88 XJ Transmission Will Not Shift Itself - JeepForum.com
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post #1 of 4 Old 11-17-2013, 03:06 PM Thread Starter
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1988 XJ Cherokee 
Join Date: Oct 2006
Location: Rural Backwoods
Posts: 57
88 XJ Transmission Will Not Shift Itself

My 88 XJ automatic trans (AW-4) will only shift if it is manually shifted. I have read that the majority will point to the TPS (throttle position sensor) as the most likely culprit. I have installed a new quality TPS and it did not provide me with the solution to the problem. I would like to get opinions from you with experience on where I should focus my efforts next. Thanks!!!

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post #2 of 4 Old 11-18-2013, 02:25 AM
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1992 XJ Cherokee 
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Transmission control module. Under glove box. Look for fuses for the transmission first.

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post #3 of 4 Old 11-19-2013, 03:22 PM
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1989 YJ Wrangler 
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If not the module you may need to drop the pan and change the filter. If the filter is blocked you will not generate the pressure required for it to shift.

89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.

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post #4 of 4 Old 11-19-2013, 06:03 PM
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1990 MJ Comanche 
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FIRST place to look is at this fuse for the tCM.
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TCU fuse.JPG  

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