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  #13  
Old 05-17-2013, 06:37 PM
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Re: Transmission issue

Maybe ill take some pictures for you guys too while I'm down there. And thank you that would be awesome
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  #14  
Old 05-17-2013, 10:07 PM
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Re: Transmission issue

Yesss, we like pictures.
Attached the wiring schematic for the 42re. The temperature sensing circuit is just one wire running from the PCM to the transmission. You will need to make one long test wire which will connect to the PCM connector C2 point 1 and the other to the transmission connector point 8. Donīt forget to remove the negative battery connector before attempting to remove any connector. Also never touch the PCM connector pins with you bare hands. Static electricity can build up in our body depending on which type of clothes you use, air humidity and type of shoes, and this charge can easily burn the electronics circuits inside the PCM (or any other electronic device).
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File Type: pdf 42re wiring.pdf (165.9 KB, 8 views)
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  #15  
Old 05-18-2013, 08:50 AM
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Re: Transmission issue

theres how the wires look. not so good. so im going to guess thats my issue. i still need to double check with the multimeter.
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  #16  
Old 05-18-2013, 06:13 PM
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Re: Transmission issue

It looks that the purple wire isolation is partly gone. If the wire contacts any metal from the casing, it could make a short or a wrong feedback. I will see what the colour of the temperature sensor wire is.
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  #17  
Old 05-18-2013, 06:32 PM
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Re: Transmission issue

Just confirmed that the temperature sensor circuit wire is violet, so seems to be the wire which has the isolation damage. How could this happen like this? Doesn't seem to be chaving.
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  #18  
Old 05-18-2013, 06:40 PM
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Re: Transmission issue

Well that's a long story. Basically from the place I bought it, the jeep had some issues I couldn't see in just a test drive. But how I came into this was they took the thermostat out so it fooled the computer to think it never warmed up. I put the thermostat in to find out they pulled the o/d off And trans over temp bulbs out of the cluster. So I'm assuming they tried to jimmy something to fix it And it didn't work And just left the wire exposed. But a wire on the speed sensor is chaved off And also another connector that goes into the transmission that has 3 ends.
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Old 05-18-2013, 07:20 PM
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Re: Transmission issue

That is a place to never buy again, what a bad workmanship. Those wires need to be isolated at least. So as long you have the jeep it has never used 4th gear. Should have used some fuel.
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Old 05-18-2013, 07:23 PM
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Re: Transmission issue

oh it definitely was using it up when i first got it. but the weird thing is though is that after it drives for a little while it will shift into fourth. so you think that if i was to replace that wire going into the connector that maybe it would change the resistance back to normal and hopefully restore everything to normal function?
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Old 05-18-2013, 08:05 PM
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Re: Transmission issue

Difficult to tell, since they where fouling around for some reason. Maybe the reason was the temperature sensor and they didn' t want to open up the transmission. So at least it will be a good beginning and maybe even the whole solution.
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  #22  
Old 05-18-2013, 08:12 PM
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Re: Transmission issue

Now the next trick is getting the right wiring so it'll match to the factory specs. Which I believe according the diagram you sent me it runs off of 5v?
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  #23  
Old 05-19-2013, 05:33 AM
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Re: Transmission issue

No, the 5V is used for the governor pressure sensor. The schematic doesnīt show the voltage the PCM is putting out to this wire, but the wire spec is mentioned.
The specification is: T54 18 VT. T54 is the number of the circuit. 18 is the wire size (gauge 18) and VT the colour (so violet). But if its only the isolation which is removed, you could also only repair the isolation itself, as long as there is no corrosion on the core wire. Or otherwise splice a new part in between. When you want to change the whole wire, then you have to get new connector pins as well and i have no idea where to get those.
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  #24  
Old 06-05-2013, 10:17 AM
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Re: Transmission issue

Alright guys. Sorry about the long response time. Thank you Florida early raining season. Anyway, I bit the bullet And spliced a new line where to jacket was cut off. Looks good so far. Drove around 15 miles And no ill effects. But when I come to a stop And put the transmission in reverse it feels like its going to stall.
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