No power at the coil. - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > No power at the coil.

FS: Wranger BRIGHT License Plate LED! Just $3! Great valueEngo winches available at www.rockridge4wd.com! Free shippROCKRIDGE4WD Introduces a NEW Jeep Wrangler JK *led* tail

Reply
Unread 02-17-2013, 09:20 AM   #1
redbird555
Registered User
 
Join Date: Apr 2011
Location: pompano beach, Florida
Posts: 6
No power at the coil.

Hey guys the other day out of nowhere my 95 i4 wouldn't start. I've verified that the injectors get power with the key on, the fuel pump primes I just have no power at the coil plug. The distributor and crank sensor has been recently replaced and seem to check out fine I'm going to pull the PCM and verify I have a coil signal. But does anyone have ideas??

redbird555 is offline   Reply With Quote
Unread 02-17-2013, 10:35 AM   #2
Mark05059
Registered User
1989 YJ Wrangler 
 
Join Date: Mar 2009
Location: quechee Vermont
Posts: 4,266
turn the key to on and watch for a check engine light. It should come on and go off in a few seconds.If it does then the following is not your problem. If it doesnt come on just leave the key in the on position and wait (might be up to a couple of minutes). IOnce the light comes on (you probably will hear a bunch of clicking too) start the jeep.
__________________
1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
Mark05059 is offline   Reply With Quote
Unread 02-17-2013, 12:13 PM   #3
redbird555
Registered User
 
Join Date: Apr 2011
Location: pompano beach, Florida
Posts: 6
yep if i turn the key on i get the normal check engine light and after a few secs it goes off. I kept checking wires and I think i have arrived at the fact the pcm is bad. the asd is supplying power to the pump and thus the coil but I have no power there, i have power at the ignition fuse on the blcok also. I also checked the crank sensor harness coming from the pcm and at the sensor and realized no matter what I do there is no power in the harness.
redbird555 is offline   Reply With Quote
Unread 02-17-2013, 03:45 PM   #4
laybackman
Bikini Bridge Inspector
 
laybackman's Avatar
1995 YJ Wrangler 
 
Join Date: Dec 2002
Location: Massachusetts
Posts: 6,002
Quote:
Originally Posted by redbird555 View Post
yep if i turn the key on i get the normal check engine light and after a few secs it goes off. I kept checking wires and I think i have arrived at the fact the pcm is bad. the asd is supplying power to the pump and thus the coil but I have no power there, i have power at the ignition fuse on the blcok also. I also checked the crank sensor harness coming from the pcm and at the sensor and realized no matter what I do there is no power in the harness.
Unplug the VSS sensor on your transfer case and see if it starts.
__________________
Chicks dig me.....Fish fear me

If your girl is throwing gang signs with her toes you're hitting the spot.

"If we cannot afford to take care of Veterans, then we should stop making them."
David C. Wilker Jr. USAF (RET)
laybackman is offline   Reply With Quote
Unread 02-17-2013, 05:53 PM   #5
Mark05059
Registered User
1989 YJ Wrangler 
 
Join Date: Mar 2009
Location: quechee Vermont
Posts: 4,266
might also have to follow wires from the coil back
__________________
1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
Mark05059 is offline   Reply With Quote
Unread 02-17-2013, 06:50 PM   #6
Mr.B
Wot's...uh The Deal?
 
Mr.B's Avatar
1994 YJ Wrangler 
 
Join Date: Nov 2005
Location: Roseville, Ca.
Posts: 3,227
Check your diagnostic codes. Here are the links on how to do it in the FAQs section. It could be your CPS(crank position sensor).

http://www.jeepforum.com/forum/f12/f...54/#post682627

http://www.jeepforum.com/forum/f12/f...54/#post682636
__________________
.
White '94 YJ 2.5L 5 speed, 35" BFGs KM2's, 5" lift, Mark VII 2 speed fan, Milemarker PE8000, Front Aussie Locker, Power steering conversion, '98 Cavalier seats, MORE Boomerangs in front, 136 amp ZJ alternator, JB conversions SYE, Tom Woods custom drive shaft, 8.8 with ARB, 4.88 gear ratio, Teralow

My Jeep

'89 XJ Laredo Bone Stock

Member:The Wrecking Crew

Ham license:
KB6(tooeasytosearch)

Everyone is Welcome
www.rubiconramblers.com

Quote:
Originally Posted by Major Sanderson
You have no respect for excessive authority or obsolete traditions. You're dangerous and depraved, and you ought to be taken outside and shot!
Quote:
Originally Posted by Beefstew
I may have proven that I am in fact an idiot, by all of your standards...
Quote:
Originally Posted by ritjobbie View Post
Mr.B's post gets you as close to Buddha as you can get on JF...
Mr.B is offline   Reply With Quote
Unread 02-17-2013, 07:45 PM   #7
mike_breaker_5
Web Wheeler
 
mike_breaker_5's Avatar
1994 YJ Wrangler 
 
Join Date: Oct 2009
Location: emporium,, pennsylvania
Posts: 2,952
ASD relay?
__________________
Ratmonkey donation page. all proceeds will go to his family.
http://www.youcaring.com/memorial-fu..._source=widget


it's not much to look at... but it's mine.
5.2lswap, metalcloaks, bedliner, tucked belly, d60's, soon to be nv4500 and d300.
http://www.jeepforum.com/forum/f22/m...r-junk-990191/
mike_breaker_5 is offline   Reply With Quote
Unread 02-18-2013, 07:09 AM   #8
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,547
You are not reading the coil power correctly(Maybe). You need to read with one side to the coil and the other to ground on the chasis. You cant read across the coil to check power.
Que89YJ is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.