Vacuum Control Valve (VCV)

Remove VCV valve. See Fig 1. Using a vacuum pump, apply 12 in. Hg vacuum to port "S". See Fig 2. Blow air into port "Y" and ensure VCV opens. Release vacuum. Blow air into port "Y" and ensure VCV closes. If valve fails to operate as specified, it must be replaced.

Fig 1: Location of VCV Valve

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Fig 2: Checking VCV Valve

Fig 3: Location of VSV Valve