Advanced Diagnostics

Advanced Diagnostics - DTC P0098: Intake Air Temperature (IAT) Sensor 2 Circuit High Voltage










General Description
Intake air temperature (IAT) sensor 2 is a thermistor that senses intake air temperature. IAT sensor 2 is installed in the intake manifold and IAT sensor 1 is attached to the intake air duct. The sensor's resistance varies depending on the air temperature sensed by its thermistor. As the intake air temperature falls, the sensor resistance increases, resulting in an increase of sensor output voltage. As the intake air temperature rises, the sensor resistance decreases, resulting in a decrease of sensor output voltage. If the IAT sensor 2 output voltage is excessively high, the powertrain control module (PCM) detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status






Enable Conditions






Malfunction Threshold
The IAT sensor 2 output voltage is 4.92 V or more for at least 2 seconds.

Diagnosis Details

Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.