You can easily test the mass air flow (MAF) sensor on your 2002-2003 3.5L Nissan Maxima with a multimeter and in this tutorial I'll explain how.
I've also included an easy to read MAF sensor wiring diagram at the end of this tutorial to further help you.
Contents of this tutorial at a glance:
- Common Symptoms Of A BAD Nissan MAF Sensor.
- Circuit Descriptions Of The Nissan MAF Sensor Connector.
- TEST 1: Testing The MAF's Power (12 V) Circuit.
- TEST 2: Testing The MAF's Ground Circuit.
- TEST 3: Testing The 5 V Reference Signal.
- TEST 4: Testing The MAF Signal.
- MAF Sensor Wiring Diagram 2002-2003 3.5L Maxima.
Common Symptoms Of A BAD Nissan MAF Sensor
Here's a basic list of symptoms that your 3.5L Nissan Maxima will experience when the mass air flow sensor goes BAD:
- MAF Codes that light up the CHECK ENGINE LIGHT (CEL) on your instrument cluster.
- MAF sensor malfunction that DOES NOT light up the CHECK ENGINE LIGHT (CEL).
- Lean and/or Rich code(s).
- Fuel Trim code(s).
- A tremendous lack of power upon acceleration.
- Black smoke coming from the tail-pipe.
- BAD gas mileage.
- Vehicle may idle rough and stall.
Circuit Descriptions Of The Nissan MAF Sensor Connector
The mass air flow sensor, on the 2002-2003 3.5L Maxima has the intake air temperature (IAT) integrated into its assembly.
For this reason, you'll see 5 wires sticking out of its connector. You can see the MAF wiring diagram here: MAF Sensor Wiring Diagram 2002-2003 3.5L Maxima.
Here's a brief description of each one:
|MAF Sensor Circuits (2002-2003 3.5L Nissan Maxima)|
|2||RED||5 Volts DC|
I recommend using a wire-piercing probe to test the signals in the wires, since this method will be the most effective and easiest way of getting to the signal. 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.