Checking secondary air system: VW Passat B5 (AVU, AYL, AZX)

🧭 Before you start

Fits: VW Passat B5 (3B)

• Special tools named: V.A.G 1552

Don't miss

• No engine loading may be created during this diagnosis, otherwise the test will be terminated and can only be reinitiated after switching the ignition off and on again and performing a road test.

🔧 Engine codes this applies to

📋 Procedure

1. Connect fault readerV.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: General notes for self-diagnosis01Connecting fault reader.
2. Press keys 0 and 4 for function "„Initiate basic settings“" and confirm entry with Q key.
3. Press buttons 00 and 1 for "„display group number 1“" and confirm entry with Q button.
4. Change to display group 77 as follows:
5. Press the C button.

6. Press buttons 07 and 7 for "„display group number 77“" and confirm entry with Q button. [Note: No engine loading may be created during this diagnosis, otherwise the test will be terminated and can only be reinitiated after switching the ignition off and on again and performing a road test.]
7. Leave engine running at idle until the specification "„Syst. OK“" is displayed in display zone 4.
8. Press → button.
9. Press buttons 0 and 6 for function "„End output“" and confirm entry with Q button.
10. Switch off ignition.
11. Initiate final control diagnosis and select secondary air inlet valve N112 and secondary air pump relay J299: Final control diagnosis01Performing final control diagnosis.
12. Check secondary air pump motor .
13. Check combination valve .

Other VW procedures

• Checking for leaks – Audi A3
• Removing: – Audi A3 1.6
• Checking exhaust gas recirculation potentiometer G212 – VW
• Removing and installing intake manifold (bottom section)
• Checking catalytic converter – VW Passat B5
• Removing engine · 41 torque figures
• Removing and installing camshaft – VW Golf Cabriolet · 47 torque figures
• Adjusting valve timing – VW Passat B5 · 83 torque figures
• Removing and installing camshafts – VW Passat B6 · 39 torque figures
• Removing and installing coolant pump · 53 torque figures