Checking vacuum supply of fuel system diagnostic pump V144 — VW

🧭 Before you start

Fits: VW Golf V / Jetta (1K, 2003–2009), VW Golf VI (5K, 2008–2013); platform code 1F7

🔧 Engine codes this applies to

📐 18 workshop diagrams for AXQ

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Remove rear right wheel and wheel housing liner.
2. Disconnect vacuum line (1) from fuel system diagnostic pump V144.
3. Connect turbocharger testerV.A.G 1397A with T-piece and hose ∅ 6 mm, between vacuum line (1) and fuel system diagnostic pump V144(2).
4. Disconnect vacuum line (1) from fuel system diagnostic pump V144.
5. Connect turbocharger testerV.A.G 1397A with T-piece and hose ∅ 6 mm, between vacuum line (1) and fuel system diagnostic pump V144(2).

6. Switch on measuring range I (absolute pressure measurement).
7. Connect vehicle diagnostic tester and start engine.
8. On vehicle diagnostic tester, select operating mode Guided functions.
9. Select guided function "“Checking tank ventilation system for leaks”".
10. Initiate test.
11. Observe display on turbocharger testerV.A.G 1397A while test is running.
12. If pressure exceeds 0.7 bar during test, vacuum supply is too low. Check vacuum line to intake manifold for possible kinks or blockages.

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