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Message: <blockquote data-quote="2slo95fiveoh" data-source="post: 1273867" data-attributes="member: 8966">UPDATE!!I have been searching and searching for some kind of solution to my 113 IAT sensor d.t.c., and I may have finally caught a break.So essentially the IAT sensor is a temperature-varying resistor. 5 volts goes in one end, the voltage goes through the resistor, and depending on what the air temperature is, it 'restricts' (provides resistance) to some of the voltage, and a lower voltage value comes out the other side and goes straight to the PCM. Then the PCM takes this value (somewhere between 0-5 volts) and adjusts timing based on it. The higher the air temp, the lower the resistance in the sensor, and therefore the lower the voltage reporting to the PCM.The code/description I keep having is: 113-IAT sensor circuit above maximum (4.6v) voltage Well I started off by buying a new IAT sensor, then comparing its resistance rating in the factory wiring with the old sensor in the factory wiring. The resistances were very similar to each other. Ok, that more than likely eliminates a bad sensor. Then I found a thread online where someone else had a similar issue with the same dtc, and they found the pigtail going to the IAT sensor was building up extra resistance and so they replaced the pigtail and the code went away.. Well I picked up a new pigtail and compared the resistance readings in multiple sensors to each of the pigtails (original and brand new)..Both sensors resistance readings using the original pigtail were nearly double what they were in the new pigtail! not only that, but I found a temperature vs. resistance chart for the sensor, and the new pigtail readings are very close to the provided ranges, so I am confident that the pigtail is causing the incorrect voltage to the PCM. It was a little late tonight when I got done soldering the new pigtail into the harness, so I didn't have time to start the car up and check the codes, but I'm feeling pretty good that I made some sort of progress with this issue.Now if only I could figure out my vibration issue, then I'd be set.</blockquote>