In the absence of special devices check of system of ignition can be carried out as follows:

- to check serviceability of the central wire of high voltage from the ignition coil to the sensor distributor. Resistance of a wire has to be no more than 500 Ohms;

- to disconnect the central wire of high voltage from the sensor of the distributor and to record a tip of a wire of high voltage at distance of 6 — 7 mm from the car case;

- to switch off ignition;

- a separate wire periodically to connect conclusions "+" and "Д" the switchboard. At the serviceable switchboard it has to cause a spark in a gap between a tip of a wire of high voltage and the case.

The periodic detachment from conclusion "Д" of the switchboard of a wire has to cause a spark in a gap between a tip of a high-voltage wire and the case of the car and fire of a control lamp.

If there is no spark, then it indicates malfunction in a sensor distributor winding. Serviceability of a winding of the sensor distributor is defined by an ohmmeter. Resistance has to be 400 — 450 Ohms.

Serviceability of the coil of ignition is also defined by an ohmmeter. Resistance of primary winding has to be 0,6 Om±20 of %, secondary — 16,5 кОм±20 in %.

To apply the A14BP spark plugs with the built-in resistor (8000 — 10 000 Ohms) to the engine.

Maintenance of spark plugs consists in check of their state, cleaning of a deposit and adjustment of a gap between electrodes. Before a vyvertyvaniye of a candle it is necessary to remove dirt with a brush or compressed air from a candle nest in a head of cylinders.

Candles should be checked after operation of the engine under loading. Operation of the engine idling changes character of a deposit on which it is possible to draw the wrong conclusions on work of a candle. It is necessary to unscrew candles only a special (candle) face key which is available in a set of the driver's tool.

At survey of candles it is necessary to check especially attentively whether there are no cracks on the insulator, to pay attention to character of a deposit, and also to a condition of electrodes and a gap between them. The conical part of the isolation center of a candle (skirt) should not have a deposit and cracks.

The candles having insulator cracks are subject to replacement.

During the work of candles on their skirts the henna-red raid which is not preventing work of candles is usually formed. This raid should not be mixed with a deposit, such candles do not need cleaning. Carefully clear candles with a deposit on the special sanding device E-203.

When cleaning the insulator it is not recommended to apply sharp steel objects as at the same time on its surface the scratches and roughnesses promoting further adjournment of a deposit are formed. If cleaning of candles cannot be made and the layer of a deposit is big, candles should be replaced.

Fig. 9.30. Check of a gap between electrodes of candles

After cleaning to check a gap between electrodes by means of the round wire probe (fig. 9.30).

Fig. 9.31. Adjustment of a spark gap in a candle

To make adjustment of a gap between electrodes at the expense of a podgibka of a side electrode (fig. 9.31). Gap size between electrodes has to be 0,8 — 0,95 mm.

To check the candles cleared of a deposit with the adjusted gaps between electrodes before installation for the engine on the device for tests of candles under pressure. At serviceable candles with a pressure of 800 — 900 kPa (8 — 9 ^kgfs/cm2) the spark has to appear regularly, trouble-free, between the central and side electrodes and without superficial category. With a pressure of 1000 kPa (10 ^kgfs/cm2) the new not working candle has to be completely tight: should not pass air neither on connection of the case with the insulator, nor on connection of the central electrode with the insulator. For the candles working at the engine the admission of air to 40 ^cm3/min. is allowed.

The candle has to be established into place surely with laying; to screw a candle at first a hand, and then to tighten a candle key. Laying represents the washer curtailed from thin metal and is calculated on smyaty at an inhaling.

At a wire detachment from normally working candle the speed of the engine decreases, and at a wire detachment from the damaged candle speed remains invariable. Idle candles or working with interruptions to the touch are colder than the others. Therefore, they can be found sometimes on this sign. Faulty work of candles — one of the reasons of fluidifying of oil in an engine case. At detection of the diluted oil, it needs to be replaced, and to check candles and the unemployed to replace.

The wires of high voltage made of a PVPPV brand wire have the core with a ferrite filler on which the spiral from a wire with a high ohmic resistance is reeled up (2000±200 Ohms on length meter). Wires with a distributive resistance reduce the level of the radio noise created by system of ignition.

