Hyundai_Tucson_2005

Mass Air Flow (MAF) Sensor

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Operation



The MAF is measured by detection of heat transfer from a hot film probe because the change of the mass air flow rate causes change in the amount of heat being transferred from the hot film probe surface to the air flow. The air flow sensor generates a pulse so it repeatedly opens and closes between the voltage (5V) supplied from the ECM. This results in a change of the temperature of the hot film probe and in the change of resistance.

Location



This sensor is located in the air intake plenum assembly, between the air cleaner assembly and the throttle body.

Removal & Installation



  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the connector from the sensor.
  4.  
  5. Remove the air cleaner and air intake assembly, as required.
  6.  
  7. Remove the sensor from its mounting.
  8.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  

Testing



2.0L Engine
  1. Turn the engine ON.
  2.  
  3. Install the scan tool and monitor the MASS AIR FLOW parameter on the scan tool data list.
  4.  
  5. Specification should be approximately 10-20 kg/h at idle and no load.
  6.  
  7. If within specification, check for poor connection between the PCM and the component.
  8.  
  9. If not, substitute the sensor with a known good component, check for proper operation. If problem corrected replace the sensor.
  10.  

2.7L Engine
  1. Connect the scan tool and monitor the MASS AIR FLOW (V) parameter on the scan tool data list.
  2.  
  3. Monitor the MASS AIR FLOW (V) parameter on the scan tool.
  4.  
  5. Specification is approximately 0.6-1.0 volt at idle (no load) and approximately 1.0-1.3 volt at idle (air conditioning ON).
  6.  
  7. If within specification, check for poor connection between the ECM and the component.
  8.  
  9. If not, substitute the sensor with a known good component, check for proper operation. If problem corrected replace the sensor.
  10.  

 
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