Audi TT (2007 year). Manual - part 54

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.

– Depending on version, fit nut -arrow- securing oil supply line/

vacuum line to cylinder head and tighten connection.

– Remove sealing cap from turbocharger.
– Fully assemble engine components.
– Start engine and erase fault memory ⇒ Vehicle diagnosis,

testing and information system VAS 5051.

– Check adjustment as follows:
Selecting diagnostic function:
– On touch screen, press button for “006 - Basic setting”.
– On the numeric keypad, enter measured value block “120” and

confirm your entry with “Q” key.

– On bottom half of touch screen, press button for “Activate”.
– Observe value on bottom part of display: value should fluctu‐

ate between 0.65 ... 0.85 V and 3.30 ... 3.90 V (vacuum unit is

moved to both limit stops alternately).

Voltage values OK:
– Exit basic setting.

1. Turbocharger    

207

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.

2

Charge air cooling

Note

♦

Check that all air pipes and hoses and vacuum lines are cor‐

rectly fitted and that there are no leaks before carrying out tests

or repairs.

♦

Hose connections and air pipes and hoses must be free of oil

and grease before assembly.

♦

Secure all hose connections with the correct type of hose clips

(same as original equipment) ⇒  Electronic parts catalogue .

♦

To ensure that the air hoses can be properly secured at their

connections, spray rust remover onto the worm thread of used

hose clips before installing.

2.1

Charge air cooler - exploded view

1 - Air hose
2 - Sleeve
3 - Bolt

❑ 9 Nm

4 - Air pipe (left-side)
5 - Seal
6 - Air hose

❑ Removing 

⇒ page 209

❑ Installing 

⇒ page 209

7 - Charge air cooler

❑ Removing and installing

⇒ page 211

8 - Seal
9 - Mounting
10 - Bolt

❑ 5 Nm

11 - Mounting
12 - Air hose

❑ Removing 

⇒ page 209

❑ Installing 

⇒ page 209

13 - Air hose
14 - Air pipe
15 - O-ring

❑ Renew

16 - Charge pressure sender -

G31- / intake air temperature

sender -G42-

❑ Removing and installing 

⇒ page 210

17 - Bolt

❑ 5 Nm

208

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.

18 - Bolt

❑ 9 Nm

19 - Sleeve
20 - Grommet

❑ Renew if damaged

21 - Grommet

❑ Renew if damaged

Removing air hoses with plug-in connectors
– Release tab -A- on plug-in connector by lifting retaining clip

-arrow-.

– Disconnect air pipes and hoses by hand (do not use a tool).

Installing air hoses with plug-in connectors

Note

♦

Renew seal if damaged.

♦

Make sure that the seal is correctly seated in the groove on

the complete circumference of the air pipe/hose.

♦

Apply a thin coating of silicon-free lubricant to the sealing area

and the seal.

– Release retaining clip (position -1-).
– Push air pipe/hose in as far as stop and press retaining clip to

lock -2-.

– Press air pipe/hose again and pull again to check that plug-in

connector is correctly engaged.

2. Charge air cooling    

209

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.

2.2

Removing and installing charge pres‐

sure sender -G31- / intake air tempera‐

ture sender -G42-

Removing
– Release fasteners -1 ... 4- and remove centre noise insulation.

– Release hose clip -2-, lift retaining clip -1- and remove air hose.

– Remove bolts -arrows-.
– Move coolant hose -3- clear.
– Loosen hose clip -2-.
– Unplug electrical connector -1- at charge pressure sender -

G31- and detach air pipe (front).

210