IAT Trouble

Reply Subscribe

Thread Tools

Search this Thread

Aug 20, 2019 | 07:36 PM

Limited_865

Thread Starter

New User

Joined: Sep 2016

Posts: 21

Likes: 0

IAT Trouble

I have a 2003 Ford Expedition with the 5.4 2V. I am get the code P0112 and P1112 for a fault with the sensor. I have tested the sensor and the temperature reading got as high 250 degrees. I am at a loss. Is there a wiring diagram available or have any of you guys experienced this issue.

Thanks in advance

Aug 20, 2019 | 08:22 PM

Spaznaut

Fleet Mechanic

Joined: Aug 2004

Posts: 1,276

Likes: 7

From: NE Tennessee

So you tested the sensor and the reading got up to 250. Why would you not replace it?

Aug 20, 2019 | 08:23 PM

Limited_865

Thread Starter

New User

Joined: Sep 2016

Posts: 21

Likes: 0

I apologize I did replace the sensor.

Aug 21, 2019 | 11:09 AM

pdqford

Logistics Pro

Joined: Jan 2001

Posts: 3,740

Likes: 37

From: Central NYS

Quote:

Originally Posted by Limited_865

I have a 2003 Ford Expedition with the 5.4 2V. I am get the code P0112 and P1112 for a fault with the sensor.
Thanks in advance

Those two codes don’t indicate a fault with the IAT sensor, but with a fault with the IAT sensor circuit, which includes the sensor. Is the IAT sensor connector fully connected? And are the connector pins clean, straight, and tight?
With the key in the on position, do you have ~5.0 volts on the grey/red wire at the IAT connector?
Also check pin 19 of the PCM connector for clean and tight.
The P1112 code is indicating an intermittent IAT reading.