TT Quattro Roadster L4-1.8L Turbo (AMU) (2002)
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Input "115" on keypad to select "Display group 115".
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Select "Q" button to confirm.
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Check Channels 3 and 4 of Display group "115" at full load acceleration in 3rd gear at 2000 RPM. Here the following can be seen:
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Channel 3 value = Target value of boost pressure according to programmed map in ECM.
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Channel 4 value = Actual existing value of boost pressure.
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Values should not deviate from each other by more than 50 mbar.
If values deviate (consistently) more than 50 mbar:
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Check Charge air pressure system (see Repair Manual Group 21 - Turbocharger, G - Charger).
A4, Cabriolet and TT models:
After road test:
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Let warm engine idle in warm surrounding.
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Switch OFF ALL consumers (A/C, seat heating, window defroster, etc.).
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Select the button.
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Input "003" on keypad to select "Display group 003".
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Select "Q" button to confirm.
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RPM, Air mass, throttle valve angle and the Advance angle are displayed.