Connect a voltmeter to the battery terminals.
Turn on the ignition, while there should be a voltage of about 12 V. Otherwise, the battery is discharged.
Pull out terminal 4 wire (central) from the middle of the distributor cap and put against the mass. Switch off the starter and measure» voltage. Control value - about; 10 V.
Transistor ignition system with added resistance
Check the input voltage at the additional resistance. To do this, connect a voltmeter to the black / red wire at an additional resistance of 0.4 ohms and to ground. The control value is 12 V. Then turn on the starter, the voltage should then reach 8.5 V.
Connect a voltmeter to terminal 15 of the ignition coil and to ground. Reference value 4.5 V.
Connect a voltmeter to terminal 1 of the ignition coil and to ground. The control value is from 0.5 to 2 V. If the measured value is a large value, then the switch is defective; If the control value is reached, and there is no ignition spark, then you need to check the sensor in the distributor or the secondary winding of the ignition coil. Check the additional resistance with an ohmmeter. To do this, disconnect the corresponding wire from the resistance and connect the measuring device to the resistance contacts. Reference values: approx. 0.4
Attention: The values are valid for a temperature of approx. 20°, as the temperature rises, the resistance increases.
Check ignition coil resistance.
The primary resistance, measured between terminals 15 and 1, should be between 0.33 and 0.46 ohms. The resistance of the secondary winding, measured between terminals 1 and 4, must have a value of 7 to 12 kΩ.
Check the angle of the closed state.
As already mentioned, adjustment of the angle of the closed state is not possible. The check serves only to check the operation of the switch. If the control value is not reached when measuring the angle of the closed state, then the sensor of the ignition distributor should be checked next. If it is OK, then you need to replace the switch.
Checking the ignition distributor sensor. Disconnect the ignition distributor control wire from the switch, connect an ohmmeter between terminal 7 and 31d and check the resistance of the sensor. The value should be 600±100 ohms. With a cold engine, the resistance value should lie in the lower half, and with a warm one, in the upper half of the range of permissible values.
Check the sensor coil for a short to ground. To do this, connect an ohmmeter to terminal 7 and ground. The ohmmeter should show infinity. In addition, check the sensor for mechanical damage. There must be an air gap between the rotor and the stator. If the sensor turned out to be defective, then you will have to replace the ignition distributor completely.