Checking solenoid valve 1 for activated charcoal filter system — VW

🧭 Before you start

Fits: VW Golf IV / Bora (1J)

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• During the diagnosis, no load should be placed on the engine as otherwise the diagnosis will be cancelled and can only be initiated again after revving up (in one short, sharp movement).
• TVV means tank vent valve (activated charcoal filter system solenoid valve 1N80).

🔧 Engine codes this applies to

📋 Procedure

1. Connect fault readerV.A.G 1551 or vehicle system testerV.A.G 1552 or vehicle diagnosis and service information systemVAS 5052. Then start the engine and select the engine control unit with "“Address word”" 01. Connecting fault reader and selecting engine control unit: 01.
2. Press keys 0 and 8 for function "“Read measured value block”" and confirm entry with Q key.
3. Press keys 07 and 0 for "“Display group number 70”" and confirm entry with Q key.
4. Press key 4 for function "“Basic setting”" ("“tank vent valve diagnosis”" will be initiated) [Note: During the diagnosis, no load should be placed on the engine as otherwise the diagnosis will be cancelled and can only be initiated again after revving up (in one short, sharp movement).]
5. Leave engine running at idle until there is a reading in display zone 4 showing the result of the short test. Specification: "“TVV OK”". [Note: TVV means tank vent valve (activated charcoal filter system solenoid valve 1N80).]

6. Press the → key.
7. Press keys 0 and 6 for function "“End output”" and confirm entry with Q key.
8. Switch off ignition.
9. Initiate final control diagnosis and activate control element for activated charcoal filter system solenoid valve 1N80: 01.
10. Check breather lines to activated charcoal filter are not kinked.
11. Check fuel tank venting .

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