Combination Valve for Secondary Air Injection (AIR), checking function and proper seal
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The following procedure is used to test all combination valves.
Special tools, testers and auxiliary items required
- Hand vacuum pump
Test conditions
- Vacuum lines and hose connections free of leaks.
- Vacuum lines not plugged.
Test sequence
- Remove the vacuum hose from the Secondary Air Injection (AIR) Solenoid Valve N112 - 2 -.
- Connect hand vacuum pump V.A.G 1390 to combination valve vacuum connection - 1 -.
- Disconnect the Secondary Air Injection hose.
Fig 1: Connecting VAG 1390 To Secondary Air Injection Solenoid Valve N112 & Combination Valve Vacuum Connection
- Inject a light air pressure into the in Secondary Air Injection hose to close the combination valve. (do not use compressed air) - arrow -.
- The combination valve should close and seal. Air should not be able to pass through the combination valve.
- Operate the hand vacuum pump.
- The combination valve should open. Air should be able to pass through the combination valve.
If combination valve does not open:
- Replace the faulty combination valve.