Checking charge pressure control — VW

🧭 Before you start

Fits: platform code 6N1

• Renewed: if necessary, turbocharger

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• Connect fault readerV.A.G 1551 and select engine electronics control unit with "“address word 01”". Engine must be idling.
• Faults are stored by separating the connector on charge pressure control solenoid valve N75. Therefore read and erase fault memory.

🔧 Engine codes this applies to

📐 16 workshop diagrams for AJH

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

📋 Procedure

1. The charge pressure is measured with fault readerV.A.G 1551 during a road test.
2. Pull connector (2) off charge pressure control solenoid valve N75(1).
3. Connect fault readerV.A.G 1551 and select engine electronics control unit with "“address word 01”". Engine must be idling.
4. Press buttons 0 and 8 for function "“Read measured value block”" and confirm entry with Q button.
5. Press buttons 0, 1 and 1 for "“display group number 11”" and confirm entry with Q button.

6. Indicated on display:
7. Accelerate vehicle in 3rd gear from approx. 1500 rpm using full throttle.
8. At approx. 3000 rpm, press PRINT button.
9. Check vacuum unit for charge pressure control valve, renew if necessary.
10. Check vacuum hoses .
11. Repeat charge pressure test.
12. Renew turbocharger.
13. Check charge pressure control solenoid valve N75. (Hose from turbocharger via valve to vacuum unit not blocked when connector is pulled off).
14. Check vacuum hoses .
15. Check vacuum unit for charge pressure control valve and operating rod, renew if necessary.
16. Check charge pressure control valve shaft mounting in turbocharger for ease of movement. If corroded (seized), renew turbocharger.
17. If measured charge pressure is OK, repeat charge pressure test with charge pressure control:
18. Charge pressure control solenoid valve N75 connector fitted. [Note: Faults are stored by separating the connector on charge pressure control solenoid valve N75. Therefore read and erase fault memory.]
19. Read fault memory .
20. Connect fault readerV.A.G 1551 and select engine electronics control unit with "“address word 01”". Engine must be idling.
21. Press buttons 0 and 8 for function "“Read measured value block”" and confirm entry with Q button.
22. Press buttons 0, 1 and 1 for "“display group number 11”" and confirm entry with Q button.
23. Indicated on display:
24. Accelerate vehicle in 3rd gear from approx. 1500 rpm using full throttle.
25. At approx. 3000 rpm, press PRINT button.
26. Check charge pressure control solenoid valve N75.
27. Check vacuum hoses .

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