Vacuum Switching Valve Assembly No. 1 (ES300)

1. Using an ohmmeter, check that there is continuity between each terminal. Resistance should be 33-39 ohms at 68°F (20°C). See Fig 1.
2. Check that air flows from port "B" to filter.
3. Apply battery voltage across terminals. Check that air flows from port "B" to port "A".
4. Repair or replace as necessary.

Fig 1: Checking Vacuum Switching Valve Assembly No. 1

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