ECU AUDI A4 1999 B5 / 1.G AEB ATW Engines Charge Air System With Turbocharger Workshop Manual
Page 2 of 42
21-47
Test sequence
If recirculation valve does not open or close or valve plate does not seal
correctly when valve is closed: - Attach VAG1390 vacuum pump to recirculation valve.
- Operate vacuum pump.
Recirculation valve must open (arrow)
- After approx. 30 seconds, operate vent valve on vacuum pump.
Recirculation valve must close (arrow)
- Replace recirculation valve. Secure connections of recirculation valve
using screw type clamps.
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