At an idle of about 680 RPMs, the MAF sensor outputs about 3.2 K Hertz.Here's what it looks like on a digital multimeter: It then converts this measurement into a Hertz frequency reading (as measured by a digital multimeter that can read Hz Frequency) and shoots it to the PCM. The MAF sensor's job is to measure the amount of air the engine is breathing at any given RPM. For this, the PCM relies on the mass air flow sensor, among several of the sensors that monitor the engine and transmission. The fuel injection computer needs to know the amount of air the engine is breathing to inject the correct amount of fuel (among several things) and keep your GM vehicle idling, running smooth, accelerating, polluting less, etc. Basic Working Theory Of The GM MAF Sensor If it doesn't, they'll find you the right one. Not sure if the MAF sensor will fit your particular GM vehicle? Don't worry, once you get to the site, they'll make sure it fits. The following links will help you comparison shop for the MAF sensor: Air Temperature Sensor Circuit (low reference = Ground). Each of the 3 Tests, that make up this article, will use these circuit descriptions: Each wire (circuit) has a specific job to do and below, you'll find the description. The MAF sensor covered by this tutorial has 5 wires coming out of the connector. To see what this tool looks like, click here: Wire Piercing Probe.Ĭircuit Descriptions Of The MAF Sensor Connector
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