Carburetor Solenoid Valve Control System

Serviceable block 3 (pic. 9-26) control should turn off valve 2 when the crankshaft speed increases to 2100 min^-1 and turn on the valve when the speed drops to 1900 min^-1, if the carburetor limit switch is shorted to ground.



Before checking the operation of the unit, make sure that the wires are connected to it correctly (see fig. 9-26).

The operation of the control unit is checked using a voltmeter (with measurement limits 0-15 V) in the following order:

• disconnect the green wire from the carburetor limit switch and connect the tip of this wire to ground;
• connect a voltmeter to the control unit using a special connector 2 (pic. 9-27);
• start the engine and, gradually increasing the speed, monitor the voltmeter readings: after starting the engine, the voltmeter should show a voltage of at least 10 V, and at the moment the valve is turned off, an abrupt decrease in voltage to a value of no more than 0.5 V;
• after turning off the valve, gradually reduce the speed until the valve is turned on; the voltmeter should show an abrupt increase in voltage to at least 10 V;
• set the crankshaft speed within 2200-2300 min^-1, disconnect from the mass the tip of the wire going to the limit switch of the carburetor, and then reconnect it to the mass; when the wire is disconnected from ground, the valve should turn on, and when connected to ground, it should turn off.

It is allowed to check the operability of the control unit without a voltmeter and adapter by the characteristic click of the valve when turning it off and on.