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Auto. Trans. Models

  1. Disconnect the vacuum hose number 15 to vacuum switch C and connect a hand vacuum pump to the hose. Apply vacuum to switch.
  2. Check for continuity between Black/Yellow and Blue/Black wire terminals of control box 6P connector.
  3. Continuity should be available when a vacuum above 1.2 in. Hg is applied. If there is no voltage, replace the vacuum switch C and retest.
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