Circuit/System Description
WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
The intake air temperature (IAT) sensor 3 is a variable resistor that changes an engine control module (ECM) supplied 5 V signal. The signal varies with intake manifold air temperature and is displayed by the scan tool as °C (°F). The IAT sensor 3 is integrated with the manifold absolute pressure sensor in the intake manifold. The ECM provides a ground for the IAT sensor 3 low reference circuit.
IAT Sensor 3 - Temperature, Resistance, Voltage Table
| IAT Sensor 3 | IAT Sensor 3 Resistance | IAT Sensor 3 Signal Voltage |
|---|---|---|
| Cold | High | High |
| Warm | Low | Low |