Vacuum Control Valve (VCV): Corolla
- Start engine and run at idle speed. Disconnect vacuum hose from and connect vacuum gauge to port Z of VCV 1. Check that gauge indicates about 7.9 in. Hg. Reconnect hose.
- Disconnect vacuum hose from port Y and Z of VCV 2. Check that a small amount of air flows from port Z to port Y. Disconnect vacuum hose from port S. Check that air flow increases. Reconnect hoses.
- Disconnect vacuum hose from port S and Z of VCV 3. Plug port Z with finger and check that no vacuum is felt. Reconnect hose to port S. Vacuum should be felt momentarily. See Fig 1.
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