Circuit/System Description
WARNING: This page is about a different car, the 2016 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
The sensors listed below are integrated within the Multifunction Intake Air sensor:
- IAT sensor 1
- IAT sensor 2
- Humidity sensor
- MAF sensor
- BARO pressure sensor
The humidity sensor measures the ambient humidity of the air in the sensor bore. The signal varies with intake air humidity and is displayed by the scan tool as duty cycle %. The humidity sensor and the intake air temperature (IAT) sensor 2 share the same signal circuit. The ECM applies 5 V to the circuit.
Ignition voltage and ground circuits are supplied to the multifunction intake air sensor's internal circuits for these sensors:
- IAT sensor 2
- Humidity sensor
- MAF sensor