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Checking overrun shut-off valve > < Checking charge pressure regulation

Golf Mk4

Checking charge pressure regulating valve pressure actuator
Checking charge pressure regulating valve pressure actuator
Special tools and workshop equipment required
t  Fault reader -V.A.G 1551- or vehicle system tester -V.A.G 1552- with diagnosis cable -V.A.G 1551/3C-
Test prerequisite
l  Engine oil temperature at least 60 °C.
l  No leaks on intake and exhaust systems
Test procedure
   
–  Pull connector -2- off charge pressure regulation solenoid valve -N75--1-.
  N21-0077
–  Start engine and increase to maximum rpm by flooring throttle. The charge pressure regulating valve operating rod -2- must move.
If the operating rod does not move:
–  Check charge pressure regulating valve lever -1- for ease of movement. If corroded (seized), renew turbocharger.
If the operating rod does not move, even though the lever is free to move:
–  Renew exhaust turbocharger → Item.
  N21-0075

Checking overrun shut-off valve > < Checking charge pressure regulation