4-Port PVS

With engine coolant temperature above PVS calibration temperature, see PVS COLOR CODES CHART , disconnect vacuum hoses connected to top 2 ports (marked "D" and "M") of PVS. Connect a vacuum gauge to one port and a vacuum source to other port. There should be no vacuum reading on gauge. If vacuum is present, replace PVS valve. Reconnect top vacuum hoses. Disconnect bottom 2 vacuum hoses from PVS ports (marked "E" and "S"). Connect vacuum source to one port and vacuum gauge to other. Vacuum should be indicated on gauge, if not replace PVS valve. Reconnect vacuum hoses.