Combination Valve, Checking

Combination valve, checking

Recommended special tools and equipment






- VAG 1390 hand vacuum pump

Test requirements
- No leaks in vacuum lines or hose connections.
- Vacuum hoses not clogged or kinked
- Pressure hose for Secondary Air Injection (AIR) Pump Motor not clogged or kinked.

Test sequence

- Disconnect vacuum hose at combination valve (arrow) and connect the VAG 1390 vacuum pump.

Note: Do not use pressurized air for the following test!






- Disconnect pressure hose (arrow) at Secondary Air Injection (AIR) pump motor and blow air in with light pressure.

Combination valve must close.

- Operate vacuum pump.

Valve must open.

If combination valve does not open:

- Replace the combination valve.