Vacuum Sensing Switch Test
- On models with vacuum sensing switch, check continuity between terminals while applying vacuum of less than 19.4 in. Hg.
- If switch shows continuity (switch closed), replace switch. If not, apply more than 20.6 in. Hg vacuum to switch and recheck continuity. If no continuity is present, replace switch.
NOTE:
Between 19.4 and 20.6 in. Hg, switch may be either open or closed.