Intake Air Temperature Sensor

Tiny
MSFISHER2004
  • MEMBER
  • 2004 KIA RIO
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 128,000 MILES
My check engine light came on and after having Advance Auto run a test they told me it was the mass air flow sensor. I replaced the sensor and about 10 miles later the light came back on. The car always ran just fine without a noticeable problem. I took it back to Advance Auto and again they said the problem was the mass air flow sensor. The car was due for inspection, and of course, it has failed emissions with a P0113 (Intake Air Temp Circuit High Input). I suspected it might be in the electrical system but I am not able to purchase a piece of this from the dealer without purchasing an entire engine harness and Kia Rio's are difficult to find in salvage yards.
Monday, July 6th, 2009 AT 5:58 AM

6 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
What was code for MAF? Same one? Will need a digital multimeter to check circuit. Locate IAT on top rear of engine in dynamic box. Will have a red and blue wire. With engine cold 68 deg remove connector measure resistence across terminals of ITA. Should read 2.27Kohms to 2.76Kohms. Next warm up engine @176 deg measure again.30 to.33 Kohms. If good measure voltage on blue wire Should be 5V. If good Ohm check red wire from connector to ground should be 1 ohm. If all tests good replace IAT.
Let me know
Thanks for donate
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Monday, July 6th, 2009 AT 11:20 AM
Tiny
MSFISHER2004
  • MEMBER
  • 4 POSTS
Okay - I did as you suggested but didn't really get past the first step. There was no reading when I measured resistance across the terminals. However, when the car was on, the blue had no reading while the red to ground reading was 10 ohm. I was also told that it might help to change the air filter and reset the codes.
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Wednesday, July 8th, 2009 AT 7:02 PM
Tiny
MSFISHER2004
  • MEMBER
  • 4 POSTS
Just to clarify my last response - I removed the wires from the IAT and measured across the terminals for resistance and found it to be open - therefore, your next step would not apply. Where do I go from here?
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Thursday, July 9th, 2009 AT 10:38 AM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
If it is open then it is faulty replace did you measure on Kohms scale?
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Thursday, July 9th, 2009 AT 11:28 AM
Tiny
MSFISHER2004
  • MEMBER
  • 4 POSTS
Yes - it was measured on Kohms scale.
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Thursday, July 9th, 2009 AT 1:54 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
It is open need to replace
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Friday, July 10th, 2009 AT 12:03 PM

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