9.1.15. Control system of the electromagnetic valve of the carburetor

Check of the control unit

Fig. 9.39. Scheme of connections of a plait of wires of contactless system of ignition: 1 – spark plugs; 2 – ignition sensor distributor; 3 – ignition coil; 4 – switchboard; 5 – control unit of the electromagnetic valve of the carburetor; 6 – electromagnetic valve of the carburetor; 7 – trailer switch of the carburetor; 8 – ignition switch; 9 – assembly block; 10 – speed sensor; 11 – engine cooling system fan electric motor; 12 – sensor of turning on of the electric motor of the fan; And — blocks for connection with a forward plait of wires; B — the scheme of conditional numbering of plugs in blocks of the sensor distributor of ignition and the sensor of speed; In — to power supplies; — to a combination of devices (a signal for a tachometer); Е — to a combination of devices (a signal for a speedometer)

The serviceable block 5 (see fig. 9.39) managements has to switch-off the valve 6 at increase in frequency of rotation of a bent shaft up to 2100 min.-1 and turn on the valve at decrease in frequency of rotation up to 1900 min.-1 if the trailer switch of the carburetor is closed on "weight".
Before check of operability of the block be convinced of correctness of connection of wires to it (see fig. 9.39).
Operability of the control unit is checked by means of the voltmeter (with limits of measurement of 0-15 V) in the following order:
– disconnect a green wire from the trailer switch of the carburetor and connect a tip of this wire to "weight";

Fig. 9.49. Scheme of check of the control unit: 1 – control unit; 2 – the transitional socket with the voltmeter; And — to a plait of wires of the car

– connect to the control unit the voltmeter by means of the special transitional socket 2 (fig. 9.49);
– start the engine and, gradually increasing rotation frequency, you monitor indications of the voltmeter: after start of the engine the voltmeter has to show voltage not less than 10 V, and at the time of shutdown of the valve — spasmodic undervoltage up to the size no more than 0,5 V;
– after shutdown of the valve gradually reduce rotation frequency to turning on of the valve: the voltmeter has to show at the same time spasmodic increase in tension not less, than to 10 V;
– establish the frequency of rotation of a bent shaft within 2200–2300 min.-1, disconnect a tip of the wire going to the trailer switch of the carburetor from weight and then again connect it to weight; at a wire detachment from "weight" the valve has to turn on, and at connection with "weight" — to be disconnected.

       NOTE
It is allowed to check the block without voltmeter on characteristic knock of the valve at shutdown and inclusion.