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Adapting EGR valve > < Test conditions

Octavia Mk1

Procedure
Procedure
–  Connect vehicle system tester - V.A.G 1552-. Switch on the ignition and select the engine control unit with “Address word” 01 → Chap. 01-1.
–  Select function 04 “Basic setting” and display group number 060.
After pressing Q, the throttle valve positioner is switched dead.
In this condition the throttle valve is drawn into emergency operation position by a mechanical spring located in the throttle valve control unit -J338-. The values generated by the two angle senders in this emergency position are stored by the engine control unit.
Subsequently the throttle valve is opened at a given value. If this value is reached, the throttle valve positioner is again switched dead. Now the mechanical spring must close the throttle valve within a given period in the previously initialised emergency position (spring test).
The throttle valve is subsequently closed by the throttle valve positioner: the values sent by the angle sender to the throttle valve control unit -J338- are stored in the engine control unit.
If the engine control unit switches the throttle valve positioner dead during driving operation, this is indicated by an increased, saw-toothed idling speed. The engine accelerates with a considerable delay.
   
Readout on display:
–  Check the nominal value for the throttle valve control unit -J338- in display field 4.
  
System in basic setting 60
10.5 %    89.0 %       8      ADP. running
Readout on display:
Specified value display field 4:
   ADP. runs
ADP. o.k.
  Note
The abbreviation “ADP” in display field 4 stands for “Adaption”, which in fact means adaptation.
If the adaptation is aborted by the control unit, this may be due to the following reasons:
t  The throttle valve cannot be fully closed (e.g. dirt).
t  The battery voltage is too low.
t  The engine is started during the adaptation or the accelerator pedal is pressed.
t  Warping of the throttle valve housing (check screwed connection).
t  After the abortion the tester displays “function unknown or cannot be performed”. When the ignition is switched on again (a few seconds) the adaptation is automatically performed again.
–  End the basic setting of the engine by pressing →.
  
System in basic setting 60
10.5 %    89.0 %       0       ADP o.k.
Readout on display:
  
Vehicle system test                 HELP
Select function XX

Adapting EGR valve > < Test conditions