Hyundai Accent

Repair and car operation



Hyundai Accent
+ 1. Maintenance instruction
+ 2. Engine
+ 3. Greasing system
+ 4. Cooling system
+ 5. Control, decrease in toxicity
- 6. Fuel system
   6.1. Specifications (SOHC and DOHC)
   6.2. Check of the fuel pump
   6.3. Check of the pressure created by the fuel pump
   6.4. Checks of system of injection of MFI
   6.5. Control lamp of malfunctions (MIL)
   6.6. Diagnostic codes of malfunctions of "OBD-II"
   6.7. Diagnostic codes of malfunctions, except «OBD-II»
   6.8. Replacement of the fuel filter
   6.9. Replacement of the limiter of overflow (the double-thread valve)
   6.10. Fuel level sensor replacement
   6.11. Control system of the MFI engine
   6.12. Fuel nozzles
   6.13. Throttle knot
   6.14. A power supply system with the carburetor
   6.15. Check of frequency of rotation of idling
   6.16. Adjustment of frequency of rotation of idling
   6.17. Frequency of rotation of idling and adjustment of a fuel mix
   6.18. Check and adjustment of the starting arrangement
   6.19. Check and adjustment of a free wheeling of a cable of an accelerator
   6.20. Fuel tank
   6.21. Catching canister паров fuels
   6.22. Replacement of the fuel filter
   6.23. Carburetor
   6.24. Cable and accelerator pedal
   6.25. Search and elimination of malfunctions of fuel system with the carburetor
+ 7. Ignition system
+ 8. Coupling
+ 9. Transmission
+ 10. Axes and power shafts
+ 11. Suspension bracket
+ 12. Steering
+ 13. Brake system
+ 14. Body
+ 15. Central air
+ 16. Electric equipment
+ 17. Appendix
+ 18. Electroschemes




6.11. Control system of the MFI engine

Placement of elements of a control system of MFI

1–measuring instrument of a consumption of OBD air;
2–the sensor of temperature of air arriving in the engine;
3–a measuring instrument of a consumption of air, except "OBD";
4–the sensor of a toplivovozdushny mix, except "OBD";
5–the sensor of temperature of cooling liquid;
6–sensor of provision of a butterfly valve;
7–sensor of provision of a camshaft;
8–sensor of an angle of rotation of a cranked shaft;
9–the warmed sensor of oxygen;
10-fuel nozzles;
11-modulator of frequency of idling;
12-sensor of speed of the car;
13-detonation sensor;
14-switch of ranges of a transmission;
15-ignition lock;
16-control unit ESM engine;
17-relay of central air of air;
18-the electromagnetic valve of cleaning of the canister with absorbent carbon;
19-main MFI relay;
20-ignition coils;
21-fuel pump;
22-acceleration sensor;
23-diagnostic socket.

Management of fuel system is carried out by the control unit the ESM engine (Engine Control Module). The ESM block carries out adjustment of a corner of an advancing of ignition, defines amount of fuel submitted to the engine, operates system of decrease in toxicity of the fulfilled gases and frequency of rotation of a cranked shaft of the engine idling, and also coupling of the compressor of the conditioner etc. The ESM block changes power setting depending on changing operational modes on the basis of signals from various switches and sensors.

For example, the ESM block regulates a corner of an advancing of ignition on the basis of signals of sensors which react to frequency of rotation of a cranked shaft, temperature of cooling liquid, the provision of the butterfly valve included at present of transfer, speed of the car etc.

The ESM block regulates frequency of rotation of a cranked shaft of idling on the basis of signals of sensors which react to the provision of a butterfly valve, the speed of the car included at present transfer etc.

The sensor of a measuring instrument of a consumption of OBD air (MAF – Mass Airflow Sensor)

The measuring instrument of a consumption of air provides the most direct method to measure engine loading as it measures amount of the air arriving in the engine. The stream of air arrives in the engine through a measuring instrument with warm and cold the wire elements forming a part of the bridge scheme. The current passing through a warm wire element, maintains its constant temperature at constant level, which above, than temperature of air arriving in the engine. The mass of air is determined by a current necessary for maintenance of temperature of a wire element. The more the stream of air and, naturally, its cooling, the is more than a size of a signal submitted on the ESM block.

The sensor of temperature of OBD air arriving in the engine (IAT – intake air temperature)

The sensor of temperature of air arriving in the engine represents a termistor which resistance changes depending on temperature. The ESM block considers a signal of the sensor and corrects width of the impulse submitted on nozzles therefore the amount of the fuel submitted to cylinders of the engine changes, and also changes a corner of an advancing of ignition.

Sensor check

PERFORMANCE ORDER
1. Measure tension between contacts 1 and 3 sockets of the sensor.
Temperature
Target tension
0°C
3,3–3,7 In
20°C
2,4–2,8 In
40°C
1,6–2,0 In
80°C