Audi TT (2007 year). Manual - part 53

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not 
 permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability 
     with respect to the correctness of information in this document. Copyright by AUDI AG.

Note

A replacement part set is available ⇒  Electronic parts catalogue

for renewing the vacuum unit with position sender for charge

pressure positioner -G581- .

Removing
– Remove air cleaner housing with air mass meter and connect‐

– Press release tabs and disconnect crankcase breather con‐

necting pipe -1- from cylinder head cover.

– Move clear vacuum hoses -arrows-.
– Unscrew captive bolt -2-, swivel air pipe with connection to rear

and detach from turbocharger.

– Seal opening on turbocharger with sealing cap from replace‐

ment part set.

– Detach heat shield sleeve around electrical connector -1-.
– Unplug electrical connector -1- at position sender for charge

pressure positioner -G581- .

– Detach vacuum hose -2- from vacuum unit of turbocharger.

– Depending on version, remove nut -arrow- securing oil supply

line/vacuum line to cylinder head.

1. Turbocharger    

203

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not 
 permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability 
     with respect to the correctness of information in this document. Copyright by AUDI AG.

Make an improvised tool (14 mm) to counterhold connection for

oil supply line, as shown.
♦ A = 110 mm
♦ B = 25 mm

Caution

It is important that you counterhold connection when loosening

oil supply line. Risk of further damage occurring later.

– Counterhold connection using improvised tool and remove oil

supply line -arrow- from turbocharger.

– Seal opening for oil supply line in turbocharger with plug from

replacement part set.

– Counterhold lock nut -B- with ring spanner -T10423- and re‐

move securing nut -A- from control rod using socket -T10422- .

– Unscrew bolts -arrows- securing vacuum unit and detach vac‐

uum unit -A-.

Installing

Caution

Only use new bolts and nuts from replacement part set.

– If necessary, remove bottom nut securing control rod from new

vacuum unit.

– Screw lock nut on control rod by hand as far as stop towards

vacuum unit.

– Guide control rod through adjusting lever on turbocharger, fit

vacuum unit -A- and secure bolts.

204

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not 
 permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability 
     with respect to the correctness of information in this document. Copyright by AUDI AG.

– Tighten securing bolts -arrows- to 8 Nm.

Note

Please ensure that guide can be moved easily on control rod.

– Remove protective cap, fit oil supply line -arrow- on turbo‐

charger and tighten to 22 Nm.

– Plug in connector -2- at position sender for charge pressure

positioner -G581- and fasten heat shield sleeve.

– Connect vehicle diagnostic tester .
Selecting operating mode:
– On touch screen, press button for “Vehicle self-diagnosis”.
Selecting vehicle system:
– On touch screen, press button for “01 - Engine electronics”.
The display will show the identification and coding of the engine

control unit.
Selecting diagnostic function:
– On touch screen, press button for “011 - Measured values”.
– On the numeric keypad, enter measured value block “120” and

confirm your entry with “Q” key.

– Connect hand vacuum pump -VAS 6213- to vacuum unit.
– Create voltage of 0.760 V by generating a vacuum (observe

minimum value of measured value block).

Caution

During the following adjustment procedure for the control rod,

the vacuum and the voltage of 0.760 V must be maintained.

1. Turbocharger    

205

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not 
 permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability 
     with respect to the correctness of information in this document. Copyright by AUDI AG.

– Slowly screw lock nut -B- for control rod downwards by hand.

Adjusting lever is on bottom stop.

– Counterhold lock nut -B- and screw securing nut -A- on control

rod against adjusting lever. Tighten slightly using ring spanner

-T10423- .

– Release vacuum pressure from vacuum unit.
– Observe minimum value of measured value block: value of

3.30 ... 3.90 V should be displayed (unpressurised).

– Apply socket -T10422- , counterhold lock nut -B- using ring

spanner -T10423- and tighten securing nut -A-.

Caution

Create vacuum of 0.75 ± 0.05 bar for vacuum unit to ensure

that adjusting lever is positioned at stop. A voltage of 0.760 V

should build up.

Voltage value OK

– Press locking plate onto control rod by hand and turn by 90°

in direction of -arrow-.

– Seal connection between control rod and securing nut with

sealing paint from replacement part set.

Voltage value not OK

– Counterhold lock nut -B-, loosen securing nut -A- on control

rod and adjust value by turning lock nut -B-.

– Counterhold lock nut -B-, screw securing nut -A- in other di‐

rection and tighten connection using socket -T10422- .

– Press locking plate onto control rod by hand and turn by 90°

in direction of -arrow-.

– Seal connection between control rod and securing nut with

sealing paint from replacement part set.

Continued

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