Ignition Coil: the device and methods of diagnosis

Appointment ignition coil

ignition coil - this is one of the most important elements of the ignition of the fuel in the engine cylinders.It is a device that consumes low voltage current from the car battery and converts it into high voltage pulses.They form at the right moment the spark between the electrodes of the spark plug and ignite the fuel-air mixture.Ignition coil


ignition coil device is similar to a transformer; it also has two windings (primary and secondary) at the core, and a special device converts the DC battery into a pulse whose voltage rises several thousand times on the law of electromagneticinduction.The ignition system of the old car had only one such unit.Pulses from him in turn fed to all the candles through the distributor and high-voltage wires.But lately, the machines are increasingly common system with the removal of a single coil per cylinder.

fault diagnosis by candles on the case

Without this device the vehicle is not able to start.Therefore, check the ignition co

il - this is the operation that should be able to make any motorist.The most common way - is to unscrew the spark plug from the cylinder and close them on the motor housing with the subsequent attempt to start the car.If the spark jumps between the electrodes, then the ignition coil is working.If not, it is likely a problem in this device.But many motorists there is a perception that this type of test coil may damage.

diagnosis by measuring the resistance

check ignition coil

There is a safe alternative, but in this case you will need an ohmmeter.The method consists in measuring the resistance of the windings.The exact values ​​are specified in technical handbooks, but typically a work coil has a primary winding resistance of 16-17 ohms.If found strong disagreement with this figure or even rupture (infinite resistance) or short circuit (the value will tend to zero), it is likely this unit is faulty.

Alternative methods of diagnosis

Another way - is to set your reel to another machine.In this case, you will definitely know whether the defective component.The difficulty is that the car must be of the same brand and the same configuration as your, and still you need the consent of the owner.Also, there are visual signs of failure of the coil: the smell of burning insulation or signs of breakdown (the presence of burnt black points on the body and windings).

it possible to repair the ignition coil

What to do if you have installed a fault of this component of the ignition system?Only change - the coil can not be repaired.More precisely, it can be repaired, but the complexity of the replacement coils makes such an operation unprofitable.The device of the ignition coil

methodology of work

Remember safety for all manipulations with the ignition system, since the voltage of the coil may reach 20-25 thousand volts.Use tools with electrically insulated handles and do not use in damp areas or in the rain.If you can not find the cause of the fault of the car yourself, contact an authorized service.Good luck on the road!