Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit Description
The DTC P0110 Intake Air Temperature (IAT) sensor circuit diagnostic detects an out of range sensor signal. IAT sensor is a thermistor that is an integral part of the Mass Air Flow (MAF) sensor. Electrical resistance of IAT sensor is high when the air temperature is cold, and resistance is low when air temperature is warm. IAT sensor is wired in series with a fixed resistor located in the Powertrain Control Module (PCM). PCM applies 5 volts to the IAT sensor. PCM monitors voltage across IAT sensor and converts voltage into a temperature reading. Voltage measured by PCM will be high when air temperature is cold, and low when air temperature is warm. See IAT RESISTANCE/SIGNAL VOLTAGE table.
| Temperature | IAT Resistance | IAT Signal Voltage |
|---|---|---|
| Cold | High | High |
| Warm | Low | Low |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.