At operation of the car it is necessary to watch, that on a surface of wires oil did not get that leads to their pollution and causes leakage of current and breakdown of isolation. For the purpose of removal from wires of dust and dirt they should be wiped with the napkin which is slightly moistened in gasoline.

The switch consists of the anticreeping mechanical lock and the electric switch. The key of the switch has four provisions:

III \ignition is switched off, and at the taken-out key the anti-theft device is switched on;

0 — ignition is switched off;

I \ignition is included;

II \ignition and a starter are included. Return to situation I automatic.

Secondary inclusion of a starter is possible only after transfer of a key to situation 0.

Fig. 9.32. Electric circuit of check of the switch of ignition: 1 — the rechargeable battery; 2 — a control lamp; 3 — a shtekerny block of the switch of ignition

For check of serviceability of the switch of ignition it is necessary to collect the electric circuit shown in fig. 9.32. At turn of a key in situation I (ignition is included) lamps have to burn And yes In, and in situation II (ignition and a starter is included) lamps have to burn And yes B. V provisions 0 and III of a lamp should not burn. Power failure between plugs 30/1 and 15/1 should not exceed 0,25 B at current 20 A. The faulty switch is subject to replacement.

The block (1412.3733 or 25.3761-01) — the electronic device which, depending on the frequency of the impulses arriving from the ignition coil (i.e. depending on the frequency of rotation of the engine), operates the electromagnetic valve 1902.3741. The valve in turn operates the economizer of supply of fuel of idling of the engine.

With a frequency of impulses of system of ignition from 0 to 53±6,36 Hz (that corresponds to 1600±200 ^min.-1 a bent shaft of the engine) and the released pedal of the drive of butterfly valves the control unit gives food on the electromagnetic valve, including the channel of the economizer of idling, and fuel comes to the carburetor.

With a frequency of impulses more than 53±6,36 Hz and the released pedal of the drive of butterfly valves (the movement by a setup) the block stops giving of food on the valve that leads to interruption in supply of fuel via the channel of the economizer of idling in the carburetor.

By consideration of work of system of the economizer of compulsory idling it must be kept in mind that the electronic block works with the microswitch on the carburetor which powers the electromagnetic valve, irrespective of operation of the block when pressing a pedal of the drive of butterfly valves.

An inspection of operability of an electronic control unit needs to be carried out at the K295, K297 stand. In the absence of the stand an indirect indicator of operability of the control unit is giving of tension on the electromagnetic valve at an otpuskaniye of a pedal of butterfly valves and the switched-on ignition switch.

Fig. 9.33. Carburetor microswitch: 1 — the roller lever; 2 — a flat spring; 3 — a roller; 4 — the course limiter; 5 — the case; 6 — the throwing spring; 7 — contacts; 8 — conclusions

The microswitch 422.3709 (fig. 9.33) established on the carburetor gives tension on the electromagnetic valve of the economizer of compulsory idling when pressing a pedal of the drive of butterfly valves.

At the released pedal of the drive of butterfly valves the switch powers off on the electromagnetic valve.

The moment of inclusion shutdown is regulated by movement of the microswitch in oval openings of fastening.

Serviceability of operation of the microswitch is checked by an ohmmeter. Resistance of the closed contacts has to be no more than 0,1 Ohms.

Fig. 9.34. Electromagnetic valve: 1 — the atmospheric union; 2 — the case; 3 — the valve core; 4, 7 — valves; 5 — the union of connection with a carburetor pneumatic valve; 6 — the union of connection with an inlet pipe of the engine; 8 — an anchor; 9 — an electrowinding; 10 — the connecting plug

The electromagnetic valve 1902.3741 (fig. 9.34) serves for management of supply of vacuum in the economizer of compulsory idling. In the absence of power supply on conclusions of the electromagnetic valve the side output tube has to connect to the atmosphere via the filter located between plugs. When giving tension both output tubes have to connect among themselves. Tension of operation of the valve no more than 8 V. Soprotivleniye of a winding of 32 — 43 Ohms. The consumed current no more than 0,4 And.