Secondary Air Injection Combination Valve, Checking

Secondary Air Injection Combination Valve, Checking

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 procedure
- Perform a preliminary check to verify the customers complaint. General Diagnosis

Start diagnosis
- Remove the vacuum hose from the combination valve.







- Connect the hand vacuum pump to combination valve vacuum connection.







- Disconnect the Secondary Air Injection hose - arrow -.
- Inject a light air pressure into the in Secondary Air Injection hose to close the combination valve, (do not use compressed air).
- 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.

End of procedure.