Circuit/System Description
WARNING: This page is about a different variant/trim than selected.
The mass air flow (MAF) sensor is integrated with the intake air temperature (IAT) sensor. The MAF sensor is an air flow meter that measures the amount of air entering the engine. The engine control module (ECM) uses the MAF sensor signal to provide the correct fuel delivery for all engine speeds and loads. The MAF/IAT sensor has the following circuits:
- Ignition 1 voltage
- MAF sensor ground
- MAF sensor signal
- IAT sensor signal
- IAT low reference
The ECM applies 5 volts to the MAF sensor on the MAF sensor signal circuit. The sensor uses the voltage to produce a frequency based on the inlet air flow through the sensor bore. The frequency varies in a range of near 1,700 Hertz at idle to near 12,500 Hertz at maximum engine load.