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You will find several signs and symptoms that may indicate a poor mass ventilation (MAF) sensor, including rough idle, excessive fuel consumption or otherwise enough fuel reaching the injectors, engine stalling as well as difficulty beginning. However, a number of other components can cause the problems. Adopt these measures to look for the sensor's condition,Autoboss V30 whether you've got a hot wire MAF-type sensor--of all Ford automobiles--or even the hot film MAF type sensor--of all GM automobiles.

        1

        Retrieve the problem codes out of your vehicle engine's computer utilizing a scan tool. If you don't get one of the tools, most auto parts stores will retrieve this code for you personally totally free. On Ford automobiles, a 26, 56, 66 or 76 code signifies a small problem with this particular sensor on GM automobiles, a 33, 34 or 36 code suggests exactly the same problem.

        2

        Appraise the hot wire MAF sensor's output current. Using the engine running at idle, back-probe the brown wire having a whitened strip around the MAF sensor utilizing a voltmeter. Your meter should read around 2.5 volts.VAS 5054A Gently tap the sensor together with your finger the current should hold steady. Pull around the throttle mechanism together with your hands to improve engine revoltions per minute watching the meter. The current should increase easily and in accordance with throttle opening. In case your current blood pressure measurements are from specifications, the sensor isn't creating the right signal.

        3

        Look into the self-cleaning circuit relay in your hot wire MAF sensor. The engine computer uses this circuit to wash the MAF wire or realizing element. When the relay that controls current for this circuit is damaged, the vehicle computer won't have the ability to clean the wire eventually, grime along with other pollutants will hinder the sensor operation. Talk to your vehicle service manual to discover and test this relay.

        4

        Appraise the hot film MAF sensor's frequency. Hook the red-colored probe of the multimeter able to reading through milliseconds towards the signal wire associated with a fuel injector around the vehicle, and also the black probe to some good ground--a bolt or metal bracket around the engine. Browse the injector's pulse width output while turning the engine and also at idle. Compare these blood pressure measurements using the specifications provided inside your vehicle service manual. When the pulse width has run out of range, your MAF sensor is creating a poor signal or otherwise whatsoever.Mb Star C3

Tips & Alerts

    Talk to your vehicle service manual to determinate the kind of sensor set up in your vehicle and also the sensor's and fuel injectors' output specifications. You can purchase one for the most part auto parts stores or consult one free of charge for the most part public libraries.