Checking vacuum supply of fuel system diagnostic pump: VW Golf V / Jetta 2.0 (BGP, BGQ, CAWB, CBFA, …)

🧭 Before you start

Fits: VW Golf V / Jetta (1K, 2003–2009); platform code AJ5

🔧 Engine codes this applies to

📋 Procedure

1. Note safety precautions before beginning work .
2. Observe rules for cleanliness .
3. Remove rear right wheel.
4. Remove rear right wheel housing liner General body repairs, exterior66Wheel housing liner.
5. Disconnect vacuum line (1) from fuel system diagnostic pump V144.

6. Connect turbocharger testerV.A.G 1397 A with T-piece251 201 346 and 6 mm hose, between vacuum line (1) and fuel system diagnostic pump V144(2).
7. Switch on measuring range I (absolute pressure measurement).
8. Connect vehicle diagnostic tester(1) as follows:
9. Push diagnostic cable connector (2) onto diagnostic connection in driver footwell.
10. Start engine and run at idling speed.
11. On vehicle diagnostic tester, select operating mode Guided functions.
12. Select "“guided function”"Checking tank ventilation system for leaks.
13. Initiate test.
14. Observe display on turbocharger testerV.A.G 1397 A while test is running.
15. Check vacuum line to vacuum pump for possible kinks or blockages.

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