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Air Switching System Test

  1. Remove air cleaner. Disconnect downstream air hose from switch/relief valve. Start engine. With engine coolant above 150