Intake Air Temperature Sensor(IAT)OPERATION
The Intake Air Temperature (IAT) sensor resistance changes in response to the intake air temperature. The sensor resistance decreases as the surrounding air temperature increases. This provides a signal to the PCM, indicating the temperature of the incoming air charge. The following symptoms can be caused by a faulty IAT sensor due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit.
IAT Sensor Symptoms
- Extended crank time when the engine is cold
- Poor fuel economy
- Spark knock