Mazda Car 2002-04

Mass Air Flow (MAF) Sensor

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Operation



The Mass Air Flow (MAF) sensor directly measures the amount of the air flowing into the engine. The sensor is mounted between the air cleaner assembly and the air cleaner outlet tube.

The sensor utilizes a hot wire-sensing element to measure the amount of air entering the engine. The sensor does this by sending a signal, generated by the sensor when the incoming air cools the hot wire down, to the PCM. The signal is used by the PCM to calculate the injector pulse width, which controls the air/fuel ratio in the engine. The sensor and plastic housing are integral and must be replaced if found to be defective.

The sensing element (hot wire) is a thin platinum wire wound on a ceramic bobbin and coated with glass. This hot wire is maintained at 392°F (200°C) above the ambient temperature as measured by a constant -cold wire''.

The Mass Air Flow (MAF) sensor directly measures the amount of the air flowing into the engine. The sensor is mounted between the air cleaner assembly and the air cleaner outlet tube.

The sensor utilizes a hot wire-sensing element to measure the amount of air entering the engine. The sensor does this by sending a signal, generated by the sensor when the incoming air cools the hot wire down, to the PCM. The signal is used by the PCM to calculate the injector pulse width, which controls the air/fuel ratio in the engine. The sensor and plastic housing are integral and must be replaced if found to be defective.

The sensing element (hot wire) is a thin platinum wire wound on a ceramic bobbin and coated with glass. This hot wire is maintained at 392°F (200°C) above the ambient temperature as measured by a constant -cold wire''.

The Mass Air Flow (MAF) sensor directly measures the amount of the air flowing into the engine. The sensor is mounted between the air cleaner assembly and the air cleaner outlet tube.

The sensor utilizes a hot wire-sensing element to measure the amount of air entering the engine. The sensor does this by sending a signal, generated by the sensor when the incoming air cools the hot wire down, to the PCM. The signal is used by the PCM to calculate the injector pulse width, which controls the air/fuel ratio in the engine. The sensor and plastic housing are integral and must be replaced if found to be defective.

The sensing element (hot wire) is a thin platinum wire wound on a ceramic bobbin and coated with glass. This hot wire is maintained at 392°F (200°C) above the ambient temperature as measured by a constant -cold wire''.

The Mass Air Flow (MAF) sensor directly measures the amount of the air flowing into the engine. The sensor is mounted between the air cleaner assembly and the air cleaner outlet tube.

The sensor utilizes a hot wire-sensing element to measure the amount of air entering the engine. The sensor does this by sending a signal, generated by the sensor when the incoming air cools the hot wire down, to the PCM. The signal is used by the PCM to calculate the injector pulse width, which controls the air/fuel ratio in the engine. The sensor and plastic housing are integral and must be replaced if found to be defective.

The sensing element (hot wire) is a thin platinum wire wound on a ceramic bobbin and coated with glass. This hot wire is maintained at 392°F (200°C) above the ambient temperature as measured by a constant -cold wire''.

The Mass Air Flow (MAF) sensor directly measures the amount of the air flowing into the engine. The sensor is mounted between the air cleaner assembly and the air cleaner outlet tube.

The sensor utilizes a hot wire-sensing element to measure the amount of air entering the engine. The sensor does this by sending a signal, generated by the sensor when the incoming air cools the hot wire down, to the PCM. The signal is used by the PCM to calculate the injector pulse width, which controls the air/fuel ratio in the engine. The sensor and plastic housing are integral and must be replaced if found to be defective.

The sensing element (hot wire) is a thin platinum wire wound on a ceramic bobbin and coated with glass. This hot wire is maintained at 392°F (200°C) above the ambient temperature as measured by a constant -cold wire''.

The Mass Air Flow (MAF) sensor directly measures the amount of the air flowing into the engine. The sensor is mounted between the air cleaner assembly and the air cleaner outlet tube.

