My 95 Cherokee shifts at over 4000 rpm. This happened after I replaced several components that may have not been necessary. MAP sensor, Idle Control motor and Throttle Position Sensor twice due to a high idle of 2000 rpm. Now it idles fine at 750, but shifts at really high rpm. I cleaned the ground terminals behind the dipstick, and battery, but they were not corroded. So the check engine light came on too and I think it is a low voltage code but not sure if Im reading it right. The ground from the block to firewall looks ok but a little obscured. This is a Right hand drive got a couple years ago and has around 130000 now. Runs about 200 miles a day so really need to figure it out. Will probably put another ground cable to see if that does it. Does that help resole a low voltage problem as well

 

There is a cable (TV cable) that runs from the throttle body down to the transmission, first check that it's correctly adjusted. Next, do you have the Comfort/Power switch on your dash panel? If you do, switch it to comfort. Power mode shouldn't hold it in gear much higher than comfort in normal driving but worth trying.

 

Tried cable adjustment, no dice. No dif between comfort and power settings. Added 2 more ground points. It ides and accelerates fine. CEL comes on every time, even when the battery is disconnected. Sent a video of the code it puts out when you turn switch on and off 3 times. Thinking it is a tcu, solenoid or bad tranny

 

didnt put the video here

 

I've been down this road. Get a Mopar TPS. I don't know why nobody makes a decent aftermarket sensor for this engine, but it matters. The TPS, CPS, and O2 are the most finicky sensors that have to be Mopar (or NTK for the O2). Period. I'm telling you from experience. I rebuilt my transmission, did a Transgo HD2 shift kit, adjusted the cable 100 times, replaced the solenoids, replaced the cable, everything. I installed a USED TPS from the junkyard on a whim and it started working like new. That's when I bought a new Mopar TPS. Couldn't believe it.

 

Thanks buddy. I was fixing to go with expensive repairs. Will definitely try this first.

 

The Mopar Genuine is hard to find, found one on ebay

 

The damndest part is that my old TPS tested fine. Voltages at the ECU were in band, and I checked it with a Simpson 260 analog ohmmeter for dead spots. It was just a whim that I happened to grab a TPS while I was there and tried it out. I about lost my mind when I drove it the first time after putting it on.

 

What a Nightmare. I kept the original TPS, put it back on there, works perfect. So much havoc from one part. When I cleaned the plenum, added 2 new ground points, and cleaned the others, it solved the voltage issues, so the original TPS was not even bad. Boy your advice really saved me. Thank you very much!!!