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Air Injection: Testing and Inspection
1.
Remove
vacuum switch from vehicle.
2.
Connect a hand
vacuum pump and an ohmmeter to
vacuum switch.
3.
With 3.9 inches or less Hg vacuum applied, ohmmeter should indicate no continuity between switch terminals.
4.
With more than 3.9 inches Hg vacuum applied, ohmmeter should indicate continuity between switch terminals.