Code P0113, IAT Sensor Circuit High Input: Notes

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).

1. 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).
2. If Tech 1 displays -40° with IAT sensor disconnected, control module and wiring are okay. Replace IAT sensor.