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Car Forum / Jeep / April 2007

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ECM for 93 YJ

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paul - 26 Apr 2007 03:58 GMT
Anyone know where to find an ECM module for a 93 YJ, I-6, Automatic?

thanks
paul
Mike - 26 Apr 2007 04:20 GMT
> Anyone know where to find an ECM module for a 93 YJ, I-6, Automatic?
>
> thanks
> paul

 You didn't mention new or used. Here are a few places to try.

    http://www.car-part.com/

   http://www.chryslerpartsdirect.com/

   http://www.rockauto.com/
L.W. (Bill) Hughes III - 26 Apr 2007 04:31 GMT
Powertrain Control Module:
http://www.billhughes.com/temp/XJ_YJ_PCM_location.jpg
       God Bless America, Bill 0|||||||0
mailto:LWHughes3rd@aol.com

> Anyone know where to find an ECM module for a 93 YJ, I-6, Automatic?
>
> thanks
> paul

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paul - 26 Apr 2007 12:54 GMT
Yes - thank you Bill -  PCM
new/used no difference as long as it is functional.

thanks
paul

>    Powertrain Control Module:
> http://www.billhughes.com/temp/XJ_YJ_PCM_location.jpg
[quoted text clipped - 5 lines]
>> thanks
>> paul
Mike Romain - 26 Apr 2007 14:43 GMT
> Anyone know where to find an ECM module for a 93 YJ, I-6, Automatic?
>
> thanks
> paul

Just FYI, if the ground strap that runs from the rear of the engine head
up to the firewall goes punky, it will cause a computer failure.

So can the recall on the emergency brake if they forget to hook up one
wire onto the bolt there.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos:  Non members can still view!
Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590
(More Off Road album links at bottom of the view page)
paul - 27 Apr 2007 12:57 GMT
Ground strap is verified, brake wires are solid.....
? ?  ?

>> Anyone know where to find an ECM module for a 93 YJ, I-6, Automatic?
>>
[quoted text clipped - 12 lines]
> Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590
> (More Off Road album links at bottom of the view page)
Mike Romain - 27 Apr 2007 14:36 GMT
Some folks have been told their ECM is dead after getting the emergency
brake recall done.  There is a wire there on a bolt that is the ground
for the fuel pump and if the 'tech' doesn't know about it, it can be
left off and nothing they can do will make the pump work so they think
the main ECM is dead.

The other grounds for the ECM are near the oil dipstick bolted onto the
block.

It is a bit unusual to hear of a dead computer in a YJ...

Mike

> Ground strap is verified, brake wires are solid.....
>  ? ?  ?
[quoted text clipped - 15 lines]
>> Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590
>> (More Off Road album links at bottom of the view page)
paul - 27 Apr 2007 18:10 GMT
Well - this is all related to an "assumed" tranny problem, after having much
work ($$$) done the problem wasn't fixed - Went back to tranny shop and they
claimed a spark or vacuum problem. I changed plugs, wires, cap, rotor, and
even the ignition coil. no improvement. Went to a recommended service shop -
they told me that the crack in the exhaust manifold was causing the O2
sensor to mis-read and this created the tranny shifting problem --- well -
after replacing the manifold there is no improvement in performance:
From dead stop - full throttle the vehicle is slow (I6 4.0 3.07 gears - it
should be like a rocket) remaining at full throttle it will wind up and not
change gears unless foot is let off throttle. Then at highway speeds when
trying to pass it used to rev up to 3500 rpm's with no drive train
response - now (after second visit to tranny shop) it will not go over 60
mph on the freeway and rpm's remain constant (although if I put it in
neutral it will rev up).

So the service shop is guesstimating that the computer is bad - but finding
one is proving difficult - the service shop is continuing diagnosis to see
if they can verify the computer is faulty......

thanks
paul

> Some folks have been told their ECM is dead after getting the emergency
> brake recall done.  There is a wire there on a bolt that is the ground for
[quoted text clipped - 28 lines]
>>> Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590
>>> (More Off Road album links at bottom of the view page)
Mike Romain - 27 Apr 2007 18:53 GMT
You are describing a failure in the TPS to me.

The plug and socket on it get dirty and need cleaning on a regular
basis. This controls throttle response and shifting.  I recommend an
electronic spray contact cleaner, but even WD40 will do in a pinch.

If you have a multimeter I can give you the electrical test info for the
TPS also.

Mike

> Well - this is all related to an "assumed" tranny problem, after having much
> work ($$$) done the problem wasn't fixed - Went back to tranny shop and they
[quoted text clipped - 50 lines]
>>>> Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590
>>>> (More Off Road album links at bottom of the view page)
paul - 27 Apr 2007 23:58 GMT
I went through all connections and cleaned them and added die-electric
grease.....

BUT -
I got a call from the shop this afternoon and they found the problem - I got
Helen (that's what I call her) back today and everything is fine - I spent
WAY too much money trying to chase this problem down.

It was the distributor !

So - did I need to rebuild the transmission?
I'm guessing no - and I will have a few words with them about it on Monday.

Did I need the new exhaust manifold?
It was cracked but it wasn't effecting performance - but it is a nice to
have as I plan on keeping this jeep for a long time.

Did I need to buy new plugs, wires, rotor, cap and ignition coil?
The distributor cap was VERY corroded with that white powdery dusty stuff
(maybe that was a clue) but other than that everything else was still in
good condition.

All I really know is that in the last 4 weeks 'Helen' has only been home for
about 5 days and I missed her dearly - it feels good to have her back (my
pocket book will recover). I also am thankful that the service shop was
relentless in tracking this solution down, I was really starting to worry.

Thanks to all for the tips and tricks.
paul

> You are describing a failure in the TPS to me.
>
[quoted text clipped - 62 lines]
>>>>> Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590
>>>>> (More Off Road album links at bottom of the view page)
 
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