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 humidity sensor measures the ambient humidity of the air in the sensor bore. The duty cycle signal varies with intake air humidity and is displayed by the scan tool as %. The ECM applies 5 V to the circuit. The signal circuit is shared by the humidity sensor and the intake air temperature (IAT) sensor 2.
The sensors listed below share an ECM supplied 5 V reference circuit:
- IAT sensor 2
- Humidity sensor
- BARO sensor 2
The sensors listed below share an ECM supplied low reference circuit:
- IAT sensor 1
- IAT sensor 2
- Humidity sensor
- BARO 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.