Execution order
1. Disconnect the block connector (1). Turn on the ignition and measure the voltage between contacts "2" and "4". The voltage should be approximately 12 V (battery voltage). Otherwise, you need to find and fix the break in the wiring (2 - switch).
2. Turn off the ignition and connect the connector to the switch.
3. Disconnect the connector from the ignition distributor.
4. Connect a voltmeter to terminals 6 and 4 of the ignition coil. Turn on the ignition and measure the voltage. It should be at least 2 V and should drop to zero after 1–2 seconds. If this does not happen, the commutator must be replaced.
5. Connect the central contact of block 18 to the ground with a wire. The voltage should increase to 2 V for 4-cylinder engines and to 5–6 V for 5-cylinder engines. Otherwise, replace the switch.
6. Turn off the ignition. Connect a voltmeter to the outer contacts of connector 18. Turn on the ignition and measure the voltage. It should be 5 V. If the voltage differs from the specified value, check the wiring.