Using this probe, I don't have to disconnect the MAF sensor's connector to probe the front of the female terminal and possibly risk damaging it. The safest way to test these circuits, and the method I always use, is using a wire piercing probe. I'll be using these very same letters to describe the circuits (since the color of the wires will not be the same, on your Nissan vehicle, as those in the photos). These letters identify the circuits that feed into its connector.
The MAF sensor on your Frontier (or Quest, or Pathfinder, or Xterra) has the letters A through D etched onto it. Circuit Descriptions Of The Frontier, Quest, Pathfinder, Xterra MAF Sensor You don't need a fancy one, since all you'll be doing with it is verifying DC voltages. What Tools Do I Need?Ī Digital Multimeter is gonna' be your best friend in testing the MAF sensor on your Xterra (or Quest, or Pathfinder, or Frontier). Cleaning this type of sensor is very very easy and the last section of this article shows you just how. Why does it get dirty/contaminated? Well, this MAF sensor easily becomes contaminated with dirt and stuff from the air filter not performing its job or the box that holds the air filter is broken or not sealing correctly. The two biggest symptoms of dirty MAF sensor are 1) a lack of power upon acceleration and 2) bad gas mileage (although this is not an absolute truth). When the MAF sensor does get dirty (contaminated), it usually doesn't cause a tremendous amount of havoc. Dirty? OK, that the MAF sensor's 'hot-wires' are contaminated with dirt and/or oil. There's a good chance that the MAF sensor on your Pathfinder (or Quest, or Xterra, or Frontier) is just dirty.
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