Checking function and voltage supply (engine codes CAVA, CAVB, CAVC, CAVD) — VW

🧭 Before you start

Fits: VW Golf V / Jetta (1K, 2003–2009); platform code 5M1

• Renewed: fuel delivery unit

Don't miss

• The fuel pump runs very quietly.
• On vehicles with auxiliary heater the connector and the fuel line of the metering pump V54 must also be separated.

🔧 Engine codes this applies to

📐 60 workshop diagrams for CAVA

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

📋 Procedure

1. Connect as follows:
2. Push diagnosis cable connector onto diagnosis connection in driver footwell.
3. Switch on ignition.
4. Press buttons on display one after the other for Vehicle self-diagnosis, Engine electronics and Final control diagnosis.
5. Press right arrow button on display up to final control diagnosis for fuel pump electronics. [Note: The fuel pump runs very quietly.]

6. Switch off ignition.
7. Remove bench seat General body repairs, interior72Rear seats; Removing and installing bench seat.
8. Pull connector off fuel pump control unit J538.
9. Check voltage supply between contacts (1) and (6) using multimeterV.A.G 1715.
10. Locate and eliminate open circuit referring to current flow diagram .
11. Remove cover (1) with fuel pump control unit J538(2) from fuel delivery unit.
12. First check that the connector (arrow) is fitted securely by pulling the connector without pressing the catch. If connector was not inserted correctly, repeat functional check of fuel pump.
13. Now pull off connector.
14. Check the contacts on the connector and on the fuel delivery unit for damage.
15. ⚠ Fuel supply line is pressurised. Wear eye protection and protective clothing to avoid possible injury and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection. — Pull fuel lines (1) and (2) off flange. Detach push-on connectors [Note: On vehicles with auxiliary heater the connector and the fuel line of the metering pump V54 must also be separated.]
16. Open locking ring using wrench T10202.
17. Check that electrical wires between flange and fuel pump are connected.
18. Fuel pump defective, renew fuel delivery unit .

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