Home coil tester

Hello, in this opportunity I show you how to test a coil without drying without integrated power circuit. And I do it thanks to a rudimentary little tester.

To test the DIS ignition coils (without distributor) you must have a little bit of expertise and rely as much as possible on the electrical diagrams of the vehicle to which the coil belongs.

Before explaining the connection mode, it will be explained in a general way how these modules work.

types of DIS cart coils

tipos de bobinas carro DIS

In the previous image you can see two basic diagrams of the DIS system, the upper part shows the system with power integrated to the coil and in the lower one the system with power in the computer.

Now, you may wonder how is this integrated power ... Well it is simple, for the coil to induce high voltage on the secondary, it needs two things. The first is that a large amount of current flows in the primary and secondly signal oscillation. Then to achieve the current of the current a transistor of high energy (not a platinum as it was done before) that is activated by the signal STE of the computer is used. Then depending on the manufacturer, they mount this power circuit on the coil or on the computer.

Having said the above, we can talk a little about how it works, and that is that at the appropriate time during the compression stroke in the cylinder, the PCM activates the signal called STE to the coil module that will activate the transistor inside the module, which in turn will cause electric current to circulate through the primary coil of the ignition coil, charging it. At the optimum time for the ignition to occur, the PCM will deactivate the STE signal and there, the transistor will cut the current flow through the primary winding (the cut mode of the flow also depends on the manufacturer). The magnetic field created collapses and induces a high instantaneous voltage in order to maintain the induced electric current, it will travel by means of the cable of the secondary coil and from there by the spark plug cable until it reaches the spark plug, which will burn the fuel and finally, it will touch earth.

So how do we identify the type of coil we have?

Well it's quite simple, with the help of a multimeter that measures resistance what we do is to test between two pins in search of which gives us resistance or continuity.

So as a general rule and as you can see in the first image when measuring a coil with integrated power, we will measure the semiconductor junction that will be infinite. When we do not have power integrated in the coil, we will measure the resistance of the low voltage winding.

How to know if our coil is in good condition or not?

For coils without integrated power

These coils it is possible to test the high winding and the low winding and have a clear idea if it is in good condition or not.

diagrama de bobina carro

As you can see in the previous image, with our Chery A3 coil, the electrical diagram is below. So if we measure the terminals with a tester as indicated in the table, we have to:



1 y 3

0,8 ohms a 1,4 ohms

1 y 4

0,8 ohms a 1,4 ohms

A1 y A2

8 kohms y 12 k ohms

A3 y A4

8 kohms y 12 k ohms


If our measurements are within that range, we can ensure that our coil is in good condition.

As I mentioned at the beginning of the article, identifying the internal connections of the coil requires skill and knowledge of the mechanic.

For example, in our Chery coil we have terminals 1 and 2 are oneself. This would be evident in our multimeter as a resistance of zero or much lower than those of the other pins. Even measuring terminals 3 and 4 with the multimeter will give us twice as much resistance as 1 and 3 or 1 and 4. Because we have a serial connection of primary windings.

The same for high voltage coils, we must use the order of ignition, numbering of the coil or visually it is possible to identify them.

For coils with integrated power

It is only possible to test the high voltage winding and it is done in the same way as the previous one explained.

How is the coil functioning tested?

For coils with integrated power

Testing a DIS coil is simple, it is not even necessary to use any type of device to make the coil as in the old coils that needed the combination of a capacitor to increase the breakdown speed of the electromagnetic field, but rather the care is to know the function of the pins of the same to connect it correctly without damaging it.


It is recommended that before taking the tests, remove the coil from the vehicle, this is because if for some reason a spark jumps to a control cable that comes from the computer, it will irreparably damage it.

Now, the test procedure consists of the following:

diagrama bobina dis

In the previous figure, the circuit that must be mounted to test a 4 terminal coil typical of the Corsican chevrolet is shown. As you will see, it is simple with a tip connected to the negative terminal of the battery if you touch terminal S1 for 2 seconds and then move it away to jump the spark in core 1. The same will happen if you do it with point S2, except that in this case the spark will be seen in the core 2.

Important note

You must always connect spark plugs to the wires and they must be well grounded so that the current coming out of high voltage winding is properly discharged to ground. With this we guarantee that sparks do not jump between the internal windings of the coil which degrades quickly.


For coils without integrated power system

For these coils we must assemble a small rudimentary tester.

Materials we need:

A polyester condenser of 1 uF and 400 V

A 12V power source and at least 5A

A resistance of 38 ohms.

Test diagram

diagrama probador de bobinas dis

As you can see in the previous image, it is quite simple to put together. It only consists in connecting a low winding terminal to positive and assigning the negative terminal with a pushbutton or switch. Do not forget to place our polyester condenser in parallel. Beware, do not place an electrolytic capacitor on the circuit since it can not handle reverse voltage which causes it to overheat to such an extent that it explodes.

