2003 Ford F-150 check engine light, code P0113

Tiny
DENVER291
  • MEMBER
  • 2003 FORD F-150
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
Already changed the air charge sensor in the intake tube. The light came on again the second time I started the engine, about 10 minutes after I changed the sensor.
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Saturday, November 29th, 2014 AT 6:14 PM

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Tiny
CARADIODOC
  • EXPERT
P0113 - Intake Air Temperature Circuit High Input

Actually, the sensor is the last thing to suspect for this fault code. There is only one component in it, that's a temperature-dependent resistor, (thermistor), and failure is extremely rare. As you can see by this code description, fault codes never say to replace parts or that they're bad. They only indicate the circuit that needs further diagnosis or the unacceptable operating condition. For this circuit you're most likely to find a stretched terminal in a connector, a corroded connector pin, or a break in one of the wires. Anything that creates an "open circuit", meaning it has a break in it, will result in the computer seeing 5.0 volts on the signal wire, and that's what sets that code. In a properly-working circuit, the voltage will always stay between 0.5 and 4.5 volts.

If you have a scanner to view live data, it will show 5.0 volts for this sensor, but the next step requires an inexpensive digital voltmeter. It's important to understand that voltage readings in this circuit are only valid when the sensor is not disconnected, so you have to back-probe the terminals through the rubber seals where the wires go in. Measure the voltages on both sensor wires and list them here. Normally you will find 0.2 volts on the ground wire and typically between 1.0 and 4.0 volts on the signal wire. Knowing what you have on each wire will tell us where to go next.
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Saturday, November 29th, 2014 AT 6:54 PM
Tiny
DENVER291
  • MEMBER
Thanks for your help, I kinda suspected a broken wire. I have had trouble with squirrels chewing wires, on my vehicles before. Now I just have to find the break, or bad connection.
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Sunday, November 30th, 2014 AT 9:12 AM

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