| 1. Smoothly opening a butterfly valve, to increase the frequency of rotation of a bent shaft of the engine to the value exceeding 1245 min.-1 and to record this situation. |
| 2. To remove the plug from a conclusion of the sensor screw and to connect it to "mass" of the car. At the same time there has to be "a self-oscillatory mode" of operation of the engine which is followed by a pulsation of frequency of its rotation. |
| 3. If it is not possible to cause "the self-oscillatory mode", and the electromagnetic valve has no defect, then the control unit is faulty and needs replacement. |
| 4. An inspection of the control unit can be carried out by direct control of frequency of rotation with which there is an operation of the block, according to indications of a tachometer. For this purpose it is necessary to disconnect the plug from a conclusion of the electromagnetic valve and to connect it to one of conclusions of a control lamp (a low-power electric lamp, 12 V) which second conclusion to connect to "mass" of the car. For ensuring operation of the electromagnetic valve to connect its released conclusion by means of an auxiliary wire to a positive pole of electric network (+ 12B). |
| 5. On the idling mode (850±50 min.-1) to remove the plug from the sensor screw. The control lamp has to burn at the same time. |
| 6. Opening a butterfly valve, to increase the frequency of rotation of a bent shaft approximately up to 1500 min.-1. To connect the plug removed from a sensor screw conclusion to "mass" of the car. The control lamp has to go out at the same time. |
| 7. Smoothly closing a butterfly valve, to reduce the frequency of rotation of a bent shaft. After its falling lower than 1245±5% the min.-1 lamp has to light up. |
