Checking linkage and vacuum unit for charge pressure control — AUDI

🧭 Before you start

Fits: Audi A6 C5 (4B)

• Renewed: turbocharger

Don't miss

• The absolute pressure displayed on the turbocharger testerV.A.G 1397 A should decrease by the specified values given.
• Observe the movement of the linkage over the complete range of travel. It should move steadily and smoothly.

🔧 Engine codes this applies to

📋 Procedure

1. Pull dipstick (1) out of guide tube.
2. Unclip cover caps.
3. Unfasten nuts (arrows) and detach engine cover.
4. Remove insulation beneath cover.
5. Re-insert dipstick in guide tube.

6. Unscrew bolts (arrows).
7. Remove air ducts (1) and (2).
8. Switch on turbocharger testerV.A.G 1397 A and set range switch to position (I) (absolute pressure).
9. Attach test hose to hose connection (I).
10. Disconnect hose (arrow) from vacuum unit for charge pressure control.
11. Connect the hand-operated vacuum pumpV.A.G 1390 and turbocharger testerV.A.G 1397 A using test hoses as shown in illustration.
12. Create vacuum with hand-operated vacuum pump.
13. Read the vacuum value on turbocharger testerV.A.G 1397 A.
14. Also observe linkage at turbocharger. [Note: The absolute pressure displayed on the turbocharger testerV.A.G 1397 A should decrease by the specified values given.]
15. Vent hand vacuum pump. [Note: Observe the movement of the linkage over the complete range of travel. It should move steadily and smoothly.]
16. Renew turbocharger; vehicles with engine code letters AJM , vehicles with engine code letters AVF, AWX .

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