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Removing and installing vacuum unit for turbocharger > < Removing and installing turbocharger

A4 Mk3

Checking vacuum unit for turbocharger
Checking vacuum unit for turbocharger
Special tools and workshop equipment required
   
t  Hand vacuum pump -VAS 6213-
Test condition:
t  Hose from turbocharger via charge pressure control solenoid valve -N75- to vacuum unit must not be blocked.
t  Charge pressure control solenoid valve -N75- OK.
Procedure:
  W00-10259
–  Remove engine cover panel -arrows-.
  A10-10719
–  Connect hand vacuum pump -VAS 6213- to vacuum unit -arrow-.
  N21-10114
–  Move adjuster ring -1- on hand vacuum pump -VAS 6213- to position -B- to select „pressure“.
  Caution
The pressure must not exceed 750 mbar. The vacuum unit could be damaged if the pressure is exceeded.
–  Operate hand vacuum pump -VAS 6213- several times and at the same time observe linkage.
The linkage -A- should start to move at a pressure of approx. 300 mbar and be at its limit stop at a pressure of approx. 700 mbar.
  N24-10282
The linkage should travel approx. 10 mm.
  Note
If it is not possible to build up pressure with hand vacuum pump -VAS 6213- or if the pressure drops again immediately, check hand vacuum pump -VAS 6213- and connecting hoses for leaks. If no fault is found: renew vacuum unit → Chapter.
  N21-10115

Removing and installing vacuum unit for turbocharger > < Removing and installing turbocharger