dpappyp
Member
- Joined
- February 11, 2008
- Messages
- 17
- Reaction score
- 1
- City, State
- milwaukee
- Year, Model & Trim Level
- 2000 Mountaineer
If I clear the code it might stay off for a minute or might stay off for days but it always comes back. Sometimes the code even clears itself, but soon enough it pops up again. I tried cleaning the MAF (iat is apart of it) and then replaced the maf altogether, but no luck. I was reading the live IAT sensor temperature reading and yes it does erroneously bounce up to its maximum reading, somewhere north of 300 degrees fahrenheit (corresponds to the low voltage input error). I did notice that in general it reads a normal temp at idle, but almost always maxes out when accelerating and then drops back down when I get up to speed. I tried researching that specific symptom but came up empty. Has anyone else seen this issue? Car runs fine, but I really need to get this figured out before an upcoming emissions test. Could it be as simple as a wire shorting out somewhere in the harness? The relation to acceleration makes me think otherwise, however. Any clues would greatly appreciated.
FIXED:
Well I went with the idea that there was a short somewhere in the harness, but trying to locate it in the bundled wiring harness would have been an absolute mess. So, instead I located the corresponding pin at the PCM for the IAT (pin 39) and chopped off the gray wire going to it. Then I chopped the wire at the IAT sensor and ran a new wire from the PCM pin 39 to the IAT sensor. No more temperature reading fluctuating with acceleration, it's steady regardless of air flow or jostling. Looks like I'll be passing my emissions test.
FIXED:
Well I went with the idea that there was a short somewhere in the harness, but trying to locate it in the bundled wiring harness would have been an absolute mess. So, instead I located the corresponding pin at the PCM for the IAT (pin 39) and chopped off the gray wire going to it. Then I chopped the wire at the IAT sensor and ran a new wire from the PCM pin 39 to the IAT sensor. No more temperature reading fluctuating with acceleration, it's steady regardless of air flow or jostling. Looks like I'll be passing my emissions test.