The mass air flow (MAF) sensor on the 93, 94, 95 Nissan Quest Mini-van (3.0L V6) can be tested in three easy tests and without using an automotive scan tool. All you'll need, to use the info in this test article, is a simple multimeter.
This part of the tutorial includes some handy information you'll need to make testing the MAF on your Nissan Quest Mini-Van as easy and as head-ache free as possible.
In case this is not the article you're looking for, here's a list of other Nissan MAF sensor test articles in this site:
- How to Test the Nissan MAF Sensor Frontier, Quest, Pathfinder, and Xterra 3.3L V6 (1999-2004).
- How to Test the Nissan MAF Sensor D21 Hard Body Pick Up 2.4L 4 Cyl. (1990-1995).
- How to Test the Nissan MAF Sensor: Sentra 1.6L 4 cyl. (1995-1999).
- How to Test the Nissan MAF Sensor: Sentra 1.8L 4 cyl. (2000-2002).
Puedes encontrar este tutorial en Español aquí: Prueba: Sensor de Flujo de Aire (MAF) 3.0L Nissan Quest (1993, 1994, 1995) (en: autotecnico-online.com).
Symptoms of a BAD Nissan Quest MAF Sensor
The most common symptom you'll experience, on your Nissan Quest when the MAF has gone bad, is a lack of power when you accelerate the mini-van. Here are a couple of others:
- MAF Codes that light up the CHECK ENGINE LIGHT (CEL) on your instrument cluster.
- Nissan vehicle specific Code 12 (Mass Air Flow Sensor Circuit).
- OBD II code P0100.
- MAF sensor malfunction that DOES NOT light up the CHECK ENGINE LIGHT (CEL).
- Lean and/or Rich code(s).
- OBD II code P0171.
- OBD II code P0172.
- A tremendous lack of power upon acceleration.
- Black smoke coming from the tail-pipe.
- BAD gas mileage.
- Vehicle may idle rough and stall.
What Tools Do I Need?
To use the test info in this article, you'll only need to use a multimeter. You can use a digital multimeter or an analog multimeter, either one will do the job. I would also recommend using a Wire-Piercing Probe to to test the signal of each wire (to see what this tool looks like, click here: Wire-Piercing Probe.
Circuit Descriptions of the Quest MAF Sensor Connector
The mass air flow (MAF) sensor on your Nissan Quest Mini-Van is a three wire sensor. One feeds power (12 Volts), another supplies a path to ground, and the last is the one that delivers the MAF signal, that the sensor creates, to the fuel injection computer.
In the photos that you'll be using through out the article, I have labeled the wires with the letters A thru' C. Below is a brief description of what each circuit does:
- Letter A:
- Power (12 V) Circuit
- Letter B:
- Ground Circuit.
- Letter C:
- MAF Signal output Circuit.
The power and ground circuits can be tested with the MAF sensor's connector disconnected from the mass air flow sensor and testing the front of the connector. But this can be a risky move since the female terminal can get damaged. What I suggest you do, is to use a Wire Piercing Probe to get to the signal inside the wire. If you need to see what this tool looks like, click here: Wire-Piercing Probe. Independent of the method you use, be careful not to damage the wire(s). Take all safety precautions.
How Does the Nissan Quest MAF Sensor Work?
The mass air flow (MAF) sensor's role in the fuel injection system of your Nissan Quest, is to measure the amount of air that the engine is breathing and to turn this measurement into a DC voltage signal that the fuel injection computer can use to efficiently run the mini-van, whether it's just idling at a traffic-light or cruising down the road.
To be a little more specific... since the Quest's 3.0l V6 engine will breathe in more air at, let's say, 2,500 RPM than when it's sitting at an idle of 900 RPM this will cause the MAF sensor to create and send a higher DC voltage signal to the computer than at idle (as a point of reference, the value of the MAF sensor around 2,500 RPM is about 2.4 Volts DC). And of course when the engine returns to idle, this voltage signal goes back to a lower voltage value (this value usually hovers at around 1.2 Volts), which the computer also receives.
When testing this DC voltage MAF signal with your multimeter, the important thing to know is not an actual Volts DC value at a specific RPM, but to look for crazy and extreme fluctuations in the MAF voltage signal that don't correspond to the actual air intake (RPM) of the engine or NO SIGNAL AT ALL. In the TEST 3 section of this article, I'll show how you just how to test this so that you can confirm that your Nissan Maxima's MAF Sensor is bad or not.