Switching Solenoid Valve
- Disconnect vacuum sensing tubes from switching solenoid valve and vacuum pipe. Blow through switching valve from vacuum sensing tube B in Figure. Air should pass through valve and escape from front port.
- Disconnect electrical connector from switching valve and connect battery power to terminals on valve. Blow through hose again; air should pass through valve and escape through filter at rear of valve. If switching valve does not respond as described, replace switching solenoid valve.