Checking turbocharger and charge pressure regulating valve - vehicles with electronic throttle — AUDI

🧭 Before you start

Fits: Audi A3 (8L, 1996–2003)

• Special tools named: VAS 5051, V.A.G 1397

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• To avoid accident risks when road testing the vehicle with test equipment, always observe the relevant safety precautions . — Take off engine cover panel (arrows).
• Connect up vehicle diagnostic, testing and information systemVAS 5051 with diagnosis leadVAS 5051/1, press vehicle self-diagnosis key and select vehicle system "“01 - Engine electronics”". Engine must be idling.
• The charge pressure should be measured using turbocharger testerV.A.G 1397 A. Vehicle diagnostic, testing and information systemVAS 5051 is used to check whether the charge pressure is being registered by the control unit.

🔧 Engine codes this applies to

📐 53 workshop diagrams for AGU

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

📋 Procedure

1. ⚠ To avoid accident risks when road testing the vehicle with test equipment, always observe the relevant safety precautions . — Take off engine cover panel (arrows).
2. Connect T-piece with test hose of turbocharger testerV.A.G 1397 A to intake manifold (front).
3. Route test hose under rear edge of bonnet and through right window into passenger compartment.
4. Switch on turbocharger tester and set measuring range selector switch to position (I) (absolute pressure).
5. Attach test hose to connection (I). [Note: Ensure absolute leakproof connection of hoses to avoid measurement errors.Take care not to trap test hose at bonnet and side window.Pressing memory button (M) on turbocharger tester causes last measured value to be stored until memory button (M) is pressed again or tester is switched off.The decimal point in the display flashes to indicate that the value is being stored.If the battery voltage of the turbocharger tester drops below the minimum level, an arrow will appear at the top left of the display.Before performing the test, drive vehicle moderately fast for at least 3 km (without stopping at traffic lights etc.).]

6. Connect up vehicle diagnostic, testing and information systemVAS 5051 with diagnosis leadVAS 5051/1, press vehicle self-diagnosis key and select vehicle system "“01 - Engine electronics”". Engine must be idling.
7. From the list (1) select diagnostic function "“08 - Read measured value block”".
8. Press keys 115 on keypad (2) to select "“Display group 115”" and confirm entry by pressing key Q.
9. Accelerate vehicle in 3rd gear from 2000 rpm at full throttle while a second mechanic observes the rev counter.
10. Have the second mechanic press PRINT key on VAS 5051 and memory key (M) on V.A.G 1397 A simultaneously at approx. 2500 rpm. [Note: The charge pressure should be measured using turbocharger testerV.A.G 1397 A. Vehicle diagnostic, testing and information systemVAS 5051 is used to check whether the charge pressure is being registered by the control unit.]
11. Accelerate vehicle in 3rd gear from 2000 rpm at full throttle while a second mechanic observes the rev counter.
12. Have the second mechanic press PRINT key on VAS 5051 and memory key (M) on V.A.G 1397 A simultaneously at approx. 2800 rpm. [Note: The charge pressure should be measured using turbocharger testerV.A.G 1397 A. Vehicle diagnostic, testing and information systemVAS 5051 is used to check whether the charge pressure is being registered by the control unit.]
13. Accelerate vehicle in 3rd gear from 2000 rpm at full throttle while a second mechanic observes the rev counter.
14. Have the second mechanic press PRINT key on VAS 5051 and memory key (M) on V.A.G 1397 A simultaneously at approx. 2800 rpm. [Note: The charge pressure should be measured using turbocharger testerV.A.G 1397 A. Vehicle diagnostic, testing and information systemVAS 5051 is used to check whether the charge pressure is being registered by the control unit.]
15. Press the ← key to exit from the function "“08 - Read measured value block”".
16. Press function "“06 - End output”".
17. Switch off ignition and detach diagnostic connector.
18. Find fault causes using fault table below.

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