A4 Quattro Wagon L4-1.8L Turbo (ATW) (2000)
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By pressing the memory button "M" on the turbocharger tester, the last test value is stored until either memory button "M" is pressed again or
the turbocharger tester is shut off.
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A blinking comma in the display field indicates a value has been stored.
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An arrow appears in the top left corner of the display field if the turbocharger tester battery voltage drops below the allowed specification.
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Before testing, drive vehicle briskly for at least 3 km (approximately 2 miles) without frequent stops.
WARNING!
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Always use a second technician to take measurements via the VAG1397A turbocharger tester when test-driving vehicle for this test.
Vehicles with manual transmission:
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Accelerate vehicle in 3rd gear at full throttle from 2000 RPM and watch tachometer.
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At 3000 RPM press memory button "M" on turbocharger tester.
Specification: 1.37 - 1.47 bar (19.865 - 21.315 psi)
Vehicles with automatic transmission:
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Drive with selector lever in range 2.
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Accelerate to 3000 RPM and wait for transmission to shift into 2nd gear.
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Press accelerator pedal to kickdown position (transmission will not shift down at this vehicle/engine speed).
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At 4500 RPM, press memory button "M" on turbocharger tester.
Specification: 1.3 - 1.4 bar (18.85 - 20.30 psi)
Note: For vehicles with automatic transmission the boost pressure test may not always provide a definitive reading of proper boost pressure
regulation. If pressure readings are at the lower end of the specified range, measure boost pressure control via load signal.
All vehicles:
Note: If no boost exists and a rumbling sound is heard from the engine compartment, the causes are as follows:
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Charge pressure bypass valve malfunctioning.
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Vacuum line to charge pressure bypass valve leaking or disconnected.
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Boost pressure control (via load signal), checking
WARNING!
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Always use a second technician to take measurements via the VAG1397A turbocharger tester when test-driving vehicle for this test.
Note: If VAG1551 scan tool is not available, use VAG 1552 mobile scan tool instead.
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Unclip Data Link Connector (DLC) cover.