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
      5.1.1. Work principle
      5.1.2. Identification
      5.1.3. General maintenance
      5.1.4. Carburetor adjustment
      5.1.5. Check of elements of the carburetor
      5.1.6. Diagnostics of malfunctions
   + 5.2. Power supply system (l engines 1,6 and 1,8)
   + 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



5.1.5. Check of elements of the carburetor

GENERAL INFORMATION

SYSTEM OF SUPPLY OF HOT AIR

Operations of check of system of supply of hot air are described in subsection 5.1.1.

HEATER OF THE INLET COLLECTOR

Scheme of system of a heater of an inlet collector

1. Ignition lock
2. The temperature switch which is heated up by cooling liquid of the engine
3. Heater of an inlet collector
4. Heater relay
5. Accumulator

PERFORMANCE ORDER
1. When the engine cold (the temperature of cooling liquid is lower 60 ° C), connect the voltmeter between a food wire on a heater (usually thick red wire) and "weight". If the voltmeter does not register tension of the accumulator, check the temperature switch and the heater relay.
2. Connect the voltmeter between a wire of grounding of a heater (a black wire) and "mass" of the car. Tension registered by the voltmeter should be very low (0,25 Volts or less). If tension is higher, check reliability of grounding of a heater.
3. Disconnect wires of connection of a heater and connect between them an ohmmeter. Replace a heater if conductivity is absent (resistance there should be 1,0 Ohm or less).

TEMPERATURE SWITCH

PERFORMANCE ORDER
1. Connect the voltmeter between a wire of a food of the temperature switch and "weight". Traceable tension should be very low (0,25 Volts or less) as grounding is carried out via the temperature switch.
2. If traceable tension exceeds 0,25 Volts, means, the temperature switch partially or is completely open. Check it, having disconnected wires and having connected an ohmmeter between plugs of the temperature switch. The ohmmeter should show that the chain is opened, if the switch is open, and, therefore, the switch is faulty. If the ohmmeter shows that the chain is closed (that testifies to serviceability of the switch), check the wire of grounding connecting the switch to "mass" of the car.
3. Disconnect a grounding wire, on a wire of a food there should be a rated voltage of the accumulator. If is not present, check the heater relay.
4. When the engine hot (the temperature of cooling liquid is higher 60 ° C) and ignition is included, tension on a wire of a food of the temperature switch should equal to rated voltage of the accumulator as the chain should be opened by the switch.
5. If traceable tension is lower, check the temperature switch on conductivity as it is described above. The switch should disconnect a chain when the engine hot if is not present, means, it is faulty.

HEATER RELAY

Scheme of the relay of a heater of an inlet collector
 

PERFORMANCE ORDER
1. When ignition is included, check, that on the plug 1 there was a rated voltage of the accumulator. If the potential is not present, check connecting wires to the ignition lock.
2. Check existence of rated voltage of the accumulator on the plug 3 (when ignition is included or switched off). If the potential is not present, check connecting wires to the accumulator.
3. Temporarily earth the plug 2 and check existence of tension of the accumulator on the plug 4. If the potential is not present, replace the relay.

VALVE OF INTERRUPTION OF SUPPLY OF FUEL

PERFORMANCE ORDER
1. Include ignition, and then switch off it; the valve should click at key turn in the ignition lock.
2. Connect the voltmeter between a wire of a food of the valve and "weight". If the voltmeter does not show tension of the accumulator, check connecting wires to the power supply (a food joins the ignition lock).
3. Check work of a plunzher of the valve, having disconnected the socket of connection of the locking valve. Temporarily connect a cap wire the positive plug of the accumulator and a wire of a food of the valve, and also the negative plug of the accumulator and the case of the electromagnetic valve (or a wire of grounding of the valve if is available).
4. Submit and clean tension several times and check clearness of a course of a plunzher. Replace the valve if it is faulty and cleaning will not improve its work.

SYSTEM OF INTERRUPTION OF SUPPLY OF FUEL AT DECREASE IN TURNS OF THE ENGINE (IF IT IS ESTABLISHED)

The weights plug on the connection socket


PERFORMANCE ORDER
1. Connect the voltmeter between the weights plug on the socket of connection of the valve and "mass" of the car.
2. When the engine works in an idling mode, tension should make less than 1,5 Volta.
3. Increase frequency of rotation of a cranked shaft; when frequency of rotation of a cranked shaft will rise above 2300 rpm, the voltmeter should show rated voltage of the accumulator.

