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Golf Mk4

Cleaning throttle valve moduleJ338
Cleaning throttle valve module -J338-
  Note
t  If a new engine control unit is installed the throttle valve module -J338- must be adapted. Adaption must only be performed with a new or cleaned throttle valve module, because soiling/coking in closed throttle valve can lead to incorrect adaption values.
t  When cleaning the throttle valve housing it must not be scratched.
–  Remove intake hose → Item.
–  Remove throttle valve module -J338-.
   
–  Open throttle valve by hand and lock in open position using a suitable object (e.g. wood or plastic wedge) -arrow-.
  WARNING
Acetone is highly inflammable. Please observe the accidental regulations and safety notes when handling with highly inflammable fluids. Do not use compressed air when cleaning the throttle valve. Wear protective glasses and clothing to avoid injuries and skin contact.
  N24-10125
–  Thoroughly clean throttle valve housing, especially around the closed throttle valve -arrows- using commercially available acetone according to DIN 53247 and a cleaning brush.
–  Wipe off throttle valve housing using a lint-free cloth.
–  Wait until the acetone is fully evaporated and reinstall the cleaned throttle valve module -J338-.
–  Adapt the engine control unit to throttle valve module -J338- → Vehicle diagnosis, testing and information system VAS 5051.
  N24-10124

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