Checking gas system for leaks: Audi 2.0 (BSX, CPWA)

🧭 Before you start

Fits: VW Caddy III (2K, 2004–2015); platform code 2C0

🔧 Engine codes this applies to

📋 Procedure

1. Determine pressure in natural gas system. Determining pressure in gas system [Note: The gas shut-off valves are closed electrically upon pulling out the relay for gas shut-off valves J908. The gas system can still be filled.This will deactivate the gas system and it prevents the leakage of larger amounts of gas through any possible leaks after the gas system has been filled.]
2. Drive to the petrol station in petrol mode.
3. Drive back to the workshop in petrol mode.
4. Before driving the vehicle into the workshop, reactivate natural gas mode by inserting the relay for gas shut-off valves J908 into the relay carrier. [Note: The fuel tank shut-off valves will be activated for only two seconds after the ignition has been switched on.During the activation, a mechanical »clicking« noise can be heard.During activation of the fuel tank shut-off valves, pay particular attention to noises coming from leaking gas in the section being repaired.If the injectors are not activated, perform an adaption drive to activate the gas system.To ensure successful results from the adaption drive, the engine must repeatedly be operated with partial load during the drive.To check whether the natural gas system has been activated successfully, consult the fuel gauge of the natural gas system]
5. ⚠ Risk of explosion and danger to life due to escaping natural gas.Leaks in natural gas system may lead to uncontrolled escape of natural gas.Risk of explosion leading to serious injuries or death.Check natural gas system for leaks.Do not perform any kind of work on the natural gas system if noises from leaking gas can be heard.If such noises can be heard, do not drive the vehicle into the workshop.Park the vehicle outside, and set up a safety area. — Set up a safety area, and observe safety precautions Safety precautions when working on vehicles with a gas system

6. Set the petrol mode using the function Release pressure in natural gas high-pressure line.
7. Wait until no noise from escaping gas can be heard.
8. Drive the vehicle into the workshop.
9. Loosen all threaded connections already loosened during repair work, and tighten them according to specifications.
10. Drive vehicle out of workshop.
11. Deactivate petrol mode using function Release pressure in natural gas high-pressure line.
12. Check if noise from escaping gas can be heard.
13. Drive the vehicle into the workshop.
14. Perform leakage test necessary after working on the high-pressure section , or the leakage test necessary after working on the low-pressure section Checking gas system for leaks after working on the low-pressure section.

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