No fire to the spark plugs

Tiny
WILL16
  • MEMBER
  • 2005 KIA SEDONA
  • 3.5L
  • V6
  • 2WD
  • 171 MILES
My car cut off on me while I was driving it and would not start backup. The code came up to be a crankshaft position sensor so I changed that an the camshaft sensor too. It turns over but wont start the timing is good, but I am not getting fire to the spark plugs. Got another reading code p0343 charge up battery still no fire to the spark plugs. Change computer with the same numbers still getting same reading p0343 true, but wont start. I am not getting power from somewhere. Can someone help me with this?
Saturday, October 29th, 2016 AT 8:45 PM

12 Replies

Tiny
JIS001
  • MECHANIC
  • 3,412 POSTS
Crank sensors are almost the majority of the fault with these vehicles. If you used an off brand sensor I recommend you use a dealer one instead, especially with a job like this one. Had a 1997 Suburban couple months ago for no start. No fuel pressure but would not start with carburetor cleaner either. Replaced the fuel pump and crank sensor with an off brand. I still had a hard start and had to trick the coil to start.

Anyways after going back and forth I installed a Delphie crank sensor (OE FOR GM) and problem was fixed. Let us know what brand sensor you installed and we will advise from there.
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Saturday, October 29th, 2016 AT 11:52 PM
Tiny
WILL16
  • MEMBER
  • 6 POSTS
It is coming up camshaft sensor now crankshaft position sensor gone now. Do I need to put the old camshaft position sensor back on their was nothing wrong with it I just changed it because I was in there.
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Sunday, October 30th, 2016 AT 2:58 PM
Tiny
JIS001
  • MECHANIC
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Yes, try that first.
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Sunday, October 30th, 2016 AT 4:32 PM
Tiny
WILL16
  • MEMBER
  • 6 POSTS
Put old camshaft position sensor back on code gone still turn over but wont start. Check fuel pump when I turn the ignition on it spay for two seconds then stop I try turning it to crank it do the same thing. Is the fuel pump bad?
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Monday, October 31st, 2016 AT 1:41 PM
Tiny
JIS001
  • MECHANIC
  • 3,412 POSTS
No, it is suppose to do that. Any more codes coming up? Can you look at data with your scanner. Look to see if you have an rpm's reading when cranking engine over.
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Monday, October 31st, 2016 AT 2:48 PM
Tiny
WILL16
  • MEMBER
  • 6 POSTS
No rpm
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Monday, October 31st, 2016 AT 3:55 PM
Tiny
JIS001
  • MECHANIC
  • 3,412 POSTS
Attached the wiring diagram. Verify you have battery power to pin #3 Brown wire of your crank sensor with key on. If no power then check all your fuses. The 15A fuse with designation INJ is what feeds the power. If ok check wire at pin#1 Yellow with green stripe to the computer connector B pin#5 diagram shows what it looks like. Measure resistance. Should be just under 1 ohm. If no resistance then you need to trace for an open circuit. Also check that wire for a short to ground and power by back probing pin #1 on crank sensor connector and other lead touching the battery ground and battery positive terminals. Make sure ECM connector is unplugged while doing this. Then check pin #2 which is black. Chcek it to the negative terminal on battery or chassis ground. If just under 1 ohm your good. No resistance then look for an open in the wire.

If all your checks are good then I would recommend you replace the crank sensor with a better quality sensor. It is possible to remove without removing the belt. Loosen the tensioner and pivot the roller away from the sensor to access the bolt. Let us know how the checks go.
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Monday, October 31st, 2016 AT 6:01 PM
Tiny
JIS001
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  • 3,412 POSTS
Forgot to mention when doing the check to battery terminals there should be no reading. If there is then you have a short somewhere in that circuit.
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Monday, October 31st, 2016 AT 6:07 PM
Tiny
JIS001
  • MECHANIC
  • 3,412 POSTS
I wish I could edit my reply. That will be the yellow with green stripe. Sorry it was a long day.
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Monday, October 31st, 2016 AT 6:08 PM
Tiny
WILL16
  • MEMBER
  • 6 POSTS
I Thank You so much. I'll try this tomorrow and let you know
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Monday, October 31st, 2016 AT 6:31 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Please let us know what you find so it will help others.

Best, Ken
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Wednesday, November 2nd, 2016 AT 9:01 AM
Tiny
WILL16
  • MEMBER
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Will do
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Wednesday, November 2nd, 2016 AT 10:42 AM

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