Code P0113, IAT Sensor Circuit (High Temperature Indicated): Notes

The Intake Air Temperature (IAT) sensor is a thermistor. PCM applies and monitors 5 volts on circuit to sensor. When air is cold, sensor resistance is high and PCM will measure a high signal voltage. If air is warm, sensor resistance is low causing PCM to measure low voltage.

Code P0113 will set when the following conditions are present.

Signal voltage indicates an intake air temperature greater than 284°F (140°C).
Vehicle speed is greater than 35 MPH.
Above conditions are met for at least for 5 seconds.

With Code P0113 set, PCM will use a default value of 61°F (16°C) for intake air temperature. Code P0113 does not illuminate the Malfunction Indicator Light (MIL).

NOTE: Test numbers refer to numbers on diagnostic chart.

Tech-1 may be used to diagnose this fault since PCM transmits actual values when the fault is present. A grounded circuit will cause Tech-1 to display a temperature of approximately 297°F (147°C).
If Tech-1 displays -40° with IAT sensor disconnected, PCM and wiring are okay. Replace IAT sensor.