SYSTEM OF PAUPERIZATION OF THE FUEL MIX AT DECREASE IN FREQUENCY OF ROTATION OF THE CRANKED SHAFT

Voltmeter use for check of system of pauperization of a fuel mix
V.Klemma of the valve of system of pauperization of a fuel mix

PERFORMANCE ORDER
1. Warm up the engine to normal working temperature, then connect the voltmeter between the plug "V" on the socket of connection of the valve of system of pauperization of a fuel mix and "weight".
2. Lift frequency of rotation of a cranked shaft approximately to 3000 rpm. Tension registered by the voltmeter should be close to zero.
3. Quickly close a butterfly valve and at reduction of frequency of rotation of a cranked shaft the valve should publish a hissing sound; indications of the voltmeter should fall to zero. Then indications of the voltmeter should increase to rated voltage of the accumulator at decrease in frequency of rotation of a cranked shaft below approximately 2100±100 rpm.
4. Check a course of a plunzher of the valve, having disconnected the socket of connection of the valve of system of pauperization of a fuel mix. Connect a cap wire the positive plug (+) the accumulator and the plug of a food of the valve and the second cap wire the negative plug (-) the accumulator and a grounding wire.
5. Submit and clean tension several times; the valve should click when giving and tension removal.

SWITCH OF SYSTEM OF IDLING

Voltmeter use for switch check

1. Adjusting screw

PERFORMANCE ORDER
1. Connect the voltmeter between two plugs on the socket of connection of the switch of system of idling; when the engine works in an idling mode, tension should equal to zero.
2. Lift frequency of rotation of a cranked shaft of the engine above 1250±50 rpm; the voltmeter should register rated voltage of the accumulator.

SYSTEM OF ENRICHMENT OF THE FUEL MIX AT DECREASE IN FREQUENCY OF ROTATION OF THE CRANKED SHAFT

Voltmeter use for check of system of enrichment of a fuel mix
E.Klemma "massy of the electromagnetic valve

Food giving directly on the electromagnetic valve of system of enrichment of a fuel mix

D. Plug of a food of the electromagnetic valve
E.Klemma "massy of the electromagnetic valve
PERFORMANCE ORDER
1. Warm up the engine to normal working temperature, then connect the voltmeter between the plug "E" on the socket of connection of the valve of system of enrichment of a fuel mix and "weight".
2. Lift the lever of the switch of system of idling in order that the switch opened a chain (1 – the switch of system of idling).
3. Open a butterfly valve and lift frequency of rotation of a cranked shaft to about 3000 rpm. At increase in frequency of rotation of a cranked shaft about 2300 rpm are higher, tension registered by the voltmeter should equal to rated voltage of the accumulator.
4. Quickly close a butterfly valve and at reduction of frequency of rotation of a cranked shaft to 2300–1500 rpm, indications of the voltmeter should fall below 1,5 Volts. When frequency of rotation of a cranked shaft will decrease below 1500 rpm, indications of the voltmeter should increase to rated voltage of the accumulator.
5. Check a course of a plunzher of the valve, having disconnected the socket of connection of the valve of system of enrichment of a fuel mix. Connect a cap wire the positive plug (+) the accumulator and the plug of a food of the valve and the second cap wire the negative plug (-) the accumulator and a wire of grounding of the valve.
6. Submit and clean tension several times; the valve should click when giving and tension removal.

BUTTERFLY VALVE DAMPER (IT IS ESTABLISHED ON SOME MODELS)

Adjustment of a damper of a butterfly valve
1. Lever

2. Lock-nut

3. Rod

PERFORMANCE ORDER
1. Warm up the engine to normal working temperature and check correctness of adjustment of speed of idling and quantity of a mix of idling
2. Leave the engine to work in an idling mode, then, open a throttle and lift frequency of rotation of a cranked shaft of the engine to 3000 rpm.
3. Completely close a butterfly valve; the rod of a damper should concern the butterfly valve lever at frequency of rotation of a cranked shaft in 2200±100 in rpm.
4. Adjust a butterfly valve damper that the rod of a damper concerned the butterfly valve lever at the specified frequency of rotation of a cranked shaft.
5. Release a pedal of an accelerator and a damper should return the butterfly valve lever to the provision of idling slowly.

THE MECHANISM OF POSITIONING OF THE BUTTERFLY VALVE (IT IS ESTABLISHED ON SOME MODELS)

Check ситемы butterfly valve positioning
1. Rod

PERFORMANCE ORDER
1. Leave the engine to work in an idling mode, then slowly open throttles and lift frequency of rotation of a cranked shaft approximately to 3000 rpm. When frequency of rotation of a cranked shaft will rise above about 2000 rpm, the rod of a diaphragm of system of positioning should be involved by a diaphragm.
2. Slowly close a butterfly valve; when frequency of rotation of a cranked shaft will decrease below about 1600-1800 rpm, the rod of system of positioning should be released, that the butterfly valve was closed.

