Intake manifold flap change-over valve, checking: Notes

Special tools, testers and auxiliary items required 

Fig 1: Hand Vacuum Pump V.A.G 1390

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Hand vacuum pump V.A.G 1390
• Test box V.A.G 1598/22 (through my 1999)
• Test box V.A.G 1598/31 (from my 2000)
• Digital multimeter US 1119 (Fluke 83 or equivalent)

• Adapter set V.A.G 1594
• Wiring diagram