Guys, I need an advise - I'm outta ideas
I've Elantra 2002 GT.
My idle rpm was jumping from 1500 to 3000, and later on it stays at 4000 a moment I turn the car on (doesn't matter hot or cold). I got a Memoscan tool and it showed the p0121 problem. Right away I bought a new TP sensor and installed it. But nothing changed. I don't remember where, but on this forum, I found a doc file named "TPS.doc" which says how to test TPS and harness. After testing I found that even my old TPS was good. All the measurements were in the norm, but I noticed that in this doc file the pin names are confused - one should interchange the 1 and 3 pinnames. Anyway, I tested both old and new TPS - readings were almost identical. My next step was to test the harness. All was according to this doc file [i.e. while jack is disconnected and ignition is ON, potential on pin 3 was 4.8 volts, ground (pin 2) was continuous], but I couldn't properly test the 1 pin, which is the signal from TPS to ECU. In the doc it says to ground the 32 pin of the ECU and at the same time check the 1 pin to ground. I couldn't disconnect the ECU jack, so I measured the resistance of between 1 pin and ground in was 65 KOhms. And I don't know is that good or not. So, everything seems to be OK, but the car is still at 4000 rpm, and scan tool still shows the p0121 error.
Does anyone has any ideas? I would appreciate also if someone could spare a wiring diagram of the ECU and sensors part, so I could check the connections and/or shortcuts or discontinuities.