AUX AUDI A8 1999 D2 / 1.G AHA Engine Intake Manifold Tuning System Workshop Manual

24-162

Vacuum system, checking for leaks


- Let engine run 2 to 3 minutes at idle (for vacuum
to build up).

- Switch ignition off.

- Remove 2-pin connector from intake manifold
tuning valve -N156- (change-over valve).

- Connect jumper wire (from VAG1594) from one terminal of -N156- to
engine ground.
- Use VAG1248/3A remote, adapter wire VAG1348/3-2 and auxiliary
wire to connect second terminal of -N156- to B+.
- Activate intake manifold tuning valve -N156-, using remote control
VAG1348/3A, for approx. 2 to 3 min.
The vacuum solenoid must remain actuated during this time.
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