DIAPHRAGM OF SYSTEM OF POSITIONING OF THE BUTTERFLY VALVE

Diaphragm check
PERFORMANCE ORDER
1. Disconnect vacuum hoses from a diaphragm and stop up a branch pipe of the hose going to the electromagnetic valve (if it is established).
2. Connect the vacuum pump to a vacuum branch pipe on a diaphragm and pump out air to receive depression in 300 m of a mercury column; the diaphragm should involve completely a rod and depression should remain within at least 30 seconds. Replace a diaphragm if it is faulty.

Adjustment
PERFORMANCE ORDER
1. When the engine works in an idling mode (and all electric equipment is disconnected), disconnect the vacuum hose of a diaphragm connecting it to the electromagnetic valve of system of positioning of a butterfly valve.
2. Connect a vacuum hose from an inlet collector to a branch pipe on a diaphragm, passing the electromagnetic valve of system of positioning of a butterfly valve; frequency of rotation of a cranked shaft of the engine should rise to 1050–1250 rpm.
3. Connect a hose from a vacuum branch pipe of an inlet collector to a branch pipe on a diaphragm
4. Connect the voltmeter between the weights plug on the socket of connection of the electromagnetic valve and "mass" of the car.
5. Adjust the connecting mechanism of a diaphragm, rotating the adjusting screw in the demanded direction.

ELECTROMAGNETIC VALVE OF SYSTEM OF POSITIONING OF THE BUTTERFLY VALVE

Check of the electromagnetic valve of system of positioning of a butterfly valve

A.Shlang from an inlet collector
V.Shlang going to a diaphragm of system of positioning of a butterfly valve
S.Patrubok

1. Tension giving in 12 Volts

PERFORMANCE ORDER
1. Connect the voltmeter between the grounding plug on the socket of connection of the electromagnetic valve and "mass" of the car; when the engine works in the idling mode, tension shown by the voltmeter should be almost equal to zero.
2. Lift frequency of rotation of a cranked shaft of the engine approximately to 3000 rpm and the voltmeter should show the tension approximately equal to tension of the accumulator.
3. Slowly close a butterfly valve, having reduced frequency of rotation of a cranked shaft approximately to 1600–1800 rpm; indications of the voltmeter should fall almost to zero.
4. When the engine works in an idling mode, disconnect the vacuum hose connecting the electromagnetic valve and a vacuum diaphragm, from a branch pipe on the electromagnetic valve; at a branch pipe there should not be a depression.
5. Disconnect the socket of connection and connect a cap wire the positive plug of the accumulator and a wire the plug of a food of the electromagnetic valve.
6. Connect a cap wire the negative plug of the accumulator and the plug of grounding of the electromagnetic valve; in a vacuum branch pipe depression should be formed.
7. If the valve does not function how it is required, check connecting wires of the electromagnetic valve and the electronic control unit and if they as it should be, check the electronic control unit.
8. Connect a vacuum hose and the connection socket on termination of check.

SYSTEM OF INCREASE IN FREQUENCY OF ROTATION OF THE CRANKED SHAFT WHEN IDLING (MODEL WITH STEERING HYDROSTRENGTHENING)

The scheme of system of increase in speed of idling at inclusion of system of hydrostrengthening of a steering
1. Ignition lock
2. The switch in system of hydrostrengthening of a steering
3. Diaphragm
4. The electromagnetic valve (operated by the switch in system of hydrostrengthening of a steering)

When the engine works in an idling mode, turn a steering wheel; the system of positioning of a butterfly valve should be activated and increase frequency of rotation of a cranked shaft. If is not present, carry out the following checks.

THE TEMPERATURE JACK OF SYSTEM OF IDLING AT HIGH TEMPERATURE OF THE ENGINE

The temperature jack of system of idling at high temperature of the engine

1. Jack valve

2. Carburetor

3. Inlet collector

PERFORMANCE ORDER
1. Remove the air filter.
2. Disconnect the vacuum hose going to the temperature jack, from a branch pipe on the carburetor and connect to this hose the vacuum pump.
3. Take temperature near the temperature jack; at temperature below 67 ° About the jack it should be closed. At temperature above 71 ° With, the jack should be open.
4. Wait, while the temperature of the jack will fall below 67 ° S.Pri pomoshchi of the vacuum pump, pump out air to receive depression in 500 mm of a mercury column; such pressure should remain within at least 10 seconds. If is not present, means, the valve of the temperature jack partially or is completely open, and it is necessary to replace it.
5. Heat up the temperature jack to temperature above 71 ° With; by means of the vacuum pump pump out air – pressure should not fall. If depression is formed, means, the valve temperature the jack is open not completely, and it is necessary to replace it.

AUTOMATIC AIR ZASLONKA

Power supply check

Operations of check of power supply of an automatic air zaslonka are described in subsection 5.1.1).