Air Control Valve A
- Disconnect hose number 15 (Prelude) from air control valve A. Connect a vacuum pump and apply vacuum. Disconnect the hose to the frequency solenoid valve A. See Fig 1 . Ensure air will pass through valve.
- Release vacuum. Check that air will pass through, even though some resistance may be felt. If air control valve tests as described, valve is okay. If there is no change in resistance, replace valve and retest.