DTC P0110 Intake Air Temperature Circuit; DTC P0112 Intake Air Temperature Circuit Low Input; DTC P0113 Intake Air Temperature Circuit High Input: Description
The intake air temperature (IAT) sensor, mounted on the mass air flow (MAF) meter, monitors the intake air temperature. The IAT sensor has a thermistor that varies its resistance depending on the temperature of the intake air. When the air temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. The variations in resistance are reflected as voltage changes to the ECM terminal (see Fig 1).
The intake air temperature sensor is connected to the ECM (see WIRING DIAGRAM ). The 5 V power source voltage in the ECM is applied to the intake air temperature sensor from terminal THA (THAR) via resistor R.
That is, the resistor R and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor changes in accordance with changes in the intake air temperature, the voltage at terminal THA (THAR) also changes. Based on this signal, the ECM increases the fuel injection volume to improve the driveability during cold engine operation.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0110 | Open or short in intake air temperature sensor circuit for 0.5 seconds |
|
| P0112 | Short in intake air temperature sensor circuit for 0.5 seconds |
|
| P0113 | Open in intake air temperature sensor circuit for 0.5 seconds |
|
HINT:
After confirming DTC P0110, P0112 or P0113, confirm the intake air temperature in Powertrain /Engine and ECT / Data List / Intake Air using Techstream.
| Temperature Displayed | Malfunction |
|---|---|
| -40°C (-40°F) | Open circuit |
| 140°C (284°F) | Short circuit |