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Unread 02-17-2013, 10:20 AM   #1
redbird555
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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??

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Unread 02-17-2013, 11:35 AM   #2
Mark05059
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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.
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Unread 02-17-2013, 01:13 PM   #3
redbird555
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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.
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Unread 02-17-2013, 04:45 PM   #4
laybackman
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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.
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Unread 02-17-2013, 06:53 PM   #5
Mark05059
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might also have to follow wires from the coil back
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/l , [____],
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()_) ()_)==O=)_)
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Unread 02-17-2013, 07:50 PM   #6
Mr.B
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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
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Unread 02-17-2013, 08:45 PM   #7
mike_breaker_5
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ASD relay?
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Unread 02-18-2013, 08:09 AM   #8
Que89YJ
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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.
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