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  #1  
Old February 14th, 2009, 13:03
98 jeepjeep's Avatar
98 jeepjeep 98 jeepjeep is offline
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3 CODES!!! Need help

Since i bought my 98 4.0 Auto XJ it has had weird random Elec. Issues causing shifting issues. Nothing that feels Mechanical.

P0700= Trans control System Malfunction.
P0122=Tps/Pedal Pos sensor A circuit Low imput.
P0705=Trans range circuit Malfunction.

After seeing the TPS code i replaced it with several JY units and then eventually 2 New ones....So is there a solenoid inside the trans pan i can replace or whats going on?
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  #2  
Old February 14th, 2009, 13:09
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Re: 3 CODES!!! Need help

Looks like the TCM is bad.
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  #3  
Old February 14th, 2009, 13:09
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Re: 3 CODES!!! Need help

I got the P0700 and 705 a couple times. I got a different code with those too, not quite sure what it was.i just cleared the codes and was on my way!
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Old February 14th, 2009, 13:20
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Re: 3 CODES!!! Need help

Quote:
Originally Posted by CSaddict View Post
Looks like the TCM is bad.
what is that lol?? and where is it?
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  #5  
Old February 14th, 2009, 14:02
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Re: 3 CODES!!! Need help

range circuit malfunction would suggest neutral safety switch is bad.
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  #6  
Old February 14th, 2009, 15:20
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Re: 3 CODES!!! Need help

Quote:
Originally Posted by 98 jeepjeep View Post
Since i bought my 98 4.0 Auto XJ it has had weird random Elec. Issues causing shifting issues. Nothing that feels Mechanical.

P0700= Trans control System Malfunction.
P0122=Tps/Pedal Pos sensor A circuit Low imput.
P0705=Trans range circuit Malfunction.

After seeing the TPS code i replaced it with several JY units and then eventually 2 New ones....So is there a solenoid inside the trans pan i can replace or whats going on?
You could benefit from this site.
http://www.transonline.com/transdige...ers/index.html
At least you can see what some of the codes are...........Page 2
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  #7  
Old February 14th, 2009, 16:25
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Re: 3 CODES!!! Need help

Im gonna try to replace the TCU tommorow does anyone know what year the TCU's are the same? i can get my hand on a couple 2000 model XJ's....would they be a direct swap for my 98?

Last edited by 98 jeepjeep; February 14th, 2009 at 16:42.
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  #8  
Old February 14th, 2009, 16:37
rydizzy rydizzy is offline
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Re: 3 CODES!!! Need help

This might help.

http://www.naxja.org/forum/showthread.php?t=12575
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  #9  
Old February 14th, 2009, 16:53
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Re: 3 CODES!!! Need help

I've had those codes as well. It was the Transmission Control Module (TCM). I have a 98 as well. It's located under the dash on the driver's side. Just a little silver box. Put in one from a jy, fixed it.

I actually have a spare one. Let me know if you're interested.
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Old February 14th, 2009, 17:19
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Re: 3 CODES!!! Need help

Quote:
Originally Posted by jeepster_259 View Post
I've had those codes as well. It was the Transmission Control Module (TCM). I have a 98 as well. It's located under the dash on the driver's side. Just a little silver box. Put in one from a jy, fixed it.

I actually have a spare one. Let me know if you're interested.
Thank you for your reply Is the box mounted on the left side of the firewall under the DS dash? will a 00 TCM work? and what tools do i need remove it?
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  #11  
Old February 14th, 2009, 19:46
lawsoncl lawsoncl is offline
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Re: 3 CODES!!! Need help

Quote:
Originally Posted by CSaddict View Post
Looks like the TCM is bad.
Huh? This is NOT A BAD TCM. The P0700 and P0705 usually mean you just need to clean the Neutral Safety Switch (NSS). Here's a good writeup. http://www.go.jeep-xj.info/HowtoNSSrebuild.htm. If you aren't careful and break it getting it off, try www.teamcherokee.com for a replacement.

The P0122 is usually a bad TPS sensor or possibly wiring to the sensor.
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  #12  
Old February 15th, 2009, 13:46
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Re: 3 CODES!!! Need help

just a update i replaced the TCU with a JY unit and the codes when away on the first key cycle. My Highway rpms are back to normal. Only time will tell about the NSS codes.
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  #13  
Old February 16th, 2009, 06:23
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Re: 3 CODES!!! Need help

glad that fixed it!
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