Ignition Coil (check out of curcuit)


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shaver
Posts: 5
Joined: Mon Nov 16, 2009 9:45 pm
Location: Cedar Grove
Motorcycle: 2006 GL1800HP

Ignition Coil (check out of curcuit)

Post by shaver » Sat Sep 15, 2018 5:32 pm



Is there an easy way to check an ignition coil when it's not wired into my 2006 GL1800? I think mine is shorted to ground but when I take it out it's not shorted to the case.



DaveO430
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Re: Ignition Coil (check out of curcuit)

Post by DaveO430 » Sun Sep 16, 2018 10:05 pm

You can ohm check the primary and secondary windings but that won't tell you if it is arcing to ground or not.

Techdude2000
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Location: Lexington, KY
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Re: Ignition Coil (check out of curcuit)

Post by Techdude2000 » Sun Sep 16, 2018 10:11 pm

DaveO430 wrote:
Sun Sep 16, 2018 10:05 pm
You can ohm check the primary and secondary windings but that won't tell you if it is arcing to ground or not.
I haven’t tried it, but I think there’s more to the primary side than just a coil and measuring it won’t help determine it’s condition.

Techdude2000
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Re: Ignition Coil (check out of curcuit)

Post by Techdude2000 » Sun Sep 16, 2018 10:12 pm

shaver wrote:
Sat Sep 15, 2018 5:32 pm
Is there an easy way to check an ignition coil when it's not wired into my 2006 GL1800? I think mine is shorted to ground but when I take it out it's not shorted to the case.
Is it failing to fire at all? What’s the original symptom?

DaveO430
Posts: 925
Joined: Fri Jan 02, 2015 7:28 pm
Location: Amity. Ar
Motorcycle: 2010 GL1800
2004 Suzuki DR200

Re: Ignition Coil (check out of curcuit)

Post by DaveO430 » Mon Sep 17, 2018 6:31 am

Techdude2000 wrote:
Sun Sep 16, 2018 10:11 pm
DaveO430 wrote:
Sun Sep 16, 2018 10:05 pm
You can ohm check the primary and secondary windings but that won't tell you if it is arcing to ground or not.
I haven’t tried it, but I think there’s more to the primary side than just a coil and measuring it won’t help determine it’s condition.
It is just a coil but true, an ohm check won't tell if it's good or not unless it's just an open circuit. The only way to know for sure is try a known good coil.

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GoldWingrGreg
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Re: Ignition Coil (check out of curcuit)

Post by GoldWingrGreg » Mon Sep 17, 2018 8:10 am

shaver wrote:
Sat Sep 15, 2018 5:32 pm
Is there an easy way to check an ignition coil when it's not wired into my 2006 GL1800?
Yes ... but it takes a coil tester like the old Sun scopes of the 70s had.

Techdude2000
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Re: Ignition Coil (check out of curcuit)

Post by Techdude2000 » Mon Sep 17, 2018 8:23 am

It’s more than just a coil, it’s digitally controlled with only 2-5 volts from the ECM for the trigger pulse. There’s probably an SCR inside of it for triggering. Using the green ground wire for reference, if there’s good battery power on the black/yellow wire and you can measure pulsing 2-5V on the yellow/white wire when you crank the engine, then the coil should be firing. If it’s not or is intermittent, replace it.

If you suspect it’s bad, then swap it with another one on the same bike and see if the miss moves with the coil. If it does, then the coil is bad. If it’s doesnt, then verify the signals already mentioned. These coils are pretty tough, but they do fail on occasion.

shaver
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Joined: Mon Nov 16, 2009 9:45 pm
Location: Cedar Grove
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Re: Ignition Coil (check out of curcuit)

Post by shaver » Mon Sep 17, 2018 8:46 am

First checked from 5 then 6 to ground and had very low resistance. pulled the fairing apart in the front and unplugged the wires from coil secondary and found short from output to gnd. Unplugged 3 wire plug from primary. Chked from secondary to gnd and found it's now open. Secondary to pin that connects to green gnd - Short. Next, compare all three coils.

Techdude2000
Posts: 132
Joined: Mon Jun 13, 2011 10:11 pm
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Re: Ignition Coil (check out of curcuit)

Post by Techdude2000 » Mon Sep 17, 2018 6:41 pm

shaver wrote:
Mon Sep 17, 2018 8:46 am
First checked from 5 then 6 to ground and had very low resistance. pulled the fairing apart in the front and unplugged the wires from coil secondary and found short from output to gnd. Unplugged 3 wire plug from primary. Chked from secondary to gnd and found it's now open. Secondary to pin that connects to green gnd - Short. Next, compare all three coils.
The plug wires should not measure shorted to the green ground wire with them connected to the plugs or disconnected from the plugs. That sounds like a bad coil. This is a wasted spark system, meaning both plugs fire together, one on the firing cycle and the other on the exhaust cycle. Both outputs float above ground.



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