Release coolant hose "2". Unlock the clamps "arrows" and remove the upper part of the air duct "1".
Unscrew the screws "arrow" on the left and right. Disconnect the lower part of the air duct "1" from the fasteners and remove. Remove the noise-insulating casing.
Loosen clamp "2" and remove the air hose from the intercooler. Pos. "1" can be ignored.
Release coolant hose "3". Disconnect connector "1" on boost pressure sensor -G31-. Unscrew screws "arrows". Loosen clamp "2" of air duct hose and remove air duct hose from throttle valve unit "J338". Remove air duct hose downwards.
Disconnect connector "1" from the throttle control unit "J338". Unscrew the screws "arrows" from below securing the throttle unit "J338" and remove the throttle unit "J338".
(Text obtained from the website www.SkodaBook.ru)
Installation
Installation in reverse order. Clean the used throttle valve unit "J338" before installation. Clean the mating surface of the sealing ring. Replace the sealing ring. After replacing the throttle valve unit "J338", it must be adapted to the engine control unit "J623".
Cleaning the throttle body "J338"
Note: After installing a new engine control unit - J623 - the throttle valve control unit must be adapted. Dirt/deposits on the throttle valve and its pipe, which change its end position, can lead to incorrect adaptation values. When cleaning, do not scratch the throttle valve housing.
Remove the throttle control unit "J338". Open the throttle valve by hand and lock the valve in the open position using a plastic or wooden wedge "arrow".
Thoroughly clean the throttle body, especially in the area of the closed valve "arrow", using regular acetone and tweezers.
Wipe the throttle body with a lint-free cloth. Allow the acetone to evaporate completely. Install the throttle control unit "J338". Erase the adaptation values and adapt the engine control unit "J623" to the throttle control unit "J338".