Checking cooling system testerV.A.G 1274 B (self-test) — AUDI

🧭 Before you start

Fits: Audi A3 (8V, 2012–2020)

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• Before discharging, check for leaks in the area around the fuel tank shut-off valve821Maintenance; Natural gas system: checking for damage and leaks.
• Do not leave the fuel tank unattended with the tester connected. — Check adapter and modify if it needs to be updated to the latest version .
• Hand wheel must be turned clockwise to close fuel tank shut-off valve.
• Ensure that the magnetic release tool T10349 is not attached to the fuel tank shut-off valve(1). — Check thread on fuel tank shut-off valve and on adapter for dirt and clean if necessary.

🔧 Engine codes this applies to

📋 Procedure

1. Observe safety precautions .
2. Observe rules for cleanliness .
3. Observe safety precautions when working on the natural gas system .
4. Check adapter and modify if necessary.
5. Remove fuel tank . [Note: Before discharging, check for leaks in the area around the fuel tank shut-off valve821Maintenance; Natural gas system: checking for damage and leaks.]

6. Drain fuel tank . [Note: Different types of fuel tank shut-off valve may be fitted.Depending on the version, the fuel tank shut-off valve may have one or two pipe connections.On fuel tank shut-off valves with two connections, both connections must be closed off using the adapter for checking residual pressure in natural gas tank and the additional sealing cap.]
7. ⚠ Do not leave the fuel tank unattended with the tester connected. — Check adapter and modify if it needs to be updated to the latest version .
8. Using hand wheel T50026, close mechanical shut-off valve on fuel tank shut-off valve(1).
9. Hand wheel must be turned clockwise to close fuel tank shut-off valve.
10. ⚠ In order to check the residual pressure correctly, a self-test must be performed first to check the cooling system testerV.A.G 1274 B and the adapter.If the results of the check are not satisfactory, the tools must NOT be used. — Disconnect any adapter lines connected to cooling system testerV.A.G 1274 B.
11. Operate cooling system testerV.A.G 1274 B several times.
12. Build up a pressure of 3.0 bar on cooling system testerV.A.G 1274 B.
13. Monitor pressure on pressure gauge of cooling system testerV.A.G 1274 B for 30 sec.
14. ⚠ Ensure that the magnetic release tool T10349 is not attached to the fuel tank shut-off valve(1). — Check thread on fuel tank shut-off valve and on adapter for dirt and clean if necessary.
15. Connect adapter(2) to cooling system testerV.A.G 1274 B(1).
16. Open cut-off valve on adapter.
17. Connect adapter(2) to fuel tank shut-off valve.
18. Operate cooling system testerV.A.G 1274 B several times.
19. Build up a pressure of 3.0 bar on cooling system testerV.A.G 1274 B.
20. Monitor pressure on pressure gauge of cooling system testerV.A.G 1274 B for 30 sec.
21. Check connection between fuel tank shut-off valve and adapter, and tighten if necessary.
22. Perform check (self-test) again .
23. Press the button for pressure equalisation on the cooling system testerV.A.G 1274 B. This will dissipate the pressure in the cooling system testerV.A.G 1274 B and the adapter.

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