B4000 Regular Cab 4WD V6-4.0L OHV (1997)
Intake Air Temperature Sensor: Description and Operation
INTAKE AIR TEMPERATURE (IAT) SENSOR
Detects intake air temperature. Sensor has the same function as ECT. PCM uses IAT signals as correction factors in calculation of fuel, spark and
MAF.
NOTE: Resistance changes with temperature.
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Resistance decreases as temperature increases.
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Resistance increases as temperature decreases.
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Uses thermistor devices.
NOTE:
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Sensor is connected to voltage divider so that varying resistance of sensor causes a variation in total current flow. Dropped voltage across a
fixed resistor in a series with sensor determines voltage signal at PCM.
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If the intake air temperature sensor or circuit has an open or short, Diagnostic Trouble Code No. P0112, P0113 or P1112 is output.
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If the intake air temperature sensor circuit fails, no particular driveability symptom will be noticed.
