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Home › Honda › 1983 › Prelude Automatic › Repair and Diagnosis › Engine Performance › System › Air Injection System › Component Testing › Vacuum Switch

Vacuum Switch

  1. Disconnect the vacuum hose to vacuum switch and connect a hand vacuum pump to the hose. Apply vacuum to switch.
  2. Check for voltage at the vacuum switch. Voltage should be available when a vacuum of above 2.4 in. Hg is applied. If there is no voltage, replace the vacuum switch and retest.
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