help asap

[jeeptree]

i got a proplem with my tranny its not getting out of 1#, i check the fluid and it was dry but when i check again it was fine. i put some more fluid in just in case but nothing. its still in 1 its not shifting at all. this all came out of no where, i was just drive with my girl and came to a stop when i went to take off it would go past 1#.

[langer1]

You do know you check it with the engine running, right?

[jeeptree]

yeah it was running the first time i checked it was dry. i mean dry then i went like to miles to get home shut off the truck and let it cool down then i started it again the fluid was fine. but thank you that would have been nice if that was it. oh and its a 93 xj, i did say that in my post.

[CantonXJ]

Check your TPS.

Dave

[jeeptree]

tps??? ok what is that. and where is that

[CantonXJ]

The Throttle Position Sensor is located on the throttle body. Many AW4 (your transmission) problems can be linked to this sensor. Also, I believe there is a speed sensor on the trans itself. This, along with the TPS, sends signals to the TCU (Transmission Control Unit) which in turn tells the tranny when to shift.

Dave

[SanDiegoXJ]

throttle position sensor...and it's one of the sensors on the back of the throttle body, closest to the brake booster.

You might also try unplugging the transmission control module to see if you can shift manually...that should isolate an electrical problem from a mechanical problem. If it don't work with the computer, but it works without it, you know its a computer control related issue...either the TCM (Transmission Control Module), TPS (Throttle Position Sensor), or VSS (Vehicle Speed Sensor). From all I've read, those are basically the only 3 things that are involved in the computer control. It also seems that the TCM rarely goes out...which is good, because its hella expensive. The TPS and VSS are more moderately priced items, about $40-50 each.

But before you rush out and start dropping cash on items that aren't bad, I'd try to eliminate what I could first, hence the suggestion to unplug the TCM. It should be located up on the drivers side dash, just under the steering column, attached to the medal housing that holds the bottom dash panels....just unplug the connector and see if the Jeep will shift manually as it will no longer shift via computer. Without a comp, you should be able to force the tranny to shift from 1 -> 3 -> 4 (Overdrive). If that works,you can check the sensors with an ohm meter to locate which part is faulty.

[jeeptree]

thank you all il try it that was good advice. il tell you if it works.

[jeeptree]

yeah so i unplugged just about everything under my dash and not one was for the tranny. is there anywhere else the tcm could be?

[langer1]

Your should be right under the glove box on the passenger side.

[Yucca-Man]

Right about here:
http://yuccaman.com/jeep/pics/tcm.jpg

To check the proper tranny fluid level, the engine should be warm and run through the gears (if at all possible). Park on a level surface, and leave the engine running while the tranny is in Neutral. Apply the emergency brake and/or block the tires.

[jeeptree]

i didnt check there, i know thats where my ecu was in my 240sx. thank you il let you know tomarrow.

[jeeptree]

thank you that helps out more then you know im at church right now but when i get home thats what il try and i will let all you know asap what i find out. is there anything else i should try after that?

[langer1]

You should pray to the Jeep God first.

[jeeptree]

theres only one God i pray to and i think He can fix more then a jeep but thats just my God.

[jeeptree]

hey laner1 once i get this thing fixed my girl lives in canton if you're around there we can meet up and hit the trails.

[langer1]

About 20 miles south in the boondocks.

[SanDiegoXJ]

'tis possible that its under the glove box, but mine was on the drivers side (1994 Cherokee Country). I will say tho, I had a hell of a time finding it the first time. I ended up taking off the entire underside of the dash, at which point enough light finally came through to let me locate it while lying upside down with my head mashed against the brake pedal.

So if you look under the dash and still don't find it, keep looking! It's just a little silver box, about 3"x3" as I recall. One screw mounting it to the dash, and one plug coming out of it (at least thats what the unit on mine looked like). I believe the plug has about 10 or so wires going to it to...its a fairly significant cable.

[jeeptree]

i think thats the one i unpluged but the only thing it did was turn my head lights off? was it more to the tranny hump or to the door. the thing i unpluged was more to the door it was silver and it was 3" by 3" with about 10 wires comeing out and like i said all it did was trun my light off. im lost?


langer1 i will look you up and pm you some time im down there. Is there any good trails down there

[langer1]

i think thats the one i unpluged but the only thing it did was turn my head lights off? was it more to the tranny hump or to the door. the thing i unpluged was more to the door it was silver and it was 3" by 3" with about 10 wires comeing out and like i said all it did was trun my light off. im lost?


langer1 i will look you up and pm you some time im down there. Is there any good trails down there
The one you unplugged was the headlight timer, Yes we got trails.

