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ECA 73 - No Code (Barometric Pressure Switch)

  1. Check for loose connectors, corrosion or damage at BP switch and ECA terminal 2H. Repair as necessary.
  2. Check continuity across BP switch. Continuity across switch should exist when 0-27.2 in. Hg is applied to switch. With 27.3-30 in. Hg applied to BP switch, there should be no continuity. If continuity readings are incorrect, replace switch.
  3. With 27.3-30 in. Hg applied to BP switch, check voltage at ECA terminal 2H. Voltage should read 0-2.5 volts. Release vacuum and voltage should increase to 12-14 volts. If voltage readings are not to specification, check for opens or shorts in wiring between BP switch Blue/Orange wire terminal and ECA terminal 2H. Repair as necessary. Go to ECA 76  .
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