Ignition Coil Testing

Explains the Ignition Coil Operation. The ignition coil's job is to increase the voltage from 12.6v to 8K to 45K volts. In essence it is an auto transformer. Voltage is increased but current is decreased. All ignition coils need a pulsating DC to function. Learn how it operates and how to test. Further information can be found at our website and Feed-Blog. You may subscribe for free.

Category:

Autos & Vehicles

Tags:

• automotive
• automotive technology
• ignition coil
• sensor
• diagnostics
• electrical
• ignition system
• coil
• mandy concepcion
• bobina de encendido
• ignition
• DIS
• COP
• p0350
• p0351
• p0352
• P0353
• P0354
• P0355
• P0356
• P0357
• P0358
• P0359
• P0360
• P0361
• P0362
• P0363
• P0300
• P0301
• P0302
• P0303
• P0304
• P0305
• P0306
• P0307
• P0308
• car
• cars
• engine
• coil ignition
• coil - ignition

[8btz]

hi there great videos btw. i have a question. i just removed the coil from my 99 accent and tested it with a multimeter and both the primary resistance and secondary resistance for both coil packs(1 and 4, 3 and 2) were fine. i then went back to check it again the next day as it had been sitting on the kitchen table and now i'm getting absolutely no reading for the secondary resistance on either coil pack! the primary resistance is still within spec, but a few decimal places higher now. thanks!

[ADPTraining]

@8btz I don't about "a few decimal places", but remember that resistance changes with temperature. The change is a few Ohms, but not a few decimal places. Also, often times, on a bad coil, once the coil cools down it's back to normal, but fails at higher temperatures. Good luck.

[8btz]

@ADPTraining thanks! i should mention that the coil was sitting on the table for a day before i first checked it, and the readings were 1.1 ohm primary resistance and 14.2 kohm secondary resistance on both coils. now the primary resistance is at about 1.5 ohm and there is no reading or response whatsoever when i test the coils. how could they have both read 14.2 a day ago and now no matter what i do there is no response. this is using two brand new multimeters because i exchanged them

[ADPTraining]

@8btz You have a loose connection. (intermittent). 

[twistedyogert]

I thought that the coil was located on the outside of the engine near the distributor. But i noticed that the distributor sends electrical charges to a coil attached to each spark plug. I guess the old way mend that if your coil gave out you wernt going anyware

[ADPTraining]

@twistedyogert Newer systems use COP or coil on plug. The igniter can be either at the coil itself or a separate unit. No Dist. is used on these systems. The ECM and crank sensor is all that's needed. Good luck...

[ferratilis]

"A fault at either of this two circuits will create a misfire."

[techdavey1000]

Oh nice one! I worked in a government department once and there were a lot of ex military types. One bloke had been in a special unit and part of their training was how to steal cars! (very handy when you are behind enemy lines) On one brand the doors could be opened by giving the rear bumper a karate kick! (the car thought it had been in a crash so it opened all the doors!) That was a LONG time ago and they won't be that easy now. Re ignition, main problem is carbon string leads, bin @ 2yrs

[kamphwagon1]

@techdavey1000 LOL so far I haven't had to deal with any of the Eueropean stuff , some of these American systems are bad enough,esp ford motor co , I have a freind who owns both a MKZ and a Ranger whom had keys for both on the same key ring ,when he accidently stuck the Ranger key in the MKZ, of course it wouldn't start ,but it wouldn't start with the proper key either..Anti theift device that will often reset if the car is raised up by the frount end like a wrecker does odd eh...

[techdavey1000]

@kamphwagon1 European systems especially the ones made by Valeo can be a bit confusing at times. The reason is they can arm themselves when the car is parked! Even if the key has been left in the ignition when it is turned the car won't start! The solution is to press "lock" and "unlock" on the remote key fob. I have never proved it but I feel sure that the locking system also fully locks the tailgate after a while as if you just leave it "not slammed" half an hour later it will be locked!

[8btz]

many thanks. i just ordered a new coil from ebay, fingers crossed!

[kamphwagon1]

@ADPTraining Theres another thing to watch for on those chiped digital keys, esp if women are in the mix is contamination on the key, seems like some of these womens hand lotions will prevent proper chip detection , sounds stupid but just wipeing the key off with a clean cotton rag will fix the problem, on a lincion you may have to disconect the battery and wait for everything to reset ,some have anti theft systems that get even, depending on the year, tricker to reset .