Automotive Weekly Waveform 11 - How Smart Ignition coils work and scope captures
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- Опубликовано: 16 авг 2024
- Automotive weekly waveform #11 will guide you through the process of scoping smart ignition coils. Smart ignition coil typically have the transistor as well as other electronics built into the coil.
WARNING!!! We are working with voltages up to 40,000 volts. Use caution for your safety and the safety of your scope. NEVER connect scope directly to the secondary ignition cables or the coil output.
For this test we will need a COP wand, a HT extension lead or a coin to get a secondary waveform. If using a coil simply put your scope into a 1 or 2 volt scale and touch your scope lead to a coin placed on top of the ignition coil. Some coils are heavily shielded and will require the coil to be removed and a HT extension lead placed between the coil and the spark plug.
For scoping the logic level signal from the PCM to the coil we just need a standard scope lead. This signal is normally just a square wave between 0-5 volts or 0-12 volts. the IGT signal was 0-4 volts on this 2007 Toyota Highlander Hybrid.
You cannot scope the Primary voltage but you can scope the primary amperage by placing a low amp clamp around the power feed to the coils.
My toyota also had a feedback signal to the computer known as IGF. This wire is interconnected between all coils and get pulled to ground when each coil wants to let the PCM know that it received the IGT signal and is charging up.
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affiliate link used below help support the channel at no addition cost to you. Thank you
Hantek HT308 COP Extension Cord with Earth Cord - amzn.to/3nEXfUk
60 amp PDI low amp clamp with banana plugs- amzn.to/3qznAW0
Cheaper hantek low amp clamp(I have never used this clamp) - amzn.to/2JwUC8x
20:1 attenuator - amzn.to/2JSicwl
10:1 attenuator for uscope - www.aeswave.co...
back probing set - amzn.to/3587E46
secondary ignition pickup(we will need this shortly) - amzn.to/35bxlkm 
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Great video and explanation! Now I can’t wait until my next misfire comes in so I can put these skills to the test! Thanks!!
When fiddling with these i thought I was doing something wrong, my secondary wire patterns were much harder to quantify in the way as old style systems. So it is reassuring to see you encounter the same issues. Thanks for going through this series, it clarified many issues for me.
Thank you Chad and Val. Good job. Have a blessed and safe week to you and your family. Merry Christmas.
Thank you Billy, We hope you and your family have a blessed holiday as well.
I use a General Technologies Corp. GTC-505 with great results. I rarely see it in videos. Thank you for sharing.
Your right, I have only seen a few videos on it as well. It looks like a great tool.
Best video ever on this topic
I MUST GO OVER THIS ONE AGAIN, THIS ONE IS A LITTLE HARDER TO RAP MY HEAD AROUND THEN THE REST OF THEM . BUT IT GOES TO SHOW WE ARE DEFINITELY LEARNING AS YOU GO. PLEASE KEEP UP THIS GREAT WORK CAN'T SAY ENOUGH GOOD THINGS ABOUT YOU AND THIS VIDEO SERIES !!!!!!!!!!!!!!!!
Let me know if you run into any trouble or if you want me to cover the electrical portion in more detail.
Excellent presentation !
well done. thanks for sharing your knowledge. looking forward for your next video.
Thanks for watching!
Thanks a lot for this video! Was very helpful and was exactly what I was looking for.
Great video, I like the illustration. I missed week 10 but I still intend to do it at some point. This video definitely helps with the explanation of secondary vs primary and the difference between COP's and old school. Thanks again man, appreciate ya taking the time to do this video set. I was gonna ask where you got that extension cord but you linked it, gonna get me one by the end of the week hopefully.
Great video not alot to see as far as other coils.
Great video Chad, I like to re inforce knowledge.
Thank you Maic. Have a great holiday.
snapon COP -11 works good on capturing waveforms especially on the heavily insulated coils. It has some kind of amplifier built in or something?
GREAT VIDEO!!!
I actually need to have a signal that indicates when the spark is fired (or actually present) for a special project. I must use the wires already on the COP. I am able to trigger my circuit on the rising or falling edge of IGT or IGF...any suggestions??
I will be ready to try it in a few days.
BTW: Have you ever 'scoped' a logic signal that was actually 12v logic instead of 5v??
THANKS MUCH!!!
Hi Chad. Can you show us Toyota ignition coil that prevents the vehicle from starting even though we have IGF signal when cranking. I have found that we also have IGT signal but vehicle starts & dies, I have found the ignitions coils put high amperage during cranking & prevents vehicle from starting. I know if we have shorted ignition coil it will make the 5v from igf to go down to zero volts but i have seen shorted coils & still have good IGT & IGF signals.Can you show us some waveforms with no starting situation? Thank yoiu
Hi, great videos and thank you for all your hard work, however the Facebook group I can’t seem to find it with the link shared down below as you mention.
We have closed the group for now but may reopen the group after the new year and if we are lucky we will have a season 2 of the automotive weekly waveform.
thank u sir👍
Most welcome
Still want to do distributor but might take awhile since all we get is newer cars😆
I feel like distributor waveform offer the ease of access required while learning the waveforms. Makes it easier to create your own problems so you can see the effect on the scope