Where is the ignition control module - JeepForum.com

 
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post #1 of 7 Old 08-07-2012, 12:34 PM Thread Starter
1995XJCountry
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Where is the ignition control module

on a 95 jeep cherokee , 4.0 aw4 auto

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post #2 of 7 Old 08-07-2012, 07:13 PM
tjwalker
It's the crank sensor!
 
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There isn't one. They went away after 1990.

Why are you asking?

99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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post #3 of 7 Old 08-08-2012, 10:21 AM Thread Starter
1995XJCountry
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so what controls it then? Its still electronic ignition , there is no points in the distributor. The CPS? I have a no start condition , turns over nice but no spark at plugs. Changed distributor , cap , rotor , plugs , pickup coil , plug wires and still no change. I was told to test cps , i think i did it correctly and got a reading of .01 on 20k ohms so.. i geuss thats the next thing , i've just alread put 300 in parts in with no change.. hesitant to pay around 200 for a CPS. I have not once changed a sensor in my life , not that i've owned many vehicles that even have sensors.
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post #4 of 7 Old 08-08-2012, 11:08 AM
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CPS is on the driver side of the bell housing. Find the connector on top of the intake, behind the throttle body and follow the wires down. Should be two bolts. Access is from under the jeep. It is a little tight but very managable.

2000 XJ Limited, 4.5 Rusty's All spring lift; 265/75/16 BFG KM2's; 4.0, aw4, 242.
2001 XJ Sport, 4.5 Rusty's lift, 32x1150x15 Hankook Dynapro MT's. 4.0, aw4, 231, 8.25 rear with power trax locker.
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post #5 of 7 Old 08-08-2012, 11:32 AM Thread Starter
1995XJCountry
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i know where it is and i've tested it but wtf is infinity.. it zeros out at .01 on 20k ohms , is that low resistance or infinity? Is the cps what controls ignition now ? It doesnt make sense , if there is no ICM they had to replace it with something
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post #6 of 7 Old 08-08-2012, 06:35 PM
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.

99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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post #7 of 7 Old 08-08-2012, 08:30 PM Thread Starter
1995XJCountry
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Alright , thanks Tj , it makes sense to me now , usually the ignition control module told it when to fire , i geuss on dodge it's the CPS.
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