8.19. System of recirculation of the fulfilled gases (EGR) - the general information, check of a state and replacement of components
General information
For the purpose of decrease in issue in the atmosphere of oxides of nitrogen a part of the fulfilled gases comes back to the inlet pipeline via the EGR valve. Such admixture of the fulfilled gases to air-fuel mix leads to decrease in temperature of its combustion.
The system consists of the EGR valve, the electromagnetic valve of management of EGR (it is used only on some models), the sensor of opening of the EGR valve and the module of management (ECM/PCM). ECM/PCM is programmed so that to provide optimum extent of opening of the EGR valve for any operating conditions of the engine. The special information sensor constantly traces extent of opening of the EGR valve, giving the corresponding signals on the module of management. ECM/PCM compares the entering information to the data arriving from other sensors and, in case of need makes adjustment of depth of the depression given on the EGR valve via the electromagnetic valve of management.
Check
The models equipped with CVT
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1. Start the engine and warm up it up to the normal working temperature (the fan of the cooling system has to turn on).
2. Disconnect a vacuum hose from the EGR valve and connect to it the vacuum gage.
3. Depression has to be absent if this condition is satisfied, pass to performing procedures of paragraph 5.
4. If depression takes place, disunite the socket of the electromagnetic valve of management of EGR and again check existence of depression on the EGR valve.
5. If depression was not from the very beginning, connect the manual vacuum pump to the EGR valve and create depression of 203 mm of mercury in depth. – the engine has to decay. Check also ability of the valve to hold depression if such ability is absent, replace assembly.
6. Check presence of tension of the battery on the electromagnetic valve of management of EGR. Disunite the 2-contact socket of the valve and connect the voltmeter between the positive plug of the socket of the main plait (the plug of a red wire) and weight. Battery tension has to take place.
7. Connect the vacuum gage to a vacuum hose of the EGR valve and start the engine on single turns. By means of a wire crossing point connect the positive plug of the battery to the plug of a red wire from a reverse side of the socket from a plait. Watching indications of the vacuum gage, ground the second plug of the 2-contact socket by means of the second wire crossing point. Depth of depression has to increase within one second (the sound of operation of the electromagnetic valve has to be heard). If depression is absent, replace assembly of the electromagnetic EGR valve.
8. More detailed diagnostics of system demands use of the special reader and has to be made in the conditions of a workshop of car service.
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Models with RKPP
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1. Start the engine and warm up it up to the normal working temperature (the fan of the cooling system has to work).
2. Disunite the 6-contact socket of the EGR valve and make sure available battery tension between plugs of pink and black wires of the main plait of an electrical wiring. If tension is absent, check a pink wire on the site between the valve and ECM/PCM for existence of signs of break and weakening of fastening of contact connections. Also check reliability of grounding of a black wire. If an electrical wiring as it should be, the car has to be driven away on car repair shop for detailed diagnostics of ECM/PCM.
3. If tension of the battery takes place, kill the engine. By means of a wire crossing point connect the positive plug of the battery to the plug of a pink wire of the 6-contact socket of an electrical wiring of the EGR/sensor valve of extent of its opening. Start the engine on single turns and by means of the second wire crossing point ground the plug of a black wire of the socket. Stability of turns of idling has to be broken sharply, up to an engine stop, otherwise replace assembly of the valve/sensor. If no changes in operation of the engine happen, check an electrical wiring for break and reliability of fastening of contact connections.
4. More detailed diagnostics of system demands use of the special reader and has to be made in the conditions of a workshop of car service.
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Replacement of components
EGR valve
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1. Disconnect an electrical wiring from the sensor of opening of the EGR valve. Disconnect a vacuum hose.
2. Give two fixing nuts and remove the EGR valve from the inlet pipeline.
3. Smooth out the interfaced surfaces of the valve and its transitional nozzle.
4. Replace sealing laying and install the EGR valve on the regular place. Strongly tighten fixing nuts.
5. Restore initial connection of an electrical wiring. |
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The electromagnetic valve of management of EGR (only models with CVT)
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1. Having passed on a vacuum hose from the EGR valve, find the electromagnetic valve of management of system. Disconnect an electrical wiring and vacuum hoses, turn out fixing screws and remove the valve.
2. Installation is made upside-down.
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