Mazda 626

1991-1998 of release

Repair and car operation



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. Pressure release from a power supply system
      5.2.4. 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
   + 5.3. Power supply system (l engines 2,0 and 2,5)
+ 6. Exhaust system
+ 7. Transmissions
+ 8. Coupling and semi-axes
+ 9. Brake system
+ 10. Running gear
+ 11. Body
+ 12. Electric equipment
+ 13. Electroschemes
+ 14. Good advice



5.2.4. Fuel pump / pressure in a power supply system

GENERAL INFORMATION

Identification of plugs of the main relay of electronic injection of fuel (model of 1990-1994 of release)


Identification of plugs of the relay of disconnection of a chain / fuel pump

Identification of plugs of the relay of the fuel pump (model after 1995 of release)

Check of the fuel pump

PERFORMANCE ORDER
1. Connect F/P or GND plugs of the diagnostic socket a wire.
2. Uncover a jellied mouth of a fuel tank.
3. Turn a key in the ignition lock in the situation ON.
4. The fuel pump should turn on.
5. If is not present, check existence of tension of the accumulator on the socket of connection of the fuel pump. Measure tension between a wire of B/P of the socket of connection of the pump and "weight". It should equal 12 Volts.
6. If is not present, check a safety lock of system of electronic injection of fuel and the pump relay.
7. If everything is all right, check conductivity existence between B/P and B plugs of the socket of connection of the pump.

8. If conductivity is not present, check grounding of the pump and replace the pump if it is necessary.

Check of pressure of fuel
9. Let out pressure from a power supply system and connect a manometer by means of a tee to a hose of supply of the fuel, going from the fuel filter to the engine. Measure the pressure created by the fuel pump, near the fuel filter.
10. Execute the operations described in points 1-3, and check pressure of fuel.

11. Start the engine, leave it to work in a mode of idling and again check pressure of fuel.

12. Muffle the engine and check, that pressure of fuel did not fall below the minimum admissible. If pressure falls, possibly, in a pressure regulator, the fuel pump or injectors there is a leak.
Check of a regulator of pressure of fuel
13. Check pressure of fuel. Connect the vacuum pump to a regulator of pressure and check, that pressure of fuel decreased at increase in depression.
14. Connect a vacuum hose to a regulator and start the engine. Disconnect a hose and check, that pressure of fuel increased. If pressure of fuel when idling too high, check, whether there is no leak in a branch pipe of supply of air or an inlet collector. If is not present, replace a regulator of pressure of fuel.
15. If pressure of fuel is lowered, press a hose of the return pipeline. If pressure does not increase, means, the fuel pump is faulty or the tube of supply of fuel is littered.
16. If pressure of fuel too high, check, whether the return pipeline is littered. If is not present, replace a regulator of pressure of fuel.
Check of the main relay, relay of disconnection of a chain (early models) and relay of the fuel pump (late models) systems of electronic injection of fuel
Tension check
17. Remove the main relay of system electronic вспрыска fuels (it is specified by an arrow fig. at the left) and check, that at ignition inclusion on plugs A and B of the main relay there was a tension of the accumulator (fig. on the right).
18. Check, that at ignition inclusion on plugs of light green and white-red wires (early models) or between plugs of white-red wires (late models) the relay of fuel pump / disconnection of a chain was tension of the accumulator.
Main relay of system of electronic injection of fuel

19. Check, that the relay clicked at ignition inclusion / switching off.

20. Check conductivity existence between relay plugs A and B. When giving tension on plugs A and B, there should be a conductivity between plugs C and D.
21. Check resistance between plugs of the relay of fuel pump / disconnection of a chain:
– between STA and Е1 – 21–43 Ohm;
– between In and Fc – 109–226 Ohm;
– between plugs B and Fp there should not be a conductivity.
The relay of the fuel pump (model after 1995 of release)

22. Check, that between plugs A and B there was a conductivity. When giving tension on plugs A and B, there should be a conductivity between plugs C and D. Replace the relay if it is necessary.