Checking turbocharger and charge pressure control - vehicles with plug in intake manifold — AUDI

🧭 Before you start

Fits: Audi A4 B5 (8D)

• Renewed: turbocharger

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• The charge pressure should be measured using turbocharger testerV.A.G 1397A. Vehicle diagnostic, testing and information systemVAS 5051B is used to check whether the charge pressure is being registered by the control unit.

🔧 Engine codes this applies to

📋 Procedure

1. Unscrew plug (arrow) at intake manifold (front).
2. Screw adapterV.A.G 1318/11 into hole in intake manifold.
3. Connect adapterV.A.G 1318/11 to hose of turbocharger testerV.A.G 1397A using test hoses.
4. Route test hose under rear edge of bonnet and through right window into passenger compartment.
5. Switch on turbocharger tester and set measuring range selector switch to position (I) (absolute pressure).

6. 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.).]
7. ⚠ Accidents can be caused if the driver is distracted by test equipment while road-testing, or if test equipment is not properly secured.Observe safety precautions . — From menu (1), select diagnosis function "“Measured values”" and press → key to continue.
8. Press keys 11 on keypad (1) to select "“Display group 011”" and confirm entry by pressing Q key.
9. Accelerate vehicle in 3rd gear (or position 2) from 2000 rpm at full throttle while a second mechanic observes the rev counter.
10. Have the second mechanic press PRINT key on VAS 5051B and memory key (M) on V.A.G 1397A simultaneously at approx. 3000 rpm. [Note: The charge pressure should be measured using turbocharger testerV.A.G 1397A. Vehicle diagnostic, testing and information systemVAS 5051B is used to check whether the charge pressure is being registered by the control unit.]
11. Check display in display zone (3).
12. Check linkage and vacuum unit for charge pressure control .
13. Check charge pressure control solenoid valve N75.
14. Renew turbocharger .

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