Ford Mustang Forum - View Single Post - 2003 GT High Idle after intake install
View Single Post
post #2 of (permalink) Old 12-01-2013
SHELBY GT 350 Member
wmburns's Avatar
Joined: Sep 2010
Location: Houston
Posts: 6,821
Considering that the IAT sensor is on the +5 volt supply, the max voltage should be 5 volts. So 12 volts indicates a short to battery positive. If this were my car, I would be looking to see where the wiring harness could have been damaged during the repair.

IMO based upon the DTC code and the recent repair, replacing the IAC is a waste of $$.

P0113 - Intake Air Temperature (IAT) Circuit High Input

Indicates the sensor signal is greater than Self-Test maximum. The IAT sensor maximum is 4.6 volts or -50C (-58F).

Open circuit in harness
Sensor signal short to power
Damaged sensor
Improper harness connection
Damaged PCM

IAT V PID reading greater than 4.6 volts with key ON and engine OFF or during any engine operating mode indicates a hard fault.

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
wmburns is offline  
For the best viewing experience please update your browser to Google Chrome