How to Diagnose a Bad Mass Air Flow Sensor?

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Diagnose a foul Mass Air Flow Sensor:

A wide range of problems can mimic a foul MAF (Mass Air Flow) sensor, so it’s a decent idea to check a suspected sensor before you sally out and buy a brand new one.

Before getting started, however, you’ll want to possess the vehicle’s repair information handy. Manuals, like those from Chilton, are good, You’ll be able to find more information on accessing quality repair information in repair manuals.


Step 1. Check for Diagnostic Trouble Codes (DTCs):

If the check engine light is on, you’ll need to retrieve the corresponding diagnostic trouble codes employing a scan tool or code reader. These days, you’ll be able to even get a reasonable code reader for your smartphone.

Is there a MAF-related DTC stored within the PCM’s memory? Then there is also a problem with the MAF sensor or its circuit. As was mentioned, air/fuel ratio and misfire codes might also point to a problem with the MAF sensor (though, there are many other possibilities, as well).

Keep in mind: Sometimes, a nasty or bad (faulty) MAF sensor won’t set a code, especially on older vehicles with a kind of self-diagnostics called OBD-1.


Step 2. Perform a visible Inspection:

Next, you’ll be able to progress to performing a visible inspection. You’ll want to seem for issues, like damaged wires and poor connections. confirm that the MAF sensor’s electrical connector is clean and tight.

Repair any issues found in the visual inspection, clear the DTCs, and see whether the matter returns.


Step 3. Test the MAF Sensor:

Testing a MAF sensor will be tricky. Hotwire sensors output an analog voltage signal, while hot film sensors create a square wave digital frequency pattern.

It’s important to understand what kind of sensor you have⁠—and you ought to always consult the factory repair information before testing.

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