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)
   - 5.3. Power supply system (l engines 2,0 and 2,5)
      5.3.1. Introduction
      5.3.2. Technical characteristics
      5.3.3. Dumping of pressure in fuel system
      5.3.4. Fuel pump and fuel pressure
      5.3.5. Fuel tubes and connections of tubes
      5.3.6. Fuel level measuring instrument sensor
      5.3.7. Fuel tank
      5.3.8. Casing of the air filter
      5.3.9. Accelerator rope
      5.3.10. Electronic system of injection of fuel
      5.3.11. Casing of a butterfly valve
      5.3.12. Fuel pressure regulator
      5.3.13. Fuel highway and injectors
+ 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


5.3.10. Electronic system of injection of fuel


The pulse multipoint system of injection of fuel includes three subsystems: system of an intake of air (air filter, airintaking branch pipes, air stream sensor, throttle, control system of idling and inlet collector), system of electronic control and fuel supply system (fuel pump, fuel pressure regulator, fuel injectors and fuel highway, relay of fuel system).


Check of system of electronic injection of fuel includes check of functioning of all its subsystems and elements of subsystems.

1. To check injectors, start the engine and apply a special stethoscope to each of them. If you hear clicks, so the injector functions normally.
2. If the injector does not click, connect a special lamp to contacts of a wire of an injector. If the lamp blinks, so on contacts of an injector the correct tension moves.
3. Kill the engine, disconnect wires from the general sockets of injectors and measure resistance of each injector of the right head of the cylinder, having connected one of ohmmeter wires to contact And, and another in turn to each of other three contacts.
4. Similarly measure resistance of each injector of the left head, having connected one iz of wires of an ohmmeter to contact of D, and another in turn to each of other three contacts (1 – the left head, 2 – right). Compare the received results to technical requirements.
5. If necessary remove injectors and measure resistance of injectors, having connected an ohmmeter to its contacts.
6. Measure resistance of wires of injectors.