Checking operation and power supply of fuel pump: Audi (CFPA)

🧭 Before you start

Fits: platform codes S1, 2H

• Renewed: fuel delivery unit

Don't miss

• The fuel pump runs very quietly.
• First, make sure that 5-pin connector (1) is firmly seated. To do this, pull on connector without pressing locking mechanism. If connector was not inserted correctly, repeat functional check of fuel pump.

🔧 Engine codes this applies to

📋 Procedure

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

6. Switch off ignition.
7. Lower fuel tank until connectors on fuel delivery unit are accessible.
8. First, make sure that 5-pin connector (1) is firmly seated. To do this, pull on connector without pressing locking mechanism. If connector was not inserted correctly, repeat functional check of fuel pump.
9. Pull off connector (1).
10. Check contacts on plug and on fuel delivery unit for damage.
11. Check voltage supply against current flow diagram with multimeterV.A.G 1715.
12. ⚠ Fuel supply lines are under pressure! 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 pulling hose off connection. — Locate and eliminate open circuit referring to current flow diagram .
13. Remove fuel delivery unit.
14. Check that electrical wires between flange and fuel pump are connected.
15. Fuel pump is defective, renew fuel delivery unit.

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