i was driving my 90 jeep cherokee yesterday drove it around all day it ran fine went to go somewhere else and it wouldnt shift out of frist gear it just keeps incresing in rpms it shifts to netural and park just fine i didnt see anything leaking when i crawled under neath it

 

Not sure if that tranny has shift selonoids or not. (not sure on that spelling) also it may be a worn out adjustment belt. My old ZJ started having a lot of trouble gettin out of first gear, i had the belts adjusted and it worked fine till my ex wife killed it hitting bambi.

 

im pretty shure theres no shift solonoide i didnt see onb listed on the computer

 

Google tps adjustment.. It'll be on a site lunghd.com or something

 

A '90 XJ auto is an Aisin Warner 4 trans. All AW4s are controlled by solenoids. First thing's first though, check your fluid, while idling in park. Is it full? What color is it? Is it burnt (if you know what burnt trans fluid smells like)?

Yeah, most 4.0 ZJs had the 42RE Chrysler trans, which does have bands.

 

the trans fulid is full and its not burnt i know that much the jeep was just put back on the road after sitting since august and its been driven probaly 3 or 400 miles

 

Check your TPS using the trans side as described in the following write-up.


RENIX TPS ADJUSTMENT
Before attempting to adjust your TPS be sure the throttle body has been recently cleaned. It's especially important that the edges of the throttle butterfly are free of any carbon build-up.
IMPORTANT NOTE: Using the positive (red) lead of your ohmmeter, probe the B terminal of the flat 3 wire connector of the TPS. The letters are embossed on the connector itself. Touch the black lead of your meter to the negative battery post. Wiggle the wiring harness where it parallels the valve cover and also over near the MAP sensor on the firewall. If you see more than 1 ohm of resistance, or fluctuation in your ohms reading, some modifications to the sensor ground harness will be necessary. The harness repair must be performed before proceeding. I can provide an instruction sheet for that if needed.
MANUAL TRANSMISSION: RENIX manual transmission equipped XJs have a three-wire TPS mounted on the throttle body. This manual transmission vehicle TPS provides data input to the ECU. The manual transmission TPS has three wires in the connector and they're clearly embossed with the letters A, B, and C. Wire "A" is positive. Wire "B" is ground. Key ON, measure voltage from "A" positive to "B" ground by back-probing the connectors. Note the voltage reading--this is your REFERENCE voltage. Key ON, back-probe the connector at wires "B" and "C". Measure the voltage. This is your OUTPUT voltage. Your OUTPUT voltage needs to be seventeen percent of your REFERENCE voltage. For example: 4.82 volts X .17=.82 volts. Adjust the TPS until you
have achieved this percentage. If you can't achieve the correct output voltage replace the TPS and start over.
AUTOMATIC TRANSMISSION: RENIX automatic transmission equipped XJs has a TPS with two connectors. There is a flat three-wire connector, same as the manual transmission vehicles have, and it is tested the same as the manual transmission equipped vehicles—
FOR ENGINE MANAGEMENT RELATED ISSUES. However, the automatic TPS also has a square four-wire connector clearly embossed with the letters A,B,C, and D. It only uses three wires and provides information to the Transmission Control Module. Key ON, measure voltage between "A" positive and "D" ground. Note the voltage. This is your REFERENCE voltage. Back-probe the connector at wires "B" and "D". Measure the voltage. This is your OUTPUT voltage. Your OUTPUT voltage needs to be eighty-three percent of your REFERENCE voltage. For example 4.8 volts X .83=3.98 volts. Adjust the TPS until you have achieved this percentage. If you can't, replace the TPS and start over. So, if you have an automatic equipped XJ your TPS has two sides--one side feeds the ECU, and the other side feeds the TCU.
If you have TRANSMISSION issues check the four-wire connector side of the TPS.
If you have ENGINE issues check the three-wire connector side of the TPS. For those with a MANUAL TRANSMISSION--the TPS for the manual transmission XJs is stupid expensive. You can substitute the automatic transmission TPS which is reasonably priced.
Revised 04-08-2012

 

In that case it does sound like a solenoid or Trans Control Unit issue. Though it could be the TPS cable like 93XJLI and cruiser54 said, that'd be a pretty simple place to start. After that check for a fuse in the wiring loom on the TCU, should be behind the dash panel on passenger side, there's a 10amp fuse somewhere in there. If you exhaust these methods with no results you can test the solenoids via the TCU wiring harness if you have a multimeter/ohmmeter. Anyways, is there any additional info at all? It's odd that it drove totally fine then just buggered itself up by sitting for a couple hours.

 

If there is too much tranny fluid in it then it wont shift maybe you have too much?

 

under the glove is the trans computer it has 1 10a in line fuse pull the fuse, and try to shift it manually. mine has been like this for at least a year it will get you around until you change the shift solenoids

 

I do a lot of highway driving and recently it seems my 2007 Jeep GC CRD is having problems automatically shifting. I'll be driving high speeds then when I am slowing down to then increase acceleration again, my RPM shift way up but the jeep does not jump into gear? It does a lot of revving then jerks into gear. Seems to be getting worse over these past few days. Stalls at about 2000rpm. We bought an OBD reader today so hopefully tonight we can figure out if theres an obvious problem. Trying to avoid dealerships! Any advice on this? I would appreciate help as I have only had vehicle few months!

 

Welcome, but you're in the wrong forum. Try the Grand Cherokee forum.

 

check the solenoids in the trans pan, i just replaced mine and that fixed all my trans problems, she's good now, FOR NOW!!!!!