The resistance of 38 ohms is to terrify the other winding so that the current flows to our spark plug. If we do not connect it, the induced current can not circulate, which means that the spark does not jump or lower the intensity due to the losses.

How does our circuit work?

Well as I said at the beginning of the article, our coil needs current to circulate and oscillate so that the primary induces voltage to the secondary. We achieve this with the capacitor. Then when we close the switch the coil is charged with energy and when we open the suiche the current stored in the coil charges the capacitor then when the capacitor is charged it is discharged towards the coil in a swing of energy at high frequency (electrical resonance ). It is because of this phenomenon that we achieve the spark in our spark plug. If we remove the condenser, we will not make a spark.

Finally to finish testing our coil, we change everything to the second high coil as indicated in the following image:

diagama probador de bobina dis

Well it's all for the moment, and I hope you like it. Any questions or comments, leave it below in the question section.

Here is a video of how I did it:

If you like them, you can vote up at the beginning of opinions and give me 5 stars. jejejeje. Bye, bye

Questions or suggestions

In the box below questions.

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Written by:

Dennis García




Gracias por compartir tus conocimientos a personas aficionadas a la electrónica y que desean aprender mas de este mundo.


Muchas Gracias

Muchas Gracias Chica Mecánica.

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Home coil tester

Home coil tester

Hello, in this opportunity I show you how to test a coil without drying without integrated power circuit. And I do it thanks to a rudimentary little tester.

