Service & Repair Manual

24-69
- Let vehicle run at idle for 2 to 3 minutes (vacuum
build-up).
- Switch ignition off.
- Disconnect connector from Intake Manifold
Change-Over Valve -N156-.
If the vacuum diaphragm moves back, check vacuum reservoir as
follows:
- Connect one terminal of solenoid valve to engine Ground (GND) using
an adapter cable and an alligator clip from VAG1594A connector test
kit.
- Connect the second terminal of solenoid valve to B+ using
VAG1348/3A remote control, VAG1348/3-2 adapter cable and assisting
cable.
- Operate VAG1348/3A remote control for approx. 2 to 3 minutes,
vacuum diaphragm must remain activated during this time.
- Disconnect vacuum hoses from vacuum reservoir for intake manifold
change-over.
- Connect VAG1390 hand vacuum pump to vacuum reservoir.
- Operate hand vacuum pump and observe change-over procedure.
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