With the engine idling, read the signal wire at the mass air flow sensor and you should see between .9 to 1.6 volts. Have a friend start your Xterra, but make sure your parking brake is on and your transmission is in PARK or NEUTRAL. This means that you must steer clear of the engine, cooling fans as well as any moving parts and keep your tools clear as well. For this part of the test, you will need to start your 3.3 liter engine. Once you have the Xterra MAF sensor reconnected, you must use your multimeter and pierce the wire at PIN 3.
The MAF signal wire is the one that leads to PIN 3, and you will need to reconnect the MAF connector for this part of the test. Now if you have a ground circuit at the wire of PIN 2, then the last leg of this DIY article is to check for the Xterra MAF sensor signal.īefore you begin testing the Xterra MAF sensor signal, you would be best served with a notepad and a pencil to record your base values. To be clear, do not use the power wire at PIN 1 for power to check for a ground circuit at PIN 2. Testing this wire should be done through your Nissan battery and never through your wiring harness. If you have power here the next wire to check on is the ground circuit. This wire is usually black with a yellow wire, although it may vary depending on your vehicle. Remember that you are testing on the ENGINE harness side of the Xterra MAF sensor. With your key turned to the ON position, you should have around 12 volts of power here. To test for power here however, you need to turn the Xterra ignition to the ON position. This is found at PIN 1 in our Nissan MAF wiring diagram. Using your digital multimeter, you can test the power wire at the MAF connector. Once you locate the mass air flow sensor, disconnect it and you are ready to begin testing. The Nissan MAF in your 3.3 liter truck is mounted to the air intake box and connected to your intake tract. Before you can test your Xterra MAF sensor, you will need to locate it.
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