DTC Advanced Diagnostics: P0114
DTC P0114:Intake Air Temperature (IAT) Sensor 1 Intermittent Interruption

General Description

The powertrain control module (PCM) monitors intake air temperature (IAT) sensor 1 for electronic malfunctions. IAT sensor 1 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 1 resistance varies depending on temperature. The sensor resistance and the output voltage increase as the intake air temperature decreases. The difference between the IAT sensor 1 value and the filtered value is monitored continuously against a calibrated threshold. Due to the filtering of the value, a disturbance peak affects only the unfiltered voltage value and the difference between the two voltage values can be evaluated against a calibrated threshold. If the IAT sensor 1 output voltage and the filtered 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
1 second or more
DTC Type
Two drive cycles, MIL on

Enable Conditions
Condition
Minimum
Maximum
Engine coolant temperature [ECT Sensor 1]
139.93 °F (59.96 °C)
–
Intake air amount
–
24 kg/h (52 lbs/h)
Vehicle speed [Vehicle Speed]
–
6 mph (10 km/h)
Other
All conditions must be met at least 10 seconds
[ ]: HDS Parameter

Malfunction Threshold
The absolute difference between the IAT sensor 1 voltage and the filtered voltage is more than 0.8 V for at least 1 second.

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
IAT sensor 1 TA2 line short to power
IAT sensor 1 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.