Not getting a Pulsed 12V to the top of my ignition?

ERIC MILLER4

MEMBER
2006 KIA SEDONA
3.8L
6 CYL
2WD
AUTOMATIC
170,000 MILES

Love your article on the ignition system test. It failed on step 12. I am not getting 12V pulse out of any of the three leads. I also used a NOID tester. No flashing lights. I can get 12V CV (constant voltage) on one side (lead) if the other is on the (-) on each terminal.

I pulled the CKP. Ohm is ~ 700ohms in one polarity, open in the other. It does respond when I put it close to a metal. So, I believe the sensor itself is good, why am I not getting a Pulsed 12V to the top of my ignition?

Sunday, October 16th, 2022 AT 11:48 AM

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

There is an ign coil fuse that needs to be checked for 12 volts. Here is a guide to help and the fuse location in the images below:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

You might have a shorted coil causing the fuse to blow. Check out the images (below). Please let us know what you find.

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Monday, October 17th, 2022 AT 9:31 AM

ERIC MILLER4

MEMBER
2 POSTS

I have checked every single fuse (both in the car and under the hood) = all good. I replaced the ECM. Still no spark, no light with my NOID tester. I replaced all the spark plugs and checked all the wire connections. I am at a loss here.

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Sunday, October 23rd, 2022 AT 2:43 PM

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

Even though the crankshaft sensor seems to respond it still can be bad. Let's start by running the codes, also unplug the MAF sensor and try to start it.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

When this sensor goes bad it tells the computer not to allow the engine to start. Check out the images (below). Please let us know what you find. We are interested to see what it is.

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