volkswagen Workshop Repair Guides

Volkswagen Polo Workshop and Repair Manuals

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Safety precautions > < Removing and installing air filter housing

Cleaning throttle valve module J338 - Mixture preparation for Polo Mk5 4-cyl injection engine

Cleaning throttle valve moduleJ338
Cleaning throttle valve module -J338-
  Note
t  If a new engine control unit is installed the throttle valve module must be adapted. Adaption must only be performed with a new or cleaned throttle valve module, because soiling/carbon deposits in closed throttle valve can lead to incorrect adaption values.
t  When cleaning the throttle valve housing it must not be scratched.
–  Remove air filter housing → Chapter.
–  Remove throttle valve module.
   
–  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 eye protection and protective clothing to avoid injuries and skin contact.
  N24-10125
–  Thoroughly clean throttle valve housing, especially around closed throttle valve -arrows-, using commercially available acetone to DIN 53247 standard 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.
–  Adapt the engine control unit to throttle valve module → Vehicle diagnosis, testing and information system VAS 5051“Guided functions”.
  N24-10124

Safety precautions > < Removing and installing air filter housing