91 Xj Transmission issues / concerns
#16
If it's still a light pink then I doubt a drain and fill will help. It sounds like someone may have already tried that, or actually took decent care of it. 95% of the transmissions I've seen do not have clean pink fluid if there is a problem with them. I'm hopeful it will help, but like I said I doubt it will. Also, try what Steve said about trying different gears.
#20
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Year: 1996
Model: Cherokee (XJ)
Engine: 4.Slow
Also OP, there is a TCU (Transmission Control Module) located under the passenger side dashboard and a NSS (Neutral Saftey Switch) located on the passenger side of transmission. These two controls help determine what gear the transmission should be in. We will also be checking the TV (Throttle Valve) cable as well. There is a write up here on cleaning/repairing the NSS. Try cleaning that then check for original problem. If original problem still exists after, we will then move to diagnosing the TCU and adjusting the TV cable.
So in recap, fluid is in check, now clean NSS and report back with results.
So in recap, fluid is in check, now clean NSS and report back with results.
#21
After you do the flush get back to us. The aw4 is an electronically controlled transmission . However as you stated everything is fine once it's up to temp. Which would mean it working properly at that time. Usually an electrical problem is not temperature controlled. And/or can happen at any given time or clear up at any given time. Or just don't work period and consistently does not work.
If it's consistent in the scenario you originally described I would bet a mechanical problem rather than electrical. And as usual I hope for your sake I am wrong.
Last edited by holycaveman; 10-24-2014 at 11:35 AM.
#22
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Year: 1996
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It sounds like you are not building pressure until the fluid gets warm. This usually is a problem with older hard seals inside the transmission.
After you do the flush get back to us. The aw4 is an electronically controlled transmission . However as you stated everything is fine once it's up to temp. Which would mean it working properly at that time. Usually an electrical problem is not temperature controlled. And/or can happen at any given time or clear up at any given time. Or just don't work period and consistently does not work.
If it's consistent in the scenario you originally described I would bet a mechanical problem rather than electrical. And as usual I hope for your sake I am wrong.
After you do the flush get back to us. The aw4 is an electronically controlled transmission . However as you stated everything is fine once it's up to temp. Which would mean it working properly at that time. Usually an electrical problem is not temperature controlled. And/or can happen at any given time or clear up at any given time. Or just don't work period and consistently does not work.
If it's consistent in the scenario you originally described I would bet a mechanical problem rather than electrical. And as usual I hope for your sake I am wrong.
#23
I meant what it sounds like.
You can also bypass the tcu completely and check the transmission for a mechanical related problem. Remove the fuse or unplug the tcu. Drive (3rd)will act as 3rd only with no slippage. 1-2 will be first only with no slippage. If you have slippage with the tcu disconnected then it's a mechanical problem normally.
But i still would suggest a fluid change first. Making certain the fluid level is checked in neutral while running.
Last edited by holycaveman; 10-24-2014 at 12:37 PM.
#24
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Year: 1991
Model: Cherokee
Engine: 4.0 HO
What is the connection to the NSS in this situation? Isnt it only on start up that its a big factor or does it work further with the transmission to engage into certain gears once the jeeps running??
#26
The nss works with the speed sensors and the tps, through the tcu to tell the transmission when to shift.
Since you are slipping at startup I would point the blame elsewhere. As the electronic control mainly effects 1-2, 2-3 shifts and not start up. But you never want to completely rule out electrical problems. Especially if you are trying to communicate through the internet. LOL
Edited 8)
Since you are slipping at startup I would point the blame elsewhere. As the electronic control mainly effects 1-2, 2-3 shifts and not start up. But you never want to completely rule out electrical problems. Especially if you are trying to communicate through the internet. LOL
Edited 8)
#29
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The nss works with the speed sensors and the tps, through the tcu to tell the transmission when to shift.
Since you are slipping at startup I would point the blame elsewhere. As the electronic control mainly effects 1-2, 2-3 shifts and not start up. But you never want to completely rule out electrical problems. Especially if you are trying to communicate through the internet. LOL
Edited 8)
Since you are slipping at startup I would point the blame elsewhere. As the electronic control mainly effects 1-2, 2-3 shifts and not start up. But you never want to completely rule out electrical problems. Especially if you are trying to communicate through the internet. LOL
Edited 8)
There are about 4 things that control your gears and shifting on the AW4. Having a brief understanding of how all these things work and how they work in conjunction with each other will help you to figure out where certain problems may lie.
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