Ignition coils are designed to generate high voltage electric current to ignite the working mixture in the engine cylinders
Ignition coils (2 pcs.) are mounted on top of the engine.
The ignition coil arrangement is shown in the figure.
The ignition coil is a transformer.
The primary winding 5 is wound on the magnetic circuit 1, and the secondary winding 3 is wound on top of it in sections.
The windings are enclosed in a plastic case 2.
The space between the windings is filled with compound 7.
There are low and high voltage terminals on the case 6.
Low-voltage electrical impulses are supplied to the ignition coil from the control unit.
In the ignition coil, they are transformed into high voltage electrical impulses, which are transmitted through wires to the candles.
Electric discharge occurs simultaneously in two candles of the first and fourth cylinders or the second and third cylinders.
For example, one electrical discharge occurs in the candle of the first cylinder when the compression stroke ends there; the second discharge occurs in the candle of the fourth cylinder when the exhaust stroke occurs there.
Electrical discharge in the spark plug of the fourth cylinder during the exhaust stroke does not affect the operation of the engine.
With further rotation of the crankshaft, an electrical discharge will occur in the candle of the fourth cylinder.
If oil gets on the wires, they should be wiped with a rag soaked in gasoline.
If necessary, check the condition of the current-carrying core of the wire with an ohmmeter.
The resistance of the wires to the 1st and 2nd cylinders should be no more than 1000 Ohms, and the wires to the 3rd and 4th cylinders - no more than 900 Ohms.
Remove the spool
Disconnect the wire from the "negative" terminal of the battery.
Disconnect 4 blocks 1 of low-voltage wires and high-voltage wires 5 from the coil.
Remove bolts 2, remove bar 3 and coil 4.
Remove the second coil in the same way.
Checking the coil
Coils 30.3705 and 301.3705 are checked by a spark plug diagnostician 1AP975000 on a car.
To do this, disconnect the high-voltage wires from the coil and connect the diagnostician instead.
Then crank the engine with a starter, while a spark should jump in the diagnostic spark gap in time with the operation of the cylinders.
We connect an ohmmeter to the terminals of the primary winding of the coil and measure its resistance.
For a working coil, the resistance of the primary winding should be in the range of 0.4-0.5 Ohm.
To get the exact measurement value, by shorting the probes of the voltmeter, we measure the resistance of the device wires.
We connect an ohmmeter to the high-voltage terminals and measure the resistance of the secondary winding of the coil
For a serviceable coil, the resistance of the secondary winding should be in the range of 5-7 kOhm.
If the measured parameters differ from those indicated, the coil must be replaced.