The intake air temperature (IAT) sensor is a thermistor which measures the temperature of the air entering the engine. The powertrain control module (PCM) applies 5 volts through a pull up resistor. When the intake air is cold, the sensor resistance is high and the PCM will monitor a high signal voltage on the IAT sensor signal circuit.


As the intake air warms, the sensor resistance becomes lower causing the PCM to monitor a lower voltage. If the PCM detects an excessively low IAT sensor signal voltage, high temperature indicated, DTC P0112 will set.


If the PCM detects an excessively high IAT sensor signal voltage, a low temperature is indicated, and DTC P0113 will set.


The PCM illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.


The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure.


The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.


Be sure to pull on each of the wires right at the sensor connector. A common failure is broken wires. Pull on them to see if they stretch or break.

More Auto Repair Help


Leave your comments

Post comment as a guest

0

    Comments (3)
    Subscribe To These Comments-----   

    • Guest - Everardo Gonzalez

      Muy buena Informacion, Gracias. Sigan poniendo nos ayudara muncho., y si pueden poner una foto muncho mejor para ir conosiendo cada parte y donde esta uvicada.

    • Guest - Tony

      MY 1996 TOYOTA TACOMA WONT START AFTER THE ENGINE TEMPTURE GETS TO NORMAL WHAT COULD CAUSE THIS
      <br />Low fuel pressure could be your problem.

    • Guest - Guest

      MY 1996 TOYOTA TACOMA WONT START AFTER THE ENGINE TEMPTURE GETS TO NORMAL WHAT COULD CAUSE THIS

    Latest Articles

    Impala Flashing Engine Light

    I have a 2003/2004 impala i was driving it on the high way ...

    Hyundai Tucson 2016 A/C Blows ...

    2016 Hyundai Tucson. A/C worked great, parked the car for a ...

    Chevrolet Blazer Lost Power ...

    2000 blazer 4x4 lost power to drivetrain going down the ...

    Dodge Durango Timing Chain ...

    My 03 Dodge Durango 4.7L engine was blowing white smoke ...

    2002 Chevy Blazer Keeps ...

    My 2002 blazer keeps dying on me when I am driving, and ...

    How Things Work

    Brakes- Rear Drum- How Do They Work

    The drum brake system consists of the following:

    Drum Brake Shoes: Applies mechanical output force, from hydraulic brake wheel cylinders, to friction surface of brake drums.

    Brake Drums: Uses mechanical output force applied to friction surface from drum brake shoes to slow speed of tire and wheel assembly rotation.

    Read more...

    Common Engine Codes

    Code P0341 Cam Position Sensor

    During cranking, the ignition control (IC) module monitors the 7X crankshaft position sensor signal. Once the IC module determines spark synchronization, 3X reference signals are sent to the powertrain control module (PCM). The PCM will command all six injectors on for one priming shot of fuel in all cylinders.

    Read more...