Daewoo Nexia

since 1994 of release

Repair and car operation

Deu Neksiya
+ Maintenance instruction
+ Maintenance
+ Engine
+ 3. Engine (two top camshafts)
+ cooling System
- Fuel and exhaust systems
   5.2. System of injection of fuel
   5.3. Modes of functioning of system
   - 5.4. Main knots of system
      5.4.1. Fuel tank, pump and pipelines
      5.4.2. Distributive fuel pipeline
      5.4.3. Fuel nozzles
      5.4.4. Regulator of pressure of fuel
      - 5.4.5. Butterfly valve case Idling valve Sensor of provision of a butterfly valve (DDZ)
      5.4.6. Relay of pressure of oil
      5.4.7. Relay of turning on of the fuel pump
      5.4.8. Check of giving of the fuel pump
      5.4.9. Fuel tank
      5.4.10. Accelerator pedal
      5.4.11. Fuel filter
      5.4.12. Fuel pump
      5.4.13. Dumping of pressure of fuel in system
      5.4.14. Distributive fuel pipeline
      5.4.15. Fuel nozzles
      5.4.16. Regulator of pressure of fuel
      5.4.17. Butterfly valve case
      5.4.18. Sensor of provision of a butterfly valve (DDZ)
      5.4.19. Valve of idling (KHH)
      5.4.20. Replacement of the case of a butterfly valve
      5.4.21. System of compulsory ventilation of a case (SPVK)
      5.4.22. Check of functioning of the valve of ventilation of a case (KVK)
      5.4.23. System of production of the fulfilled gases
      5.4.24. Catalytic converter
      5.4.25. Reception exhaust pipe and catalytic converter
      5.4.26. The forward exhaust silencer with an intermediate exhaust pipe
      5.4.27. The back exhaust silencer with an exhaust pipe
+ Electric chain
+ 7. Ignition system
+ 8. Electronic control unit and sensors
+ Transmission
+ 10. Five-speed transmission and main RPO MM5 broadcast
+ 11. Automatic Transmission
+ Steering
+ Running gear
+ 14. Forward suspension bracket
+ 15. Drive of forward wheels
+ 16. Back suspension bracket
+ Brake system
+ Body
+ Heating, ventilation
+ Electric equipment

8128da4b Idling valve


Idling valve


KHH locking element


EBU regulates operation of the engine idling by means of the valve of the idling (KHH) established in the case of a butterfly valve. KHH regulates frequency of rotation of a cranked shaft at the expense of dispensing of a consumption of air through the roundabout suited a parallel to a butterfly valve. The KHH step-by-step Engine copes EBU impulses. On each operating impulse the rotor of the engine turns on a certain corner, displacing by means of the screw mechanism a locking element of the valve concerning a saddle. Change of section of the valve through passage between a locking element and a saddle provides regulation of a consumption of air on the roundabout channel. By means of KHH EBU supports the set turns of the idling which values are stored in memory of EBU in the form of function from temperature of cooling liquid, a signal of the Parking / neutral switch, speed of the car, tension of the storage battery and pressure in a contour of central air of air. EBU defines the provision of the KHH locking element, proceeding from demanded frequency of idling of the heated-up engine for various conditions of its work (for example when the selector of an automatic transmission is in the situation "Parking" or "Movement", the conditioner is included or switched off etc.) . Values of frequency it is single го a course of the engine are stored in ROM where information remains and after ignition switching off. These data are a starting point for EBU at KHH current situation calculation. The similar algorithm of EBU excludes dependence of frequency of idling from different casual and систематичес ky factors, for example, from degree of wear of the engine or casual deviations of a butterfly valve from nominal situation at the released pedal of an accelerator. EBU provides automatic maintenance of frequency of idling at demanded level. On the other hand, at shutdown of a food of EBU normal operation of the engine idling can be broken. Thereof at start-up of the engine it can partially be necessary to press an accelerator pedal while EBU will not start to supervise engine idling automatically.

Frequency of idling of the engine depends on a consumption of the air arriving in an inlet collector. This total expense develops of a consumption of air through KHH, an expense through the covered butterfly valve and a small consumption of air through the vacuum hoses connecting the inlet pipeline to various vacuum devices. The initial provision of a butterfly valve at the released pedal of an accelerator is adjusted and fixed by the restrictive screw at manufacturer. This provision of a zaslonka provides a sufficient consumption of air in the inlet pipeline for KHH locking element installation in demanded discrete situation at automatic adjustment of frequency. It should be noted that with reference to this engine, the initial provision of a butterfly valve cannot be considered as situation corresponding to the minimum frequency of idling. The head of the restrictive screw of idling is closed by a cap.


It is forbidden to remove a protective cap of the restrictive screw and to make adjustment. The wrong adjustment can lead to damage of KHH or the butterfly valve case.

EBU makes updating of calibration of provision of the KHH locking element after each inclusion of ignition and achievement of speed of the car more than 48 km/h at moderate acceleration. Procedure of calibration includes complete retraction of a locking element, then its release before complete closing of the valve with the subsequent partial branch from a valve saddle in a standard position. When closing the EBU valve fixes initial the "zero" provision of a locking element from which counting of discrete steps is established. If after the described EBU procedure calibration in a condition to support nominal frequency of idling in a certain range of discrete provisions of the KHH locking element, the received calibration remains up to the subsequent switching off and inclusion of ignition, till the speed 48 km/h are higher than start-up of the engine and car dispersal. Otherwise EBU will repeat procedure of calibration of situation KHH until nominal frequency of idling of the engine will not be supported in the set range of discrete provisions of the KHH locking element.