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17 Question(s) answered

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  • Asked by J Luis
    on 11/07/2017
    Hola quiciera saber su me puedes hacer un probador y cuanto me costaría gracias por tu atención Answer:
    Hola J Luis te estare enviando la informacion solicitada a tu correo jluismh_1@hotmail.com, saludos
  • Asked by victor vega
    on 11/15/2017
    Las bobinas con transistor de potencia se suichean a + o a - ?.Gracias chica mecanica Answer:
    Hola Victor, se activan con voltaje negativo y con voltaje positivo se apaga.
  • Asked by Jorge mejia
    on 11/22/2017
    Para las bobinas de dos pines como la de Renault Simbol, megane, etc... Sirve este mismo circuito... Gracias chica mecánica, sus videos han Sido de mucha utilidad. Answer:
    Gracias Jorge! ya lo voy a agregar al articulo. jejeje.
    on 12/31/2017
    Hola. La verdad tus diseños y videos son de una utilidad extraordinaria. Tengo una pregunta: como obtengo el aterramiento de la resitencia y la bobina? Trabajo en un mesón de madera. Muchas gracias Answer:
    Que tal Virgilio, bueno la tierra que hablo en el artículo es el borne negativo de la batería. ; ) El chasis de metal de la bujía debe estar bien conectado al negativo de la bobina.
    on 12/31/2017
    Hola de nuevo. Donde vivo (un pequeño pueblo en argentina) no se encuentran componentes electrónicos por lo que recurro a cualquier equipo dañado que llegua a mis manos. Tengo un condensador de poliester de 1 uF pero de 250 volt. Podría servirme? Gracias de nuevo Answer:
    Hola Virgilio, es un poco grande para el diseño pero si podría funcionar... solo debes hacer que los pulsos sean mas largos en duración para que el condensador se cargue bien.
  • Asked by Pedro Soucre
    on 01/05/2018
    Buenos días, Chica Mecánica necesito saber el orden de los cables del conector de la bobina de un chery Arauca, tengo 3 cables, uno azul con marrón y los otros dos amarillo. Me robaron la bobina y arrancaron bruscamente el conector dejando los cables descubiertos.. Gracias. Answer:
    Hola Pedro, que broma lo del robo. Bueno El amarillo con una franja blanca va al pin 1, el otro amarillo solido va al pin 2 y el faltante va al pin 3. de la bobina. el pin 1 colocando la salida de bujias hacia arriba el pin mas a la izquierda. Saludos.
  • Asked by Pedro soucre
    on 01/05/2018
    Ok, ya estoy claro con los colores... Pero tengo dudas de cual es el pin 1 Lo presente y le tome una foto, por que via se lo puedo enviar para que por favor mire a ver si lo coloque correcto... Se lo agradecería muchísimo.. Answer:
    Te estoy contestando por Instagram.
  • Asked by virgilio gonzalez
    on 01/07/2018
    TE pido disculpas. YA me habias rspondido solo que no fuí notificado por mail. Sin embargo insisto jajajaja. Si el aterramiento puede ser al negativo de la bateria, para que uso la fuente de poder si puedo usar la batería? gracias de nuevo y continúa con tud exitos Answer:
    Hola, puedes usar la bateria del automovil para este experimento. Yo mis diseños los hago en casa y para mi no es practico sacar la bateria super pesada del carro para hacer estos inventos. jajajaja.
  • Asked by Jossel
    on 01/18/2018
    Hola chica, Primero Que nada Felicidades por compartir ese gran conocimiento al publico, muy generoso de tu parte, y toda siembra tendrá su cosecha. mi pregunta es la siguiente: Tengo un renault 11 al cual hoy se le daño el condensador de la bobina,mi bobina es identica a esta de la imagen de aqui: https://static.mercadoshops.com/modulo-de-encendido-con-bobina-renault-11-gala-21-carburado_iZ47825508XvZgrandeXpZ2XfZ125653471-445442754-2XsZ125653471xIM.jpg ....... lo azul es el condensador que se me daño, dejo de hacer contacto, y un amigo lo desarmo y se daño pues jeje... queria saber si le podria colocar uno de este tipo como el de esta imagen: http://www.fierrosclasicos.com/wp-content/uploads/2015/03/12.jpg Gracias de antemano y porfa si me podrias responder al correo. trabajo con software de celulares y nos podríamos ayudar mutuamente jejeje Besos Answer:
    Que tal Jossel, ¿ese condensador es el antiparasitario no? En efecto si es asi, puedes colocar el que me indicas en la otra imagen, solo tienes que estar seguro de que este en el rango entre 0,5uF y 5uF par que sea efectivo y atrape las corrientes parasitas.
  • Asked by jossel
    on 01/18/2018
    Gracias por tu pronta respuesta amiga. en realidad no sabría decir si es el que me dices. se me olvido colocarte que después de eso la bobina dejo de enviar la chispa, le podre colocar uno del tipo que usas en la prueba? claro siempre y cuando encuentre uno del rango que me especificas. Answer:
    Jossel, no debió afectar el funcionamiento de la bobina la perdida de este condensador ya que solo cumple la función de evitar la alta frecuencia que perturba el radio y otros componentes electronicos del vehículo. ¿Le pusiste encendido electronico al renault?
  • Asked by alberto
    on 03/10/2018
    Hola buenos dias srita. con respeto me dirijo a ud, para una consulta, le comento que quiero colocar una bobina seca de pointer 1.8L a un pickup nissan carburado, no lleva enc. electronico de fabrica salio a platinos. le adapte un modulo de chevette y de esta forma lo hice enc. electronico, de que forma coloco esta bobina o en su defecto que necesito agregar a la bobina, ya que me dicen que la bobina es de +-1.0 ohms y el circuito con el que trabaja el modulo funciona mejor a partir de 2.2 ohms. Le coloque una resistencia automotriz al + del swich y de ahi a la bobina, no se si hice algo mal queme el modulo :) . Un saludo y gracias. Answer:
    Que tal Alberto, el encendido electrónico del chevette vino diseñado para bobinas en aceite que tienen una impedancia más alta y voltaje inverso más bajo que las bobinas secas actuales. Esto genera problemas para el transistor de potencia del módulo. Si me envias un email a intarce@gmail.com o intarce@hotmail.com con un diagrama de lo que hiciste podría ayudarte mejor.
  • Asked by gibran
    on 03/26/2018
    hol amiga soi nuvo en la mecanica me gustaria sacarme algunas dudas algunas veses nose si tiens un grupo de watsapp . silo tienes me agregas porfa +5978912334 y si no tienes ases uno y me agregas sik puedes porfa ai te dejo mi numero gracias Answer:
    Que tal Gibran, no tengo grupo de WhatsApp por instagram me puedes escribir sin problemas. ; )
  • Asked by alberto
    on 04/08/2018
    Hola de nuevo por aca. Le envie hace un tiempo ya los diagramas de como conecte el modulo de encendido electronico a su correo hotmail, espero no le sea molesto que pregunte si lo que le envie le sea a ud claro o tenga alguna inconsistencia y me lo haga saber, entiendo que su tiempo es valioso, asi como su trabajo. Un saludo y gracias. Answer:
    Alberto, no he recibido correo con diagrama....reenvialo al correo contacto@intarcesoft.com.ve con gusto lo reviso y te comento.
  • Asked by gotico
    on 07/03/2018
    si las bobinas de twingo son aptas para esa prueba Answer:
    Claro gotico. Pero debes tener el pinado para saber cual es el común positivo si no tienes un tester.
  • Asked by Francisco
    on 07/08/2018
    Saludos. Recién estoy investigando como funcionan estos sistemas, en particular porque tengo una falla y quisiera probar la bobina de mi carro, es un fiat Tempra 1.6 del 98 de con carburador, ¿De casualidad conoce esa bobina? ¿Este probador serviría para esta bobina? Gracias de antemano. Answer:
    Hola Francisco. Si funciona para ese tipo de bobinas sin problemas ; )
  • Asked by a guest
    on 07/11/2018
    un probador igual pero para censores de cigüeñal Answer:
    Ya lo tengo amigo, busca el articulo de probador de ckp.
  • Asked by Angello Hernández
    on 09/09/2018
    Excelente artículo Answer:
    Muchas gracias Angello ; )

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