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Vacuum Switch A

  1. Disconnect the vacuum hose number 2 to control box at vacuum hose manifold. Connect a hand vacuum pump to hose. Check for continuity between Black/Yellow and Brown/White terminals of the control box connector.
  2. Apply over 4.0 in. Hg. Continuity should not be present. If present, replace vacuum switch A. Release vacuum, there should be continuity. If not, replace vacuum switch A.
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