Code P0113, IAT Sensor Circuit High Input: Notes

WARNING: This page is about a different car, the 1995 Pontiac Trans Sport, 1995 Oldsmobile Silhouette, and 1995 Chevrolet Lumina APV. However, it is still accessible from the selected car via links, so may be relevant.

Intake Air Temperature (IAT) sensor is a thermistor. Control module applies and monitors 5 volts on circuit to sensor. When air is cold, sensor resistance is high and control module will measure a high signal voltage. If air is warm, sensor resistance is low causing control module to measure low voltage. With Code P0113 set, control module will use a default value of about 63°F (17°C) for intake air temperature. Code P0113 does not illuminate Malfunction Indicator Light (MIL).

NOTE: Test numbers refer to numbers on diagnostic chart.

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