[lilredwagn]

If you have a manual transmission, now would be a good time to share that info ;)

It's about 4.5x6.5x2, so it's pretty hard to miss

http://img205.imageshack.us/img205/695/tcmcu0.jpg (http://imageshack.us)

[langer1]

http://jeep.avtograd.ru/Cherokee/transmission/AW4/images/TCU_location.gif

[SanDiegoXJ]

bah....mebbe I need to stop drinking beer when reading the FSM =(

Oddly enough, when I cleaned the corroded connection on that little box on the drivers side, my shifting issues went away

[jeeptree]

i found the tcu. when i unpluged it, i could shift "yes!" that was last night. im looking at some junk yards today for a tps. im going to clean the tcu first like sandiegoxj said,when i get out of work. and i was wondering is it ok to drive with out useing the tcu and manualy shifting. if so why cant i do this to keep it in 1# when im in 4lo? i know thats a little of topic but i am driveing it to work witch is 15miles.

[langer1]

Yes it's ok to drive that way.

[jeeptree]

thank you all for your help. i would still be lost. but im on the right trail now :rof: . What should a tps cost$$$ any idea im going to get a couple from a yard to see it thats what it is then im going to the zone to get a good one

[SanDiegoXJ]

Mine cost about $50 but from autozone. But personally, I prefer putting mopar parts back in the computer system. I've purchased too many sensors from autozone that didn't work quite right from the get go.

I don't know how big of a rush you're in, but you can check your local Jeep dealership...if it's not outrageously high, get it there. Or if you can wait a couple days, you can try here (www.chryslerpartsdirect.com) They have a Mopar TPS listed for $44.28, suggested retail price $54.00.

No clue what it would be from a junkyard, I would guess under $20 tho. And some of the TPS's are slightly different. I'm not sure what year they changed, but up until 1990 or 1991 (I think) they had adjustable TPS's. Ours aren't adjustable to the best of my knowledge and I don't think the parts are interchangeable.

[langer1]

I would not jump on a TPS, I doubt it's your problem because with your year the engine also uses the same TPS signals. If you engines running good your TPS is fine.
You know now it's electrical so it COULD be.
Speed sensor.
TCU.
Range selector.
A bad Solenoid.
Just a fuse to the range selector.

[SanDiegoXJ]

Hehe, oh yeah, you can check the TPS with an ohm meter as well, I believe. I don't have the FSM with me at work, but I'll check it out when I get home and see what it says. I know you can check the TCM with an ohm meter, the instructions are on the web. I'm not sure what the range selector is, but I'll check that at home as well and see if it has any functionality tests in the FSM too. The solenoids also have an ohm meter test for functionality. So, you can pretty much go from part to part and see which is faulty before you rush out and blow change on a part ya don't need.

Oh, and to reference you're idea about why can't you do this to keep the vehicle in 1st gear 4-lo while wheeling...you can! But better yet, some guy on this forum has this nifty keen setup for the AW-4 that will give you manual control at the flick of a switch. Then before you hit pavement, one more flick of the switch pops you back into fully auto... I think the link is www.awshifting.com (http://www.awshifting.com)

[RichP]

'tis possible that its under the glove box, but mine was on the drivers side (1994 Cherokee Country). I will say tho, I had a hell of a time finding it the first time. I ended up taking off the entire underside of the dash, at which point enough light finally came through to let me locate it while lying upside down with my head mashed against the brake pedal.

They make these new fangled gadgets that have about 20ft of orange wire on them with a shiny sliver end that holds a bulb, very handy to have around when fishing in the dark. :D :D :D

[jeeptree]

well my engine is not running right eather its only 250rpm to 500 rpm when at idol and is "jumpy" thats why i think its the tps. but that dont make me right nither like i said any input will help. thank you

[SanDiegoXJ]

heh, well that could be the IAC valve as well =) [Idle Air Control Valve] That's the other sensor on the throttle body...but that wouldn't affect your shifting I don't believe. You might consider popping it off and cleaning it out tho...generally a good cleaning is enough to get it working again.

[jeeptree]

hey i just wanted to say thank you all for helping me and to tell you that it was my tps after all! its runs like a champ. i even had time to put in my new cb last night. $15 bucks for a tps out of a yard. not bad and i got a price for a new one, from Advance Auto (http://www.advanceautoparts.com/) 41.99 thats less then i thought it would be. once again thank you. and i hope to be posting on here about a lift or tires next time. ;)

[RichP]

hey i just wanted to say thank you all for helping me and to tell you that it was my tps after all! its runs like a champ. i even had time to put in my new cb last night. $15 bucks for a tps out of a yard. not bad and i got a price for a new one, from Advance Auto (http://www.advanceautoparts.com/) 41.99 thats less then i thought it would be. once again thank you. and i hope to be posting on here about a lift or tires next time. ;)

Think maybe we saved you 2 or 3 times the price of getting your name in RED:laugh3: :laugh3:

[jeeptree]

yeah i think so to!