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  #1  
Old January 14th, 2017, 08:05
tricker tricker is offline
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98 XJ Coil Driver

Can someone tell me where the signal wire for the coil ties into the pcm?
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  #2  
Old January 14th, 2017, 08:39
RCP Phx RCP Phx is offline
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Re: 98 XJ Coil Driver

Terminal A7
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  #3  
Old January 14th, 2017, 10:29
tricker tricker is offline
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Re: 98 XJ Coil Driver

thanks!
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  #4  
Old January 15th, 2017, 14:06
tricker tricker is offline
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Re: 98 XJ Coil Driver

I have no ground switching occuring....

Also my CEL doesn't come on with ignition start any longer....is the PCM fried?
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  #5  
Old January 15th, 2017, 16:34
chuck619120 chuck619120 is offline
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Re: 98 XJ Coil Driver

so why not fix your ground?
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  #6  
Old January 15th, 2017, 18:39
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Re: 98 XJ Coil Driver

I ran directly from pin 7, pin 7 is constant ground
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  #7  
Old January 16th, 2017, 07:15
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90xj06 90xj06 is offline
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Re: 98 XJ Coil Driver

make sure the fuses are all intact for the pcm power. pin a2 should have 12v when in run or start

a22 has 12v constantly

a31 and 32 are ground.

check those first.
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  #8  
Old January 17th, 2017, 16:56
tricker tricker is offline
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Re: 98 XJ Coil Driver

Quote:
Originally Posted by 90xj06 View Post
make sure the fuses are all intact for the pcm power. pin a2 should have 12v when in run or start

a22 has 12v constantly

a31 and 32 are ground.

check those first.
Firstly, thank you for your help!

These check out, still no spark....I've thrown all the parts at it I know to and even some I don't

Are you willing to guide me a little further to remedy the issue?

ALL help is MUCH appreciated
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  #9  
Old January 17th, 2017, 17:52
Jeep Driver Jeep Driver is offline
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Re: 98 XJ Coil Driver

Are you getting a signal from the CPS?
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  #10  
Old January 17th, 2017, 18:04
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Re: 98 XJ Coil Driver

I only have a digital multimeter so I don't know a really good way to tell
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  #11  
Old January 18th, 2017, 11:58
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90xj06 90xj06 is offline
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Re: 98 XJ Coil Driver

with a digital meter set to ac it may show something on it. if you able to just grab a cheap analog meter that would be the best way to check
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  #12  
Old January 23rd, 2017, 18:41
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Re: 98 XJ Coil Driver

appear to be getting signal....
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  #13  
Old January 23rd, 2017, 19:48
JeepNoob JeepNoob is offline
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Re: 98 XJ Coil Driver

I'd back-probe the signal wire on the cam sensor (it's inside the distributor, that's what the distributor plug is for.) and check that next. I don't know about the '97 and later XJ's, but my CEL is literally a peanut-style light bulb with a cover over it. Lack of CEL could be something as simple as a burned-out bulb.

Last edited by JeepNoob; January 23rd, 2017 at 19:51.
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  #14  
Old February 20th, 2017, 18:34
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Re: 98 XJ Coil Driver

definitely getting signal from the crankshaft position sensor... no spark
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  #15  
Old February 21st, 2017, 06:54
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Re: 98 XJ Coil Driver

how are you checking spark? how are you checking ground switching on A7? are your fuel injectors firing?
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