Test solenoid valve 1 for activated charcoal filter — VW

🧭 Before you start

Fits: VW Passat B5 (3B)

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

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• No engine loading may be created during this diagnosis, otherwise the test will be terminated and can only be reinitiated by a bust of the throttle.
• TBV is the abbreviation for: tank breather valve (activated charcoal filter system solenoid valve 1).

🔧 Engine codes this applies to

📋 Procedure

1. First check activation of activated charcoal filter solenoid 1 (tank breather valve) using final control diagnosis: Repair group 01; Final control diagnosis; Performing final control diagnosis.
2. Perform check of functions.
3. 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: Repair group 01; General notes for self-diagnosis; Connecting fault reader.
4. Press keys 0 and 4 for function "„Initiate basic settings“" and confirm entry with Q key.
5. Press buttons 00 and 1 for "„display group number 1“" and confirm entry with Q button.

6. Change to display group 70 as follows:
7. Press the C button.
8. Press buttons 07 and 0 for "„display group number 70“" 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 by a bust of the throttle.]
9. Leave engine running at idle until the specification "„TBV OK“" is displayed in display zone 4. [Note: TBV is the abbreviation for: tank breather valve (activated charcoal filter system solenoid valve 1).]
10. Press → button.
11. Press buttons 0 and 6 for function "„End output“" and confirm entry with Q button.
12. Switch off ignition.
13. Check breather lines to activated charcoal filter are not kinked.
14. Check fuel tank venting .

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