AUDI A8 1999 D2 / 1.G AHA Engine Intake Manifold Tuning System User Guide

24-163
If vacuum solenoid releases, check solenoid as
follows:

- Remove vacuum line from vacuum solenoid for
intake manifold change-over.

- Connect VAG1390 hand pump to vacuum
solenoid.

- Activate VAG1390 hand pump and watch
change-over process.

- Check vacuum solenoid for leaks.

Vacuum solenoid should not return to initial
position as long as vacuum is being applied by
hand pump.
If vacuum solenoid returns:

- Replace vacuum solenoid.
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