Checking intake system for leaks (unmetered air): VW Passat B5 2.3 (AZX)

🧭 Before you start

Fits: VW Passat B5 (3B)

• Special tools named: V.A.G 1551, V.A.G 1552

🔧 Engine codes this applies to

📋 Procedure

1. Connect fault reader V.A.G 1551 (V.A.G 1552). Start engine and select "“Address word”" 01 of engine control unit. (Connect fault reader and select engine control unit )
2. Press keys 0 and 8 for function "“Read measured value block”" and confirm entry with Q key.
3. Press keys 0, 0 and 1 for "“Display group number 1”" and confirm entry with Q key.
4. Check whether the coolant temperature is above 85°C in display zone 2.
5. Observe the engine speed in display zone 1 and Lambda control before catalytic converter in display zone 3. [Note: The display must hover around at least 0%. If 0 is constantly displayed, Lambda control has switched from regulation to control because a fault has occurred in Lambda regulation or probes are not yet operational. Read fault memory .]

6. Systematically spray parts of the intake system with engine leak detector spray.
7. Press → button.
8. Press buttons 0 and 6 for function "“End output”" and confirm entry with Q button.
9. Switch off ignition.
10. Check sprayed areas of intake system for leaks and rectify fault if necessary.
11. Press → button.
12. Press buttons 0 and 6 for function "“End output”" and confirm entry with Q button.
13. Switch off ignition.

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