A6 Sedan V6-2.8L (ATQ) (2000)
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Connect one terminal of solenoid valve to engine Ground (GND) using an adapter cable and an alligator clip from VAG1594A connector test kit.
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Connect the second terminal of solenoid valve to B+ using VAG1348/3A remote control, VAG1348/3-2 adapter cable and assisting cable.
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Operate VAG1348/3A remote control for approx. 2 to 3 minutes. Vacuum diaphragm must remain activated during this time.
If the vacuum diaphragm moves back, check vacuum reservoir as follows:
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Disconnect vacuum hoses from vacuum reservoir for intake manifold change-over.
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Connect VAG1390 hand vacuum pump to vacuum reservoir.
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Operate hand vacuum pump and observe change-over procedure.
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Check vacuum reservoir for proper seal. (Vacuum reservoir must not return to rest position, as long as the hand vacuum pump is not vented.)
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Replace vacuum reservoir if necessary.
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If the vacuum diaphragm does not activate, check Intake Manifold Change-Over Valve -N156- for continuity as follows:
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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.
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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.
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Operate VAG1348/3A remote control.
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Check valve for throughput (disconnect vacuum hose and blow through).
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If necessary, replace intake manifold change-over valve.
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Check vacuum system for leaks if no malfunctions were detected for all previous tests.