Auto Repair : How Do You Clean or Check a Mass Air Flow Sensor?

Auto Repair : How Do You Clean or Check a Mass Air Flow Sensor?


how do you clean or check a mass airflow sensor mass airflow sensor is used on fuel-injected vehicles to tell the computer how much air is going into the engine usually it’s mounted between the air filter assembly and the intake it has an electrical connection going to it and it’ll be screwed into this plenum work here so that it’s in the air flow now to check it for for cleaning purposes or or for inspection purposes it needs to be removed so the first thing you want to do is you want to carefully disconnect the electrical connection by lifting up on the release tab and pulling it off and kind of set that aside and then there’ll be a couple of screws holding it in place sometimes they’ll be a security screw in this case there are security Torx screw and so you want to make sure that you have the appropriate tool for that so you take the screws out and then you want to carefully pull straight up now a mass airflow sensor will have one or more very very fine wires these wires are usually made out of platinum because platinum has a very measurable resistance characteristics and what we’re measuring in this case is the resistance through the wire as air flows across it and so if the air if there’s more air or the air is cooler it requires more voltage to keep the the wire at a constant voltage and so the computer interprets that as a indication of how much air is moving into the motor so once it’s removed you can use a commercially available carburetor cleaner and you can spray the wires and this will remove any oxidation that might have built up on the wire that would affect it’s accuracy and then you want to let this air dry you don’t want to wipe it with anything because again you might end up damaging the wires so once you’ve sprayed it with the carb cleaner you want to let it air dry and then you can reinstall it once you’ve removed and cleaned the mass airflow sensor you’re going to want to check it now different mass airflow sensors from different manufacturers are going to have different acceptable ranges but effectively what you’re looking to do is check the resistance between certain pins on the connector and when you do that you’re going to want to get a range that falls within the spec that the manufacturer specifies in this case we’re getting eleven point eight million ohms which is fine for that particular wire or if you’re outside of that range or you’re getting no resistance at all then the mass airflow sensor is most likely damaged and needs to be replaced if however your resistance ranges are appropriate then the mass airflow sensor should be fine with a good cleaning and it can then be reinstalled


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