My 89 started acting funny today. My wife drove it home from work and it was running fine. She made a stop at my moms and when she left the jeep didnt want to go at first but then got moving. She got home and i checked a few things as soon as she pulled in the driveway. The fluid was normal temp and pink still with no burnt smell or anything. And read where it should on the dip stick. The tv cable was still adjusted properly. When i put the shifter in drive it acts really slow to get up to speed. Doesnt really feel like slipping though. It still grabs just not like it should. If i put it in R, 1-2. It acts normal. Takes off just fine. Any ideas before i go get boned at the tranny shop? I just finished my project with it after 8 years and this is a real bummer. It sat for a long time while working on it and ive only had it back driving for a month or so. I dont really know too much about trans problems but would really like to fix it myself to say i did. KOH is this week and i dont want to miss it. Thanks in advance.
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AW4 problems
- Thread starter bails85
- Start date
bigdaddyjlove
NAXJA Forum User
- Location
- Atalanta
Trans position sensor? I've had one go out, and the jeep tried to take off in third gear.
- Location
- Minneapolis, MN
Confirm your AW-4 is filled with Dexron-III/Mercon fluid.
Unplug the Transmission Control Unit (TCU) and go for a test drive. Shifting manually 1-2-3-D, if seems to shift normally each time, you should suspect a faulty transmission solenoid or a faulty TCU. The NSS does have input for shifting, and could be misadjusted or faulty also.
Unplug the Transmission Control Unit (TCU) and go for a test drive. Shifting manually 1-2-3-D, if seems to shift normally each time, you should suspect a faulty transmission solenoid or a faulty TCU. The NSS does have input for shifting, and could be misadjusted or faulty also.
cruiser54
NAXJA Forum User
- Location
- Prescott, Az
Could be as simple as a corroded fuse at the TCU below the glovebox.
Look for the yellow harness.
Look for the yellow harness.
- Location
- Southern Maryland
Do you feel it shifting through the gears? The floor shifter limits the trans to the specified gear, the TCU works the gears and torque lockup. If you put it in D and the TCU is disabled then it will start in 4th, and won't take off like normal (but it will go).
If you feel it working through the gears, then clutch engagement is weak. Possibly a stuck solenoid, worn clutches, or something along those lines.
If you feel it working through the gears, then clutch engagement is weak. Possibly a stuck solenoid, worn clutches, or something along those lines.
- Location
- annapolis, md
how many miles on the tranny ? my 98 & my brothers 98 both at about 140-150 k needed the solenoids replaced, had similiar syptoms of not wanting to go , i could manually shift it , but coudnt just leave it in drive. would come to a stop it stayed in 3rd , wouldnt down shift on its own. changed out all 3 soles. works like new, did it 4 yrs ago, still works great.
- Location
- In the islands
I too had the same problem several years ago and resolved it by replacing all the solenoids. I bought the replacements from an outfit in Texas (I do not remember the name) who specializes in the A340 which is the Toyota counterpart to our AW4.
Here is a start. http://www.naxja.net/forum/showthread.php?t=1013956
Cruiser i could kiss you. That was the problem. Thank you all for your help. My boys are gonna love koh
lawsoncl
NAXJA Forum User
- Location
- North Idaho
The trans computer is attached to the back side of the dash kickpanel below the glove box. As bizarre as it seems, yes there is a standard ATO auto-style fuse in the wiring harness (red 10-amp I think?), as well as a small resistor that's taped up in the harness for the brake switch. The 7.5-amp fuse in the fusebox labelled trans doesn't actually feed the trans computer, it feeds mostly the NSS and the backup lights.
techno1154 said:
Excellent place to start if you have a multimeter. You can reach up under the dash and unplug the TCU connector to check the solenoid resistance, power to the trans computer, etc.
Popped fuse would be the easiest fix. A bad solenoid would be the next most likely. Last time I priced solenoids, it was under $150 for the full set and maybe a two hour job to drop the pan and replace them. It's probably not a mechanical problem if it's shifting okay manually.
cruiser54
NAXJA Forum User
- Location
- Prescott, Az
It's super common. Was the fuse corroded or blown?
Blown
cruiser54
NAXJA Forum User
- Location
- Prescott, Az
It will probably be just fine, but you probably oughta do Tip 10 at www.cruiser54.com and report back your findings.
I have slowly been making my way down your list
cruiser54
NAXJA Forum User
- Location
- Prescott, Az
Well, shift into high gear and get them done!! Pun intended.
They take no time at all.
cruiser54
NAXJA Forum User
- Location
- Prescott, Az
The fuse up under the passenger side dash near the TCU is the one that blows?
After consulting a wiring diagram, I would suspect the TCU is the issue.
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