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Unread 01-08-2014, 10:15 PM   #1
mstokes
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My 98 Jeep cherokee sport with no spark, Please Help!

Hello all, first of all, even though this is my first post, I have been reading over this forum for the last few weeks, really appreciating all of the advice that you guys are able to give, its quite incredible.

So here we go.
I have a 98 Jeep Cherokee Sport with Inline 6
No Spark, tested at the Coil (bypassing the distributor).

Before this problem arised I was installing a relay for Daytime running lights, which I wired in under the dash. - works perfectly, and the car ran for 2 days no problems.

Then, randomly, the jeep wont start. Turns over, I can hear the fuel pump prime when the key is in the on position.

I have replaced the CPS, The Coil, The spark plugs, plug cables.

There are two wires that go into that harness, one is Green and (forgive me, orange or pink stripe?) and the other is grey. Can you guys tell me where those wires end up on the other side? I want to do testing to isolate my problem. If you have any other suggestions I am all ears.

You guys rock

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Unread 01-09-2014, 12:26 PM   #2
tjwalker
It's the crank sensor!
 
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Spark: 12 volts from ignition switch to the ASD relay; when the key is first turned on the PCM provides a ground to the ASD relay to energize it, then the ASD relay passes 12 volts to the coil primary side. If no crank sensor signal is generated after a couple of seconds the PCM cuts the ground to the ASD relay (and fuel pump relay too) and that cuts power to the coil (and fuel pump). Key to START and once again the PCM energizes the ASD relay. Now, a critical element is the crank sensor--no signal from the crank sensor and the PCM won't trigger the coil to provide spark.

I'd start by swapping the ASD relay in the power distribution center (black box under the hood on the passenger side) with another relay. These relays are all the same part number so swapping is not a problem. Simple things first. Good luck and keep us posted!
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Unread 01-09-2014, 01:33 PM   #3
mstokes
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I have already swapped all the relays out.
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Unread 01-09-2014, 09:56 PM   #4
mstokes
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Bump!
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Unread 01-10-2014, 02:28 AM   #5
mstokes
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Resolved the issue, hooked up computer, problem was in the asd circuit.
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Unread 01-10-2014, 06:10 AM   #6
tjwalker
It's the crank sensor!
 
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Quote:
Originally Posted by mstokes View Post
Resolved the issue, hooked up computer, problem was in the asd circuit.
Where exactly in the ASD circuit was the problem? How did you fix?
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Unread 01-11-2014, 02:48 PM   #7
mstokes
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Quote:
Originally Posted by tjwalker View Post
Where exactly in the ASD circuit was the problem? How did you fix?
underneath the pdc there was a one wire shorting on another, separated, electrical tape, replaced fuses, put back together.
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Unread 01-12-2014, 01:30 PM   #8
flippinjeep
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I think I might have the same issue.....but where/what is the pdc?
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Unread 01-12-2014, 05:24 PM   #9
tjwalker
It's the crank sensor!
 
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Quote:
Originally Posted by flippinjeep View Post
I think I might have the same issue.....but where/what is the pdc?
It's the black box under the hood on the passenger side. Flip the cover up to expose relays and fuses.
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Unread 01-13-2014, 12:40 PM   #10
CFL_Cherokee
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I too think I might be having a similar problem. Could you provide a little more detail. Did you remove the fuse box to get underneath and found the short?
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Unread 01-14-2014, 01:54 PM   #11
mstokes
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I would suggest that you get yourself a code reader. If the error about the ASD relay or circuit comes up,id first try swapping relays to see if one of your relays has fried. after that I would lift the fuse box, and check all the wires from your igntion coil to your power distribution center. After that it would run from your ignition on in the console(I believe) but I didn't get that far before resolving the problems. the code reader will end up saving you money and a lot of time and stress.

Cheers.
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98 jeep cherokee , ignition , no spark , starting

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