Self test of cooling system testerV.A.G 1274 B, engine code BSX — VW

🧭 Before you start

Fits: VW Touran I (1T, 2003–2015)

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• Perform a leakage test in the area around the fuel tank shut-off valve before emptying the fuel tank 00Checking gas system; Checking gas system for leaks.
• Never leave the fuel tank unattended when the tester is connected. — Check adapter for back pressure test on natural gas tank, and convert it to new version, if necessary .

🔧 Engine codes this applies to

📋 Procedure

1. Observe safety precautions .
2. Observe rules for cleanliness .
3. Observe safety precautions when working on natural gas system .
4. Check adapter for back pressure test on natural gas tank, and convert it accordingly, if necessary.
5. Remove fuel tank . [Note: Perform a leakage test in the area around the fuel tank shut-off valve before emptying the fuel tank 00Checking gas system; Checking gas system for leaks.]

6. Draining fuel tank [Note: Different fuel tank shut-off valves may be installed.Depending on the version of the fuel tank shut-off valve installed, 1 or 2 line connections may be present.In the case of fuel tank shut-off valves with 2 connections, each of the connections must be sealed using the adapter for back pressure check on natural gas tank and an additional sealing cap.]
7. ⚠ Never leave the fuel tank unattended when the tester is connected. — Check adapter for back pressure test on natural gas tank, and convert it to new version, if necessary .
8. Close mechanical shut-off valve (2) on fuel tank shut-off valve using a suitable wrench (SW 6).
9. Close shut-off valves by turning hand wheel in clockwise direction.
10. ⚠ In order to ensure that the back pressure test is performed correctly, always check the cooling system testerV.A.G 1274 B and the adapter for back pressure test on natural gas tank (self test) beforehand.If the self test fails, the tools must not be used. — Disconnect any adapter lines from 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. Observe pressure on pressure gauge of cooling system testerV.A.G 1274 B for 30 seconds.
14. ⚠ Ensure that the magnetic release tool T10349 is not placed on the fuel tank shut-off valve(1). — Check threads on fuel tank shut-off valve and on adapter for back pressure test on natural gas tank for soiling, and clean them if necessary.
15. Connect adapter for back pressure test on natural gas tank(2) to cooling system testerV.A.G 1274 B(1).
16. Open shut-off tap (arrow) on adapter for back pressure test on natural gas tank.
17. Connect adapter for back pressure test on natural gas tank(2) to fuel tank shut-off valve(1).
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. Observe pressure on pressure gauge of cooling system testerV.A.G 1274 B for 30 seconds.
21. Check connection between fuel tank shut-off valve and adapter for back pressure test on natural gas tank, and tighten it if necessary.
22. Repeat self test .
23. Press the pressure compensation button on the cooling system testerV.A.G 1274 B. This will cause the pressure in the cooling system testerV.A.G 1274 B and the adapter for back pressure test on natural gas tank to be released.

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