No downshift ?? (AW4)

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May 18, 2019 | 08:41 PM
  #1  
Jeep in question is a 1997 XJ 4x4 4.0L automatic.

Today coming home from work pulling out of the parking lot, it felt as if i had the parking brake on. (but i didnt)
once it got rolling , it felt fine. Then at the next light, it felt sluggish again. Pulled over, shut it down for a couple seconds, then restart and all felt fine.
Got home, had dinner, then took it out to the store. Sluggish again from a start. So i tryed manually shifting into 1st at the light, and it took out like normal.
I just shifted to 3rd at about 20-25 mph.
Check engine light is on. codes are 12 , 45 , 55.
After a bit of research im hearing of electronic "shift solenoids" that can go bad. ???
Any one else have this problem?
AND anyone know where to get a set of these if it is this?
I checked on RockAuto , but they want $175 for a set of 3! O,O
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May 18, 2019 | 09:50 PM
  #2  
Sounds like you are having a computer or solenoid issue for sure. Check your grounds. I forget which fuse/circuit carries power for the TCU on the 97+ XJs. The last set of Solenoids I replaced (coincidentally on a 97) I used a set I bought off of Ebay. I forget the exact price but it wasn't too bad. I think it was around 50 or 60 dollars and included a filter and gasket.

https://www.ebay.com/sch/i.html?_fro...noids&_sacat=0
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May 19, 2019 | 12:23 AM
  #3  
Sound like a bad #1 shift solenoid to me. It it's bad, it'll try start out in 4th gear and skip over 2nd as well. Check the transmission fuse and the wiring to the transmission. The wiring for the solenoids enters the transmission on the drivers side near the middle. You can also measure the resistance of the solenoids at the connector to the trans computer - should be 11-15 ohm from memory. Here's a writeup on replacing the solenoids, which can be done with the trans in the vehicle by dropping the oil pan. https://www.naxja.org/forum/showthread.php?t=987463

$55 on Amazon for the set of three (two shift and one torque converter lockup)
Amazon Amazon

$49 on eBay with pan gasket and filter as well
https://www.ebay.com/itm/Jeep-A340-A...-/191825996810
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May 19, 2019 | 01:05 AM
  #4  
Quote: . You can also measure the resistance of the solenoids at the connector to the trans computer - should be 11-15 ohm from memory.
its probably a bit easier to check at the connector in the engine bay
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May 19, 2019 | 09:24 AM
  #5  
I had a similar issue but with no 2nd or 3rd as solenoid #2 died. As said, it'll try starting in 4th and miss 2nd as 1st and 2nd both require Sol #1 to be active. Providing that your connector is the same, you can probe at the transmission connector in the engine bay (as also suggested). Check for resistance of 11-15 ohms at the circled pins and if you find that I think G (yellow) is reading infinity, your solenoid is toast. When I probed mine I put my negative lead straight to the battery negative.

I also bought the kit from eBay that lawsoncl linked and have not had an issue with it in currently around 6 months.

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May 19, 2019 | 09:49 AM
  #6  
I stole your photo Boxburn
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May 19, 2019 | 09:53 AM
  #7  
Quote: I stole your photo Boxburn
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May 21, 2019 | 04:38 PM
  #8  
Thanks for the information and links!

Ive got the set of solenoids with filter and pan gasket on order.

It's working sometimes now, but still starts in 3rd or 4th sometimes.

I read on the earlier Cherokees that they have a fuse for the transmission.

But looking through my owners manual, it shows nothing about a trans-fuse.

Is that just on earlier models???
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May 21, 2019 | 04:51 PM
  #9  
I can't say for sure but I doubt it's only on the earlier models. On my '95 FSM it shows a permanent live on Fuse 2 and an ignition live on Fuse 12 both in the PDC (under the bonnet). If you haven't already, download the '97 FSM from Cruisers' website as it may show you more than an owners manual.
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May 21, 2019 | 08:55 PM
  #10  
Quote: I read on the earlier Cherokees that they have a fuse for the transmission.

But looking through my owners manual, it shows nothing about a trans-fuse.

Is that just on earlier models???
Earlier model had a fuse wrapped up in the wiring harness near the trans computer. Really stupid design in my opinion.
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May 21, 2019 | 09:45 PM
  #11  
Quote: Earlier model had a fuse wrapped up in the wiring harness near the trans computer. Really stupid design in my opinion.
That was the power for the TCU. The fuse holder became corroded and caused issues.

The fuse in the fusebox of the 90 and prior models was for the NSS reverse light circuit.
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