not be changed. Otherwise, remove the valve and clean the channel of the exhaust valve and cravings.
| Fig. 15.62. Check smoothing EGR valve: a - the direction of purging
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Connect the recirculation control valve and vacuum pump to apply a vacuum of at least 75 mm Hg. Art. The engine should start to run rough or stall. If it does not, replace the valve. To test the smoothing recirculation valve (only in the non-turbo engines) must be removed from the engine. By fitting ?��3 connect the vacuum pump, close the plug and socket ?��1 when the pump is running Blow in fitting for exhaust gases - vacuum should not change (Fig. 15.62). After removing the pressure fitting for exhaust gas dilution should not be maintained. If depression persists, replace the smoothing valve. To check the recycling position sensor (only with turbocharged engines), remove the rubber cover from the sensor connector without disconnecting the connector.
| Fig. 15.63. Measuring the voltage on pin connector position sensor
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Disconnect the vacuum hose from the control valve recycling and connect the vacuum pump. Turn the key in the ignition switch in the ?�ON?� position and measure the voltage on each pin connector (Fig. 15.63). Measurement conditions are shown in Table. 15.15.
Table 15.15 Changing the voltage at the terminals of the connector position sensor as a function of dilution If the voltage at the terminals "A" and "B" is different from the values given in the Table. 15.15, check the wiring and turn on the check in service center management unit. If a different voltage on pin "C", check the resistance of the sensor, then check the wire and turn the control unit to check the service center.
| Fig. 15.64. Measure the resistance between terminal connector position sensor
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Disconnect the connector and measure the resistance between the contacts of the position sensor (Fig. 15.64). If any resistance is different from that given in the Table. 15.16, replace the recirculation control valve assembly (position sensor alone is not supplied).
Table 15.16 The resistance between the connector pins on the position sensor
Recirculation solenoid valve (only with turbocharged engines) consists of two valves - ventilation and vacuum. To check the vent hoses and disconnect the purge vent - air should pass freely.
| Fig. 15.65. Pin connector, which must be energized from the battery when checking vent solenoid valve 1 - "mass"; 2 - positive battery voltage
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Disconnect the connector and apply a voltage from the battery to the connector pins in accordance with Fig. 15.65. Again blow vent - air must pass through, otherwise replace the valve. To check the valve, disconnect the vacuum hose and blow the vacuum channel - the air should not pass.
| Fig. 15.66. Pin connector, which must be energized from the battery when the EGR valve check: 1 - a vacuum hose; 2 - "mass"; 3 - positive battery voltage
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Disconnect the connector and apply a voltage from the battery to the connector pins in accordance with Fig. 15.66. Again blow vacuum channel - the air must pass freely, otherwise replace the valve. Replacement of the exhaust gas recirculation Remove the check valve recycling only after full cooling of the engine. Mark and disconnect vacuum hoses, remove the three screws and remove the valve. Remove the remaining pads with contact surfaces of the valve. Installation is performed in reverse order of removal. To remove the smoothing recirculation valve label the tape all hoses to ensure they are connected properly. Release the spring clip and remove the valve. Installation is performed in reverse order of removal. If defective position sensor recycling, it is necessary to replace it in the collection, because the sensor is not sold separately. To replace the EGR valve label the tape all hoses to ensure the correctness of their connection, and disconnect them. Unscrew the nuts and remove the solenoid valve from the wall of the engine compartment. Installation is performed in reverse order of removal.
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