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Old 10-16-2012, 07:28 PM   #1
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Default possible bad ecm?...need help

Hey guys.
first of I just found this site...really cool...I was googling my problem....
any way let's get to the hurt...I have a 1991 jeep Cherokee sport, 4.0, 4x4, with a 5 speed..
Other nite it died on me .the 30 amp en.gine control fuse was blown..replaced it blew again.
so I have a short...I used a test light and probed both terminals for the fuse and it lights up.
so I pull the two relays and it still lights the test light...according to my repair book the only components in that circuit are the two relays and the ecm
When I unpluged the ecm the test light went off.
Am I over looking something or is my ecm bad?...I really don't wanna spend the cash on a new ecm...
Thanks
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Old 10-16-2012, 08:09 PM   #2
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I saw someone else posted a similar problem were their o2 wires melted on the header...I checked mine wires were melted....so I disconnected o2 and spred wires apart to isolate them and it is still shorting out.......??????
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Old 10-16-2012, 08:43 PM   #3
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Quote:
Originally Posted by azredneck View Post
I saw someone else posted a similar problem were their o2 wires melted on the header...I checked mine wires were melted....so I disconnected o2 and spred wires apart to isolate them and it is still shorting out.......??????

Try disconnecting the o2 sensor from the clip to the harness.
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Old 10-16-2012, 10:10 PM   #4
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Yea I disconnected the 02...still is shorting...and I disconnected the balist resistor
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Old 10-17-2012, 12:48 AM   #5
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Here's the pinout for a '92 ECM connector, hopefully the '91 is the same. I'd pull the plug and check each sensor circuit for shorts to ground.
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possible bad ecm?...need help-92-pcm-pinout.jpg  

Last edited by Radi; 10-17-2012 at 12:50 AM.
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Old 10-24-2012, 12:37 PM   #6
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Default Tires? Pix

Quote:
Originally Posted by azredneck View Post
Hey guys.
first of I just found this site...I have a 1991 jeep Cherokee sport, 4.0, 4x4, with a 5 speed
Not to hijack your thread az', but I noticed in your Cherokee description that you were running 30x10.5R15 tires.

I have a chance to buy a used set [4] of that size for $100 locally.

Would you have a picture of your Cherokee sitting on those? Any advice as to whether they might be able to be shoe-horned into a stock lift?

Anyone else?

...thanks
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Old 10-27-2012, 12:56 PM   #7
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Quote:
Originally Posted by brdavis9 View Post
Not to hijack your thread az', but I noticed in your Cherokee description that you were running 30x10.5R15 tires.

I have a chance to buy a used set [4] of that size for $100 locally.

Would you have a picture of your Cherokee sitting on those? Any advice as to whether they might be able to be shoe-horned into a stock lift?

Anyone else?

...thanks
Well I figured out the jeep...the wire melted in another spot on the header that I didnt see the first time...she is running good now.

As for the tires.....when I bought the jeep it was stock lift with the 30" tires....so it will work for u....might have have a little tire rub off road....I would show u a pic of my jeep but not sure how to post pics yet....$100 I think is a good deal for tires
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Old 11-17-2012, 11:22 AM   #8
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Quote:
Originally Posted by azredneck View Post
As for the tires.....when I bought the jeep it was stock lift with the 30" tires....so it will work for u....might have have a little tire rub off road....I would show u a pic of my jeep but not sure how to post pics yet....$100 I think is a good deal for tires
Thanks!

...someone else thought they were a good deal too.

I ended up with new P235/75R15's after all.
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Old 11-17-2012, 11:22 AM
 
 
 
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