Service & Repair Manual

24-70
- Check vacuum reservoir for proper seal.
(Vacuum reservoir must not return to rest
position, as long as the hand vacuum pump is
not vented.)
- Replace vacuum reservoir if necessary.
- If the vacuum diaphragm does not activate,
check Intake Manifold Change-Over Valve -
N156- for continuity as follows:
- Connect one terminal of Intake Manifold Change-Over Valve -N156- to
engine Ground (GND) using an adapter cable and an alligator clip from
VAG1594A connector test kit.
- Connect the second terminal of Intake Manifold Change-Over Valve -
N156- to B+ using VAG1348/3A remote control, VAG1348/3-2 adapter
cable and assisting cable.
- Operate VAG1348/3A remote control.
- Check valve for throughput (disconnect vacuum hose and blow
through).
- If necessary, replace intake manifold change-over valve.
- Check vacuum system for leaks if no malfunctions were detected for all
previous tests.
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