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Unread 09-19-2013, 05:30 PM   #1
Nolvck
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1996 ZJ 
 
Join Date: Aug 2012
Location: Dallas, Texas
Posts: 18
Speed sensor headache

I have seen a million threads on these things but none of them have the answer to my problem. I had a code for output speed sensor so I replaced it as well as the vehicle speed sensor. I disconnected the battery to reset codes and it seemed to be fixed. Drove it down the road and light came back on and symptoms reappeared. Anyone know of a fix? Code still reads bad sensor, speedo still freaks, and it continues to stall/not shift properly. Any advice is helpful at this point. Thank you

I have a 4.0 with a 42RE...
Fluid levels are where they should be...

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Unread 09-19-2013, 07:19 PM   #2
Nolvck
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1996 ZJ 
 
Join Date: Aug 2012
Location: Dallas, Texas
Posts: 18
Shows code p0720
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Unread 09-19-2013, 07:54 PM   #3
ZeeJay1997
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1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,219
As you can see in the diagram, it's a straight shot to the PCM, middle connector.

So you've got a wiring or connector problem, a bad PCM...not likely but not out of the question, or a bad replacement sensor... even more unlikely.

Check the harness from the transmission for chaffing or damage. Then pull and clean PCM connectors.
output-speed.jpg

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Unread 09-19-2013, 09:21 PM   #4
Nolvck
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1996 ZJ 
 
Join Date: Aug 2012
Location: Dallas, Texas
Posts: 18
I will give that a try this weekend. Do you think I can determine bad wiring with volt meter? Or do I have to just follow the wires?
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