Circuit/System Description
WARNING: This page is about a different variant/trim than selected.
The sensors listed below are integrated within the multifunction intake air sensor:
- Intake Air Temperature (IAT) sensor 1
- IAT sensor 2
- Humidity sensor
- MAF sensor
- Barometric pressure (BARO) sensor 2
The IAT sensor 2 produces a frequency signal based on the inlet air temperature very close to the humidity sensor within the sensor bore. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F) and Hertz (Hz). The signal circuit is shared by the IAT sensor 2 and the humidity sensor.
The sensors listed below share an ECM supplied 5 V reference circuit:
- IAT sensor 2
- Humidity sensor
- BARO pressure sensor 2
The sensors listed below share an ECM supplied low reference circuit:
- IAT sensor 1
- IAT sensor 2
- Humidity sensor
- BARO pressure sensor 2
Ignition voltage and ground circuits are also supplied to the multifunction intake air sensor's internal circuits for the mass air flow (MAF) sensor.
IAT Sensor 2 - Temperature, Frequency Table
| IAT Sensor 2 | IAT Sensor 2 Frequency | IAT Sensor 2 Temperature |
|---|---|---|
| Cold | 45 Hz | -40°C (-40°F) |
| Warm | 302 Hz | 104°C (219°F) |