Checking fuel pressure when the engine is running (engine codes CCZA, CCZB, CDAA, CDAB) — VW

🧭 Before you start

Fits: VW Passat B6 (3C, 2005–2010), VW Passat CC (357, 2008–2012)

• Special tools named: VAS 6550/1, VAS 5052

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• Press in securing ring to release fuel line.
• Make sure that drain tap is closed and cut-off taps are open.

🔧 Engine codes this applies to

📋 Procedure

1. Remove bench seat General body repairs, interior72Removing and installing bench seat.
2. Remove cover (1) with fuel pump control unit J538(2) from fuel delivery unit.
3. First check that connector (A) is securely seated by pulling the connector without pressing the catch. The connector can cause a fault if it has not been fitted correctly.
4. ⚠ The fuel line is under pressure.Risk of injury to eyes and skin from fuel.Wear eye protection and protective clothing to avoid eye injuries and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully opening the connection point. — Pull off supply line (arrow) and catch escaping fuel with a cloth. [Note: Press in securing ring to release fuel line.]
5. Connect pressure testerVAS 6550 to fuel supply line with adapterVAS 6550/2 and VAS 6550/1.

6. Fit connector cableVAS 5051/66 to pressure testerVAS 6550 and to vehicle diagnosis and service information systemVAS 5052 B.
7. Make sure that drain tap is closed and cut-off taps are open.
8. Switch on pressure testerVAS 6550.
9. Connect vehicle diagnosis and service information systemVAS 5052 B to vehicle.
10. Select Guided fault finding in VAS 5052 B.
11. Carry out vehicle identification.
12. Using the GoTo button, select the following menu options one after the other:
13. Follow instructions on vehicle diagnosis and service information systemVAS 5052 B.

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