P0110

DTC P0110: Intake Air Temperature (IAT) Sensor Circuit

Circuit Description
The Intake Air Temperature (IAT) Sensor uses a thermistor to control the signal voltage to the Engine Control Module (ECM). The ECM supplies a 5 volt reference voltage and a ground to the sensor. When the air is cold, the resistance is high; therefore IAT sensor signal voltage will be high. If the intake air is warm, resistance is low; therefore the IAT sensor signal voltage will below.

Conditions for Setting the DTC
- Change in intake air temperature (IAT) is less than or equal to 3 °C (37.4 °F).
- No disabling faults present.
- Engine is running.
- Soak time is greater than or equal to 480 minutes.
- Intake air temperature (IAT) is stored on previous trip.

(Driving Condition)
- Throttle position is greater than 0.2%.
- Vehicle speed is 40 km/h or greater.
- Airflow is greater than 15 g/sec.
- Stuck drive test counter is 300 seconds or greater.

(Idling Condition)
- Throttle position is 0.2% or less.
- Vehicle speed is 2 km/h or less.
- Stuck idle test counter is 60 seconds or greater.

Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
- A history DTC is stored.

Conditions for Clearing the MIL/DTC
- The MIL will turn OFF after four consecutive ignition cycles in which the diagnostic runs without a fault.
- A history DTC will clear after 40 consecutive warm up cycles without a fault.
- The DTC(s) can be cleared by using the scan tool.
- Disconnecting the ECM battery feed for more than 10 seconds.

Diagnostic Aids
Check for a faulty electrical connection to the ECM. If the vehicle is at ambient temperature, compare the IAT sensor to the Engine Coolant Temperature (ECT) sensor. The IAT sensor and the ECT sensor should be relatively close to each other. Use the temperature vs. Resistance Values table to evaluate the possibility of a skewed sensor. Refer to Temperature VS Resistance.

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Troubleshooting