The sensor utilizes a hot wire-sensing element to measure the amount of air entering the engine. The sensor does this by sending a signal, generated by the sensor when the incoming air cools the hot wire down, to the PCM. The signal is used by the PCM to calculate the injector pulse width, which controls the air/fuel ratio in the engine. The sensor and plastic housing are integral and must be replaced if found to be defective.

The sensing element (hot wire) is a thin platinum wire wound on a ceramic bobbin and coated with glass. This hot wire is maintained at 392°F (200°C) above the ambient temperature as measured by a constant -cold wire''.

Removal & Installation



  1. Remove the air cleaner outlet tube.
  2.  
  3. Disconnect the MAF sensor electrical connector.
  4.  
  5. Remove the attaching four nuts and the MAF sensor.
  6.  
  7. Installation is the reverse of the removal procedure.

    Click image to see an enlarged view

    Fig. Removing the MAF sensor

  8.  

  1. Remove the air cleaner outlet tube.
  2.  
  3. Disconnect the MAF sensor electrical connector.
  4.  
  5. Remove the attaching four nuts and the MAF sensor.
  6.  
  7. Installation is the reverse of the removal procedure.

    Click image to see an enlarged view

    Fig. Mass airflow sensor removal and installation

  8.  

  1. Remove the air cleaner outlet tube.
  2.  
  3. Disconnect the MAF sensor electrical connector.
  4.  
  5. Remove the attaching four nuts and the MAF sensor.
  6.  
  7. Installation is the reverse of the removal procedure.

    Click image to see an enlarged view

    Fig. Mass airflow sensor removal and installation

  8.  

  1. Remove the air cleaner outlet tube.
  2.  
  3. Disconnect the MAF sensor electrical connector.
  4.  
  5. Remove the attaching four nuts and the MAF sensor.
  6.  
  7. Installation is the reverse of the removal procedure.

    Click image to see an enlarged view

    Fig.

  8.  

  1. Remove the air cleaner outlet tube.
  2.  
  3. Disconnect the MAF sensor electrical connector.
  4.  
  5. Remove the attaching four nuts and the MAF sensor.
  6.  
  7. Installation is the reverse of the removal procedure.

    Click image to see an enlarged view

    Fig.

  8.  

  1. Remove the air cleaner outlet tube.
  2.  
  3. Disconnect the MAF sensor electrical connector.
  4.  
  5. Remove the attaching four nuts and the MAF sensor.
  6.  
  7. Installation is the reverse of the removal procedure.

    Click image to see an enlarged view

    Fig.

  8.  

Testing



  1. Back probe terminal B (center wire) of the air flow sensor electrical connector using a high impedance volt meter.
  2.  
  3. Connect the other terminal of the meter to ground.
  4.  
  5. Turn the ignition switch to the ON position.
  6.  
  7. The meter should read 1.0-1.5 volts.
  8.  
  9. Start the engine and allow to idle.
  10.  
  11. The voltmeter should read 1.5-2.5 volts.
  12.  
  13. If the readings are not as specified, replace the sensor.
  14.  

4-Cyl.
  1. Turn the ignition switch to ON position.
  2.  
  3. Using a suitable scan tool, monitor the following. Standard value:

    AT-2.2-3.10 g/s at idle
     
    AT-8.7-9.8 g/s at 2500 rpm
     
    MT-1.9-3.0 g/s at idle
     
    MT-6.7-9.1 g/s at 2500 rpm
     

  4.  
  5. If not as specified, the MAF sensor must be replaced.
  6.  

V6
  1. Turn the ignition switch to ON position.
  2.  
  3. Using a suitable scan tool, monitor the following. Standard value:

    AT-2.9-3.7 g/s at idle
     
    AT-9.9-12.7 g/s at 2500 rpm
     
    MT-2.9-3.7 g/s at idle
     
    MT-9.9-12.1 g/s at 2500 rpm
     

  4.  
  5. If not as specified, the MAF sensor must be replaced.
  6.  

 
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