Originally Posted by DermJeep
Help! Ghost in the 2.5L machine!?!
So I've been getting a P0122 code and a MIL, and have gone through the following troubleshooting steps:
- verified properly functioning TPS - getting 5.12V reference voltage at sensor, getting signal output within spec at all throttle positions with no dead spots in the range
- verified ground continuity at the sensor, and as far back in the wiring harness as I can go
- replaced connector and wiring pigtails
- cleaned battery terminals and verified voltage into ECM
- replaced the TPS twice just to make sure (thanks warranty!)
- removed and cleaned the throttle body, MAP sensor pickup tube, IAC housing and sensor
- lubricated throttle cable (this wasn't an issue)
- had a professional mechanic friend run a diagnostic scan to get some data monitoring - ECM showing good voltage input from the TPS
The damn thing is still throwing the code, and I still get a hiccup in acceleration - worse between 1200-2200 rpm, but still there at full throttle.
What am I missing?!?
i got the same thing that you got except mine threw the code PO123 but i experience the same symptoms you are i would hiccup at exactly 2000rpm, my solution was the clockspring behind my steering wheel that connects to your airbag and horn and cruise (if you have it). remove the lower steering column behind the steering wheel held together by two screws, once you remove the lower column it should look like this:
remove that white plug dont touch the yellow one thats your airbag, once that white plug is disconnected be aware that you cannnot use your horn or cruise control. take your jeep out for a spin if it is back to normal then you need a new clockspring