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  #1  
Old October 21st, 2019, 13:35
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cherokeecrawler cherokeecrawler is offline
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Possible AW4 Issue??

I'm having a problem with my AW4. Everything is stock other than suspension, exhaust and intake. Problem arises when I'm in overdrive going up a steep incline and it doesn't have enough power but it absolutely refuses to downshift, it's stayed in 4th till it slowed to 30 before... Only way it will downshift is if I completely lift and get back on it. Is this factory or is something messed up?

Thanks, Aidan.
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  #2  
Old October 21st, 2019, 16:39
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Rob Mayercik Rob Mayercik is offline
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Re: Possible AW4 Issue??

What year? Sounds like a mis-adjusted kickdown (Throttle Valve) cable, but knowing the year would help.
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  #3  
Old October 21st, 2019, 20:35
lawsoncl lawsoncl is offline
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Re: Possible AW4 Issue??

Adjust the throttle-trans cable (often incorrectly referred to as a kickdown cable, since it doesn't control when to shift). The most likely culprit is the Throttle Position Sensor (TPS).
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  #4  
Old October 22nd, 2019, 06:57
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Re: Possible AW4 Issue??

http://cruiser54.com/?p=58
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  #5  
Old October 22nd, 2019, 13:19
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cherokeecrawler cherokeecrawler is offline
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Re: Possible AW4 Issue??

Sorry, should have probably included that in there. It's a '99 sport 4wd. The CEL did come on a few months ago for the TPS after a wheeling trip, but I cleared it and it never came back on. How do you adjust the throttle-trans cable?
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  #6  
Old October 22nd, 2019, 22:06
lawsoncl lawsoncl is offline
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Re: Possible AW4 Issue??

Quote:
Originally Posted by cherokeecrawler View Post
Sorry, should have probably included that in there. It's a '99 sport 4wd. The CEL did come on a few months ago for the TPS after a wheeling trip, but I cleared it and it never came back on. How do you adjust the throttle-trans cable?

No code doesn't mean the TPS isn't bad. Test it and replace if necessary.
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  #7  
Old October 23rd, 2019, 04:57
Down under Down under is offline
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Re: Possible AW4 Issue??

I'm a bit lost....
What are you doing in O.D going up a steep hill for?
Sounds like a totally wrong ratio s election !
Am I missing something I do not not understand?
Even with any auto you are better off selecting the right rangge and holding it in the appropriate revs correctly.
Wheel/tyre overall diameter has as lot to do with sync of ratio/ labouring I believe
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  #8  
Old October 23rd, 2019, 09:38
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cherokeecrawler cherokeecrawler is offline
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Re: Possible AW4 Issue??

It has 32s and stock gearing. I usually just put it in drive and it shifts to OD once i hit 43ish. I live in North Ga so there's a lot of curvy back roads and hills so 3rd and OD is where i due most of my driving. It does just fine on most but there's a few hills that just kill it near my house, I can be cruising right along in OD and then it'll start slowing down due to not enough power but it wont down shift. I either have to completely lift or give it enough gas to where it jumps up to 3500 on the tac and takes off. Its quite annoying as 1st, 2nd and 3rd down shift just fine. I'm happy with the gearing offroad and I don't plan on getting a bigger tire anytime soon so re-gearing just to fix OD seems a little unnecessary. If i wanted to manually shift it i'd put an ax15 in, just want my auto to due it's job correctly ya know?

I'll check the TPS connectors as yall pointed out when I get home. Thanks again.
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  #9  
Old October 23rd, 2019, 09:51
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Re: Possible AW4 Issue??

Also I didn't put the correct speedo gear sensor so at 40mph I'm actually doing about 44mph. Not sure if that's related or not.
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  #10  
Old October 23rd, 2019, 10:08
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Re: Possible AW4 Issue??

You definitely need to correct the speed reported to the PCM and TCM. They both depend on the reported speed to select the correct gear.

32 inch tires and 3.55 gears are a no, no for the XJ with the AW4 in hilly country. My XJ also have 32 inch but 4.10 gears. I do not see how you manage to drive up (steep) hills with the 4.0L and AW4 in supposedly in 4th and OD.
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  #11  
Old October 23rd, 2019, 12:06
SlowXj SlowXj is offline
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Possible AW4 Issue??

My 96 xj 4.0 aw4 np321 ran around 7 years with no speedometer or odometer. Cable got ripped out. It didn't affect how it shifted at all. Like the op though it has always wanted to stay in od unless you mash the gas or lift and reapply the gas. It was like this before, during, and after the speedo was fixed. And that also ranges from about 150k to 300k miles guessing... The TV cable has been adjusted multiple times the correct way with no change. I just got use to this condition lol

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  #12  
Old October 23rd, 2019, 20:32
lawsoncl lawsoncl is offline
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Re: Possible AW4 Issue??

Quote:
Originally Posted by techno1154 View Post
You definitely need to correct the speed reported to the PCM and TCM. They both depend on the reported speed to select the correct gear.

Nope. The TCM only measures the output speed of the transmission using the output speed sensor. If does not connect to the speedo in the xfer case..
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  #13  
Old October 25th, 2019, 10:00
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Re: Possible AW4 Issue??

Adjusted the throttle-trans cable at lunch today(the right way too), still didn't make a difference. More than likely gonna need a TPS as yall said. And I didn't think the speedo sensor mattered since I've seen xjs run fine with a broken speedo but wasn't sure.
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  #14  
Old October 25th, 2019, 10:12
lawsoncl lawsoncl is offline
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Re: Possible AW4 Issue??

If you have a meter, the TPS is pretty easy to test. A cheap meter is under $5 at harbor freight, or sometimes even free with a coupon.

Plenty of how-to videos on testing. https://www.youtube.com/watch?v=URNYaGXM_uQ
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