xjnm

Update on this issue:
I have still not fixed it. The jeep shows no codes.

The main new thing is that I have determined that it isn't third gear that's the problem, but rather the downshifting sequence that the cherokee does. When I'm in "D", it shifts from 4th straight to 2nd. When I am in "3", it shifts from 3rd to 1st and skips 2nd. So, nothing wrong with shift solenoids or transmission mechanical.

I am starting to suspect something with the TV cable. Of course I've adjusted it multiple times but this issue really seems tied to throttle position and how the transmission interprets it.

Again any info at all would be really helpful. It would also help if anyone can explain to me what the TV cable actually does in relation to the transmission shifting.

As always, thanks a lot!

cruiser54

TV means Throttle valve.It increases internal trans fluid pressure depending on throttle position. So, softer shifts at light throttle and harder under a larger throttle load. Not what you're experiencing. the solenoids can be checked from that connector highlighted in my post above.

xjnm

Thanks for the response. That is useful to hear. My shift solenoids are new, and like I described I don't think they could be the problem anyway.

xjnm

is there any other way that the transmission gets info about throttle location or RPMs besides the TPS?

cruiser54

Not that I know of.

xjnm

Ok well thanks for your help. If you can think of anything else that could be causing this let me know. Tomorrow I'm going over all electrical connections for a second time.

xjnm

https://www.cherokeeforum.com/f2/tra...r-load-136322/

My symptoms are exactly like this guy's. So maybe it is the TC lockup solenoid? That is the one I did no replace. Any info on how to test that one for a 98?

xjnm

Found some info. Tc will lock up in 4th with shifter in D and in 3rd with shifter in 3. This is consistent with my problems.

Shift Solenoid testing for a 97-01 located in CCken's post #10 in this thread:

https://www.cherokeeforum.com/f2/cod...lenoid-189744/

I'm going to test the solenoid tomorrow and see if it needs replacing, as well as look at wires coming from the trans.

xjnm

I tested the solenoids. All read 12 ohms. Pin #24 is a full short to ground, so all that is good. All my trans wiring looks good. I am now suspecting maybe a dead spot in one of the input output speed sensors, because those are how the cherokee knows what gear it's in and also partially what gear to shift into. I'll post results. As always, any input is appreciated!

Edit: I think the torque converter staying locked is a symptom, not the cause of the problem.

thorguy57

lawsoncl

They don't get deadspots, they generally either work or they don't. If you had a problem with either the input or output speed sensor, it would throw a code, either one for a bad sensor or erroneously a bad shift solenoid (i.e. it would know it was commanding a particular gear, and the in/out ratio looked wrong).

xjnm

I am located in northern NM. Could you elaborate on what you mean by a valve body issue? I am fairly certain that it is not an issue with the transmission internally because it can stay in and shift to each gear fine when I do it manually. Also, do you mean that there are two power wires that go to the tcm?
thanks!

xjnm

thanks. Are you absolutely sure about this? For example, if the speed sensor was a variable resistor of some sort, it could easily get a dead spot.

thorguy57

thorguy57

For some reason my pics aren’t showing up