Mazda 626

1991-1998 of release

Repair and operation of the car

Mazda 626

+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engines
+ 4. Heating and ventilation
- 5. Fuel system
   + 5.1. Nikki 30/34 carburetor
   - 5.2. Power supply system (l engines 1,6 and 1,8)
      5.2.1. Introduction
      5.2.2. Technical characteristics
      5.2.3. Release of pressure from a power supply system
      5.2.4. The fuel pump/pressure in a power supply system
      5.2.5. Fuel tubes and connections
      5.2.6. Removal and installation of the fuel pump
      5.2.7. Fuel level sensor
      5.2.8. Fuel tank
      5.2.9. Air filter
      5.2.10. Accelerator rope
      - 5.2.11. System of electronic injection of fuel General description Check and replacement of elements
   + 5.3. Power supply system (l engines 2,0 and 2,5)
+ 6. Exhaust system
+ 7. Transmissions
+ 8. Coupling and half shafts
+ 9. Brake system
+ 10. Running gear
+ 11. Body
+ 12. Electric equipment
+ 13. Electrical circuitries
+ 14. Useful tips

5.2.11. System of electronic injection of fuel General description


Scheme of system of electronic injection of fuel of models 1990-1994 of year of release

1. Casing of the air filter
2. Resonator branch pipe
3. The air stream sensor (with temperature sensor)
4. Vacuum chamber * 1
5. Fuel interruption in supply valve
6. Blowing-off valve of the coal filter
7. *
8. The electromagnetic valve * 2 (the operating pressure regulator valve)
9. *
10. Coal filter
11. Pressure regulator
12. Fuel filter
13. Control valve
14. Control and locking valve
15. Separator
16. Fuel tank
17. Fuel pump
18. Fuel filter

19. *
20. Oxygen sensor
21. Valve of ventilation of a case
22. *
23. Injector
24. *
25. Sensor of temperature of cooling liquid of the engine
26. The closing valve
27. Air valve
28. Air supply adjustment valve
29. *
30. Sensor of provision of a butterfly valve
31. *
32. Shock-absorber
33. Camera of the resonator
34. *
35. *

* To an electronic control unit operation of the engine

The scheme of system of electronic injection of fuel of models after 1995 of release

1. Capacity for collecting vapors of fuel
2. Blowing-off valve (top)
3. Blowing-off valve (lower)
4. Blowing-off valve (top)
5. Sensor of position of the camshaft
6. Electromagnetic valve
7. Sensor of provision of a butterfly valve
8. Sensor of closing of a butterfly valve
9. Air stream sensor
10. The sensor of temperature of the arriving air
11. Air filter
12. Sensor of opening of the valve of recirculation
13. Recirculation sensor
14. Electromagnetic valve
15. Valve of recirculation (ventilating)
16. Valve of recirculation (vacuum)
17. Air supply adjustment valve
18. Electromagnetic valve
19. Air valve
20. Locking valve
21. Vacuum chamber

22. Injector
23. Sensor of provision of a bent shaft
24. Sensor of temperature of cooling liquid
25. Oxygen sensor (forward)
26. Catalytic converter
27. Oxygen sensor (back)
28. Fuel pump
29. Fuel filter
30. The valve preventing fuel leak
31. Drain hose
32. Control valve
33. Pressure regulator
34. Coal filter
35. Control valve
36. Fuel pump
37. Ventilating valve
38. The valve of adjustment of pressure in the fuel tank
39. Fuel filter
40. Control valve

The system of electronic injection of fuel consists of three subsystems: a power supply system, system of air supply and the electronic operating system.

Power supply system

The fuel pump pumps up fuel in a fuel collector from where it through injectors comes to cylinders. The amount of the fuel injected by injectors is controlled by an electronic control unit.

System of air supply

The system consists of the air filter, the case of a butterfly valve, a connecting branch pipe and the sensor of temperature of the arriving air.

Electronic control system

The electronic control system controls system of injection of fuel and other systems by means of an electronic control unit which receives signals from various sensors watching temperature of the arriving air, the angle of opening of a butterfly valve, temperature of cooling liquid, speed of rotation of a bent shaft, speed of the movement of the car and contents WITH in exhaust gases.

1. Check reliability of connections of wires and reliability of grounding.
2. Check accumulator charging.
3. Check the air filter.
4. Check safety locks.
5. Check a branch pipe of air supply and an inlet collector for existence of leaks. Check whether the branch pipe of air supply and a casing of a butterfly valve got littered. Clear it if it is necessary.
6. Check injectors, having listened to their work by means of a stethoscope.
7. Check injectors by means of a control bulb.
8. Check resistance of injectors.
9. For more detailed check of system it is necessary to address experts.