At first I thought my transmission was gonna go...

The symptoms were, the transmission slipping and shifting up at 3,500 rpms, 5 second delay when shifting into reverse, and problems with downshifting while uphill.

I have always thought the previous owner had abused the transmission and caused the friction pads to be "worn out".

Then I was searching in here about options of rebuilding or whatever etc.

I saw one thread about problems with the transmission that sounded same as mine, so I read it, I was amazed to learn that the possibility that the fault is not to be blamed on the transmission.

Apparently throttle position sensor is possibly the culprit.

First thing I did, was to adjust and reset the TV cable and the transmission still performed the same.

Then I read about testing and trouble shooting the TPS.

The left wire is ground, so it read zero. The middle one read at 4.3 volts, and the right wire read at 5.5 volts, even with the key in ignition but not started.

I tried to moving the throttle valve and it went backwards... The middle wire went down to 3.2-3.4 volts when the throttle is fully open. I read that when its closed, it was supposed to be at .5 volts and when it's fully open, it was supposed to read at around 5 volts.
I found that interesting, then when I decided to stop working on the Cherokee, I went to start it up and saw that the check engine light was on, so I drove to advance auto to check the codes.

P0122 and P0123 was what I got...

Both codes point to the TPS as a culprit.

I have yet to buy the new one because frankly, I'm broke lol.
I hope when I replace the TPS, the transmission would be back to normal and give me back my MPGs lol.


I'm wondering if any one of you had similar experiences? What did u do, how did u check, etc etc.

 

Just ordered a TPS from eBay. Hope it solve my problems

 

Has the plug or wiring been chopped up? Here what you should have:

 

All wires are good. No visible damage

 

Did you ever get this resolved?