TEST 1: Making Sure The MAF Sensor Has Power

Making Sure The MAF Sensor Has Power. Mass Air Flow (MAF) Sensor Test 3.0L Nissan Quest (1993, 1994, 1995)

The very first thing to check is to verify that the Quest's MAF sensor is getting power (10 to 12 Volts) with the key in the ON position.

If power isn't available to MAF sensor, it won't function.

If power is available, then the next step is making sure it's getting Ground.

OK, let's start:

  1. 1

    Place your multimeter in VOLTS DC mode.

  2. 2

    Probe the wire that's identified with the letter A in the photo with the red multimeter test lead.

  3. 3

    Connect the black multimeter test lead to a good Ground point, preferably directly on the battery (-) negative terminal.

  4. 4

    Turn the key on but don't crank or start the engine.

  5. 5

    If all is good, then your multimeter should display 10 to 12 Volts DC.

Let's take a look at what your test results mean:

CASE 1: Your multimeter registered 10 to 12 Volts. This outcome confirms that the Quest's MAF sensor is getting juice (power). The next step is to test the Ground circuit, go to: TEST 2: Making Sure The MAF Sensor Has Ground.

CASE 2: Your multimeter DID NOT register 10 to 12 Volts. Recheck all of your multimeter connections and retest. If still no voltage, then the Quest's MAF sensor is not the cause of the MAF code or MAF issue, since without this voltage, the MAF sensor will not produce a signal to the computer.

Finding and repairing the source of this missing voltage will resolve the MAF sensor code or problem with your Nissan Quest.

TEST 2: Making Sure The MAF Sensor Has Ground

Making Sure The MAF Sensor Has Ground. Mass Air Flow (MAF) Sensor Test 3.0L Nissan Quest (1993, 1994, 1995)

OK, now know that you have confirmed that your Nissan Quest's MAF is getting power. The next step is to check that it also has a good path to Ground.

Ground is fed to your Quest's MAF sensor by the wire identified with the letter B in the photo above.

To check for the presence of Ground, we're gonna' do a simple multimeter voltage test.

Here's the test:

  1. 1

    Turn key to the OFF Position and place your multimeter in Volts DC mode.

  2. 2

    Disconnect the MAF sensor from its connector.

  3. 3

    Connect the black multimeter test lead to the MAF sensor wire identified with the letter B in the photo.

    Use a back probe or a wire piercing probe to check the wire.

  4. 4

    Connect the red multimeter test lead to the battery (+) positive terminal.

  5. 5

    Your multimeter should register 10 to 12 Volts if Ground is present.

Let's take a look at what your test results mean:

CASE 1: Your multimeter registered 10 to 12 Volts. This result indicates that the Quest's MAF sensor has a good Ground circuit. The next step is to test the MAF signal, go to TEST 3.

CASE 2: Your multimeter DID NOT register 10 to 12 Volts. Verify that all of your multimeter connections are connected securely and try the test again. If still no voltage, then this result lets you know that the Quest's MAF sensor is not the cause of the MAF trouble code lighting up your check engine light (CEL) or MAF issue, since without this Ground, the MAF sensor will not produce a signal to the computer.

Finding and repairing the cause of this missing Ground will resolve the MAF sensor issue with your Nissan Quest Mini-Van.

Nissan Vehicles:

  • Quest 3.0L
    • 1993
      1994
      1995