Air Injection Bypass Valve: Testing and Inspection
Special tools, testers and auxiliary items8012 Hand vacuum pump (illustration shows V.A.G 1390)
Checking conditions:
Vacuum pipes and hose connections free of leaks.
- Vacuum lines not blocked-kinked.
- Remove sound dampening tray.
- Disconnect vacuum hose from combi-valve from Secondary Air Injection solenoid valve N112.
Connect US 8012 hand vacuum pump to combi-valve vacuum hose arrow->.
NOTE: Do not use compressed air during the following check!
Detach hose to combi valve at Air Cleaner upper section arrow-> and pressurize slightly by blowing into hose.
- combi-valve must be closed.
- Operate hand vacuum pump.
- combi-valve must open.
- If combi-valve does not open.
- Replace combi-valve.