Checking charge pressure regulation: VW Golf IV / Bora 1.8 (AGN, AGU, AQA, ARZ, …)

🧭 Before you start

Fits: VW Golf IV / Bora (1J)

• Renewed: turbocharger

Don't miss

• To operate turbocharger tester Operating instructions.The hoses must be connected so that there is no possibility of leaks.Ensure that the pressure hose is not trapped between the bonnet and the body.

🔧 Engine codes this applies to

📐 46 workshop diagrams for AGN

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

📋 Procedure

1. The charge pressure is measured under full load, whilst driving or on a rolling road. Test duration per measurement max. 10 seconds.
2. Pull connecting hose between intake manifold and pressure regulator shut-off valve on intake manifold and using T-piece connect to turbocharger testerV.A.G 1397A.
3. Select measuring range l. [Note: To operate turbocharger tester Operating instructions.The hoses must be connected so that there is no possibility of leaks.Ensure that the pressure hose is not trapped between the bonnet and the body.]
4. Measuring charge pressure at full throttle: accelerate with full throttle from 2,000 rpm in 3rd gear or in 2nd driving range.
5. At 3,000 rpm press the memory button M on turbocharger testerV.A.G 1397A.

6. Pull connector (2) off charge pressure regulation solenoid valve N75(1).
7. Check hose from connecting pipe (between turbocharger and charge air cooler) via valve to pressure actuator for through flow.
8. Check pressure actuator for charge pressure regulating valve is securely mounted on turbocharger.
9. Check charge pressure regulating valve shaft mounting in turbocharger for ease of movement. If corroded (seized), renew turbocharger.
10. Check charge pressure regulation solenoid valve N75:
11. Press "“GoTo”" key.
12. Select "“Function/component selection”".
13. "“Select drivetrain.”"
14. Select "“Engine code”".
15. Select "“01-Systems capable of self-diagnosis”".
16. Select "“Engine management”".
17. Select "“Electrical components”".
18. Select "“Function or component”".
19. Select charge pressure regulating solenoid valve N75.

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