A4 Mk1
Charge air system with turbocharger
Testing air recirculation valve for turbocharger -N249
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Special tools and workshop equipment required
Note: The air recirculation valve for turbocharger -N249 and its wiring are monitored by the engine control unit.
=> Motronic injection and ignition system; Repair group 01; Interrogating and erasing fault memory If the display shows a fault relating to air recirculation valve for turbocharger -N249:
=> Motronic injection and ignition system; Repair group 01; Final control diagnosis |
→ Indicated on display: |
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The valve should click ... ... and open and close (can be checked by blowing into auxiliary hose). If the valve does not click:
If the valve does not open and close properly:
Testing internal resistance
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If the specification is not obtained:
If the specification is obtained:
Checking voltage supply Note: The air recirculation valve receives its voltage supply via the fuel pump relay. Test requirement:
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If the LED does not light up:
=> Current flow diagrams, Electrical fault finding and Fitting locations
If the wiring is OK:
If the LED lights up:
Checking activation |
=> Motronic injection and ignition system; Repair group 01; Final control diagnosis
If the LED lamp does not flash or if it lights up continuously:
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If the wiring is OK:
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