Audi Workshop Service and Repair Manuals

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:

–  Vehicles with auxiliary heater: remove bolts -arrows- securing exhaust pipe for auxiliary/additional heater to noise insulation.

–  Release quick-release fasteners -1- and -2- and take off front noise insulation.

–  Connect hand vacuum pump -VAS 6213- to vacuum unit -arrow-.

–  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. 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.