Volkswagen Cars 2000-05

Mass Air Flow (MAF) Sensor

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Removal & Installation



All Except Passat 2.0L
  1. Turn the ignition switch to the OFF position.
  2.  
  3. Disconnect the Intake Air Temperature sensor harness electrical connector.
  4.  
  5. Using a suitable tool, remove Intake Air Temperature sensor.
  6.  
  7. Installation is in reverse order of removal.
  8.  

Testing



1.8L, 2.7L, 2.8L

NOTE
For this check, all electrical accessories should be switched off (coolant fan must not run during test). Ensure the fuse for the MAF sensor is OK.

  1. Connect a VAG 1551 or VAG 1552 scan tool and press buttons '0' and '1' to insert 'Engine Electronics' address word 01 (with engine running at idle).
  2.  
  3. Press buttons '0' and '8' to select 'Read Measuring Value Block' function 08 , and press 'Q' button to confirm input.
  4.  
  5. Press buttons '0', '0' and '2' to input display group number 2 , and press the 'Q' button to confirm input.
  6.  
  7. Compare the display with the specified values for engine load.
  8.  



Click image to see an enlarged view

Fig. Showing the MAF sensor connector

  1. Disconnect the 3-pin harness connector from the MAF sensor.
  2.  
  3. Connect a DMM between harness connector terminal 3 and engine ground, using adapter cables from VW1594 connector test kit.
  4.  
  5. Switch the ignition to 'ON' and measure the voltage. It should be 11.5 volts.
  6.  
  7. Switch ignition to 'OFF'.
  8.  

If the voltage specification is not attained, check the wiring from terminal 3 to fuse panel, using an applicable wiring diagram.

  1. Connect a VAG1598/22 test box to the ECM harness connector.
  2.  
  3. Check wiring for open circuits between the ECM/test box and the 3-pin MAF sensor harness connector. Check at the following points:
  4.  


    Connector terminal 1 to ECM test box socket 13
     
    Connector terminal 2 to ECM test box socket 12
     


The value should be a maximum resistance of 1.5 ohms at each test point.

  1. If not, check the wiring for short circuits between terminals of 3-pin connector. The DMM should show infinite ohms.
  2.  
  3. If the voltage supply and wiring are OK, replace the Mass Airflow (MAF) sensor-G70.
  4.  

 
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