DTC Advanced Diagnostics: P0097, P0098
DTC P0097:Intake Air Temperature (IAT) Sensor 2 Circuit Low Voltage
DTC P0098:Intake Air Temperature (IAT) Sensor 2 Circuit High Voltage

General Description

The powertrain control module (PCM) monitors intake air temperature (IAT) sensor 2 for electronic malfunctions. IAT sensor 2 is a thermistor that detects intake air temperature, which is utilized for air/fuel ratio feedback control to compensate for the atmospheric density fluctuations that accompany changes in intake air temperature. The IAT sensor 2 resistance varies depending on temperature. The sensor resistance and the output voltage increase as the intake air temperature decreases. The output voltage is continuously monitored against minimum and maximum thresholds. If the IAT sensor 2 output voltage is a specified value for a specified time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
0.5 second or more
DTC Type
Two drive cycles, MIL on

Enable Conditions
Condition
 
Vehicle
ON mode

Malfunction Threshold
DTC: P0097

The IAT sensor 2 output voltage [IAT Sensor (2)] is less than 0.0892 V for at least 0.5 second.

DTC: P0098

The IAT sensor 2 output voltage [IAT Sensor (2)] is greater than 4.9024 V for at least 0.5 second.

[ ]: HDS Parameter

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
DTC: P0097
IAT sensor 2 TA line short to ground

DTC: P0098
IAT sensor 2 TA line short to power
IAT sensor 2 TA line open
IAT sensor 2 SG line open

Common
IAT sensor 2 failure
PCM internal circuit failure

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

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.