- #2004 chevy cobalt ss how to
- #2004 chevy cobalt ss code
Now, in testing the MAF sensor, you won't be looking for a specific Hertz (Hz) number at a specific RPM, but for crazy fluctuations in the signal that don't correspond to the amount of air entering the engine or NO SIGNAL AT ALL.
At 2500 RPMs it hovers around 5.2 K Hz.Īs you can see, the more air the engine breathes (or the higher the RPMs) the higher the MAF output signal becomes, and of course the less air the engine breathes, the lower the reading on your digital multimeter. At about at 1500 RPM s the MAF signal output is about 4.2 K Hz. Let me emphasize the words ' outputs about' because every vehicle will output a slightly different value depending on several conditions like: engine temperature, ambient air temperature, etc. 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 Although not an absolute must, this tool is a time saver of the first order. 
If you need to buy one or are looking to upgrade, check out my recommendations here: Buying A Digital Multimeter For Automotive Diagnostic Testing.A digital one that can read Hertz frequency is a must have tool to test the MAF sensor on your vehicle.These are the tools you'll need or may need: Your car or truck or SUV may idle rough and stall.Ī scan tool is one of those MUST have tools to be able check and diagnose today's modern cars and trucks, but for the tests in this article you don't need one.No Power when you accelerate the car or truck.Lean and/or Rich Diagnostic Trouble code(s).P0103: Mass Air Flow (MAF) Sensor Circuit High Input.P0102: Mass Air Flow (MAF) Sensor Circuit Low Input.P0101: Mass Air Flow (MAF) Sensor Circuit Range/Performance Problem.
P0100: Mass Air Flow (MAF) Sensor Circuit Malfunction. #2004 chevy cobalt ss code
A MAF sensor diagnostic trouble code (DTC) stored in your vehicle computer's memory.The most obvious one is that the CHECK ENGINE light (CEL) will be on on your instrument cluster and driving you nuts. You can find this tutorial in Spanish here: Cómo Probar El Sensor MAF (2005-2007 3.5L GM) (at: ).
#2004 chevy cobalt ss how to
How To Test The MAF Sensor on 3.1L, 3.3L, and 3.8L Buick, Oldsmobile, Pontiac (1988-1996). How To Test The GM MAF Sensor: Buick, Chevy, Olds, Pontiac 3.8L V6 Engines (1996-2005). How To Test The GM mass air flow sensor (Early Type): Buick, Chevy, Olds, Pontiac 3.1L, 3.4L, 4.3L, 5.0L, 5.7L V6 Engines (1996-2005). In case this isn't the MAF sensor article you're needing, there are several more I've written and you can find some of them here: This MAF test is done in 3 easy steps.Īll you'll need, to test the MAF sensor (with this tutorial) is a multimeter that can read Hertz frequency (if you don't have one, I've made a recommendation on where you can buy a reasonably priced one below). In this test tutorial, I'll show you how to test the mass air flow sensor to see if it's bad (and lighting up the check engine light) or not.
0 kommentar(er)
