Sentra 2008

Mass Air Flow Sensor

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Location



Specific to:

Nissan Sentra 2007-2012



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Fig. In all models, the Mass Air Flow (MAF) sensor is in the air filter housing-2.5L engine shown

Testing



Specific to:

Nissan Sentra 2007-2012

  1. Turn ignition switch OFF and wait at least 10 seconds before going to the next step.
  2.  
  3. Confirm that battery voltage is more than 11V with the engine at idle.
  4.  
  5. Start engine and warm it up to normal operating temperature.
  6.  
  7. Let it idle for 2 minutes and check for 1st trip DTC. If there is no code, the sensor is working properly or the problem is intermittent. Check the sensor power and ground circuits. Both ground and reference voltage (5 volts) are supplied by the ECM.
    WARNING
    Connect the voltmeter ground probe to engine or chassis ground. Do not test circuits with the meter connected to the battery or the ECM may be damaged.

  8.  
  9. Connect a scan tool and read live data.
  10.  
  11. Increase engine speed and check the MAF sensor voltage. It should increase relatively linearly as engine speed increases. Voltage should be:

    2.0L engine: 0.9-1.2 volts at idle, 1.5-1.8 volts at 2500 rpm
     
    2.5L engine: 0.9-112 volts at idle, 1.4-1.7 volts at 2500 rpm
     

  12.  

Operation



Specific to:

Nissan Sentra 2007-2012

The Mass Air Flow (MAF) sensor has a thin wire extended into the air stream flowing into the engine. The sensor uses electric current to heat the wire to a specific temperature. As air flowing past the wire cools it, more current is required to maintain the predetermined temperature. The ECM detects the air flow by measuring this current change.

Removal & Installation



Specific to:

Nissan Sentra 2007-2012

The Mass Air Flow (MAF) sensor has a thin wire extended into the air stream flowing into the engine. The sensor uses electric current to heat the wire to a specific temperature. As air flowing past the wire cools it, more current is required to maintain the predetermined temperature. The ECM detects the air flow by measuring this current change.

 
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