Checking tandem pump and fuel pump: VW Touareg I 4.9 TDI (AYH, BKW, BLE, BWF, …)

🧭 Before you start

Fits: VW Touareg I (7L, 2002–2010)

• Renewed: tandem pump or fuel pump

Don't miss

• After removing tandem pump pressure tester, tighten supply line or sealing plug to 27 Nm.

🔧 Engine codes this applies to

📋 Procedure

1. Connect tandem pump tester VAS 5187 to test connection for cylinder bank 1 (1) or to test connection for cylinder bank 2 (2).
2. Connect tandem pump tester VAS 5187 to test connection for cylinder bank 1 (1) or to test connection for cylinder bank 2 (2).
3. Remove fuel filter (see the separate procedure).
4. Connect tandem pump tester VAS 5187 to supply line for cylinder bank 1 (1) or to supply line for cylinder bank 2.
5. Install fuel filter (see the separate procedure).

6. Open cover (1) (if fitted) and connect diagnosis cable to diagnosis connection.
7. Start engine and run at idling speed.
8. Select operating mode "„vehicle self-diagnosis“" on vehicle diagnosis, testing and information system. Then select address word "„01 - Engine Electronics“" for engine electronics control unit J623.
9. Press diagnosis function "„08-Read measured value block“".
10. Enter "„display group 1“" using number block (key pad) and confirm entry with Q button.
11. Read engine idling speed in "„display zone 1“".
12. Increase engine speed to 1500 rpm.
13. Observe pressure indicated on pressure gauge. Specification: at least 7.5 bar.
14. Press ← key twice.
15. Press function "„06-End output“".
16. Renew tandem pump or fuel pump (see the separate procedure). [Note: After removing tandem pump pressure tester, tighten supply line or sealing plug to 27 Nm.]

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