For the longest time i have had issues with my TPS. checked and replaced everything and the problem still haunts me. Today I had a possible breakthrough. For the first time ever the trouble code 15 came up. 22 and 21 would come up all the time for the TPS but never 15 which is for the coolant temp. sensor. I check my wire diagram and they share a common ground to the computer. They are also spliced with the IAT sesnor. Does anyone know where the three come together? Also i was tugging one of the grounds, not very hard, and the TPS ground came unconnected from the TPS. would a loose ground at the TPS cause the code 15 when the ground is spliced with the TPS? sorry so long. any help is much appreciated. thanks.

 

also i checked continuity by back probing the ECM ground wire D2 and then checking each sensors ground wire. they all tested ok. so there must be a loose connection in the splice that is good one minute and then next... it slips loose. any other ideas? thanks.