With Generic Scan Tool

Combination valve, checking

Recommended special tools and equipment







- VAG1390 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 hand vacuum pump (VAG1390).

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 combination valve.