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Vehicle just stopped would not start, cranks over fine?

Tiny
WILLE16
  • MEMBER
  • 1999 JEEP WRANGLER TJ
  • 4.0L
  • 4WD
  • AUTOMATIC
  • 82,000 MILES
Replace crankshaft sensor. It started idle rough. I started checking connections unplugged connections on ECM and cleaned but not seeing that I bent one of the pins and plugged it back in trued starting it wouldn’t start shut down relay was buzzing.

I unplugged the black plug from ECM and found broken pin was shorting across other pins. I got a replacement ECM now it will not start; it cranks over just fine also replaced camshaft sensor. Still no start.

Checked for power to ECM that’s okay checked grounds at ECM ok check for the 5 bolts from ECM it’s okay. Something I should have said at first was when it first stopped there were some codes about a bad fuse but couldn’t find any blow ones. Checking other things unhooked battery when I hooked it back up there are no codes showing even after cranking engine a whole lot and there is no RPM showing when cranking the check engine light will come on after cranking engine for a few seconds.
This vehicle in in great shape all the wiring is good only thing this vehicle set in a damp basement for a few years, and I had trouble with the turn signal took the turn signal switch apart and it was all corroded I cleaned It up put it back together and it has worked find. Also, there is no spark there is fuel.

That’s all I can think of now.
Thanks for any help you can provide.
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Sunday, October 8th, 2023 AT 7:59 AM

25 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,070 POSTS
When you checked for spark did you remove the coil wire to check, or the spark plug wire? I have seen the ignition rotor short out and not allow the spark to be generated from the ignition distributor. I would check for power on the positive side of the coil (key on) as well.

These two guides can help us get started on fixing the problem:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

And this video can help you check for spark from the ignition coil:

https://youtu.be/baq_aEWNQ0Y?si=xLrMHNn0bUVyF7rQ

Please go over these guides and get back to us.
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Monday, October 9th, 2023 AT 9:08 AM
Tiny
WILLE16
  • MEMBER
  • 13 POSTS
Sorry for the long wait but life happens. And thanks for the advice. Okay, checked for spark from coil. No spark to plug or to rotor cap.
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Monday, October 16th, 2023 AT 12:35 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,070 POSTS
Good job, most of the time what happens is the crankshaft angle sensor goes out, here is the location so you can check it out. Also, please check all fuses with the system on, this guide can help:

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

Check out the images (below). Please let us know what happens.
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Tuesday, October 17th, 2023 AT 9:26 AM
Tiny
WILLE16
  • MEMBER
  • 13 POSTS
I replaced the crankshaft sensor, and it will still not start. Thought that maybe the new one was bad so I replaced it and still will not start.
Also replaced camshaft sensor still not start but still cranks fine. Checked fuses didn’t find any bad ones.
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Tuesday, October 17th, 2023 AT 9:53 AM
Tiny
KEN L
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  • 43,070 POSTS
Still no spark, correct? Let's check the fuses I have featured below for power; this guide can help:

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

If the fuses are okay let's swap out the auto shutdown relay.
Check out the images (below). Please let us know what happens.
Image (Click to make bigger)
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Thursday, October 19th, 2023 AT 10:37 AM
Tiny
WILLE16
  • MEMBER
  • 13 POSTS
Check fuses tried switching out relays still no start.
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Friday, October 20th, 2023 AT 5:38 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,070 POSTS
Does the ignition system have spark? Please check out this guide:

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

Please go over this guide and get back to us.
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Monday, October 23rd, 2023 AT 12:31 PM
Tiny
WILLE16
  • MEMBER
  • 13 POSTS
Check for spark. There aren’t any. Check coil there were some cracks in housing, so I replaced the coil and still no spark.
So far, I have replaced the crankshaft sensor with the camshaft sensor and now the coil and yes ECM. And still cranks fine but no spark.
The fuel pump is working. But there are no codes showing and when cranking the RPM does not move.
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Saturday, October 28th, 2023 AT 7:06 AM
Tiny
KEN L
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Okay, can you turn the key on and while using a test light check the positive side of the coil for power?

Here is a guide to help:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Remove the connector and test terminal #1, if no power is present swap out the auto shutdown relay.

Check out the images (below). Please let us know how it goes.
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Monday, October 30th, 2023 AT 9:16 AM
Tiny
WILLE16
  • MEMBER
  • 13 POSTS
No power.
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Saturday, November 4th, 2023 AT 5:22 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,070 POSTS
Okay, let's check for power at the fuse #18 in the under hood fuse panel, this guide will help, key on.

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

Please let us know what happens.
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Sunday, November 5th, 2023 AT 11:22 AM
Tiny
WILLE16
  • MEMBER
  • 13 POSTS
I have checked all the fuses under the hood and behind the glove box all are good.
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Monday, November 6th, 2023 AT 1:05 PM
Tiny
KEN L
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Yes, but does it have power?
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Tuesday, November 7th, 2023 AT 8:29 AM
Tiny
WILLE16
  • MEMBER
  • 13 POSTS
Sorry about that. No.
Another thing I checked was for 60 ohms on the can bus.
I checked on the test port under driver’s side of the dashboard I have no reading on either high or low bus. Both grounds are working, and I have 12v but that is all.
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Wednesday, November 8th, 2023 AT 11:39 AM
Tiny
KEN L
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Okay, since you don't have power at #18 I would change out the auto shutdown relay. Which I mentioned above.
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Thursday, November 9th, 2023 AT 7:34 AM
Tiny
WILLE16
  • MEMBER
  • 13 POSTS
Try that by switching it with other relays, still the same no power.
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Thursday, November 9th, 2023 AT 1:06 PM
Tiny
KEN L
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When you turn the key on can you feel the ASD relay click? You may need a helper with this test.
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Friday, November 10th, 2023 AT 9:28 AM
Tiny
WILLE16
  • MEMBER
  • 13 POSTS
No there is no click.
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Sunday, November 12th, 2023 AT 8:12 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Please recheck fuse #19 and fuse #6 in the fuse panel under the hood. If the fuse is okay sway out the ASD relay. Let me know how it goes.
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Monday, November 13th, 2023 AT 9:13 AM
Tiny
WILLE16
  • MEMBER
  • 13 POSTS
Fuses are okay, swapped out relay, still the same crank no start.
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Wednesday, November 15th, 2023 AT 3:23 AM

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