Vacuum Solenoid Valve Check
- Disconnect vacuum hose from solenoid valve. Remove vacuum solenoid valve connector. Blow through vacuum solenoid valve from connecting tube side and make sure that air passes through solenoid valve. See Fig 1 .
- Apply electrical power to vacuum solenoid connector. Blow through vent solenoid valve from vacuum supply side and make sure that air does not pass. If air passes through valve, replace unit.