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Inspect the vacuum system > < Adapt the engine control unit to the throttle valve control unit

Octavia Mk1

Test intake manifold changeover
Test intake manifold changeover
The test should only be undertaken when the performance is not up to specification
Test condition
l  Engine must be warm
Check for proper operation
–  Connect vehicle system tester -V.A.G 1552- and select address word 01 “Engine electronics”.
–  Start engine and run in idle.
–  Select 08 for the function “read measured value block” and further select display group 001.
–  Increase the engine speed suddenly (at least to 2500 rpm) and decelerate again.
   
–  The vacuum box for the intake manifold switch-over must pull in, the shift linkage must go back again to its initial position -arrow-.
If the change-over does not occur, perform the following tests:
–  Check variable intake manifold changeover valve -N156- (perform final control diagnosis → Chapter, if necessary check valve and actuation → Chapter).
–  Inspect vacuum lines for leaks → Chapter.
–  Inspect vacuum lines for proper connection, leaktightness and continuity.
–  Check smooth operation of changeover mechanism. (Operate shift linkage by hand.)
  S24-0414

Inspect the vacuum system > < Adapt the engine control unit to the throttle valve control unit