Pressure Regulator Control Valve Test
- Disconnect vacuum hoses from control valve. Blow into valve port "B" and ensure that air passes out of valve through air filter port "C". See Fig 1 .
- Remove connector from control valve and energize control valve by applying 12 volts to switch terminal. Ground other terminal. Blow into valve port "B" and ensure that air passes out of valve through port "C". If not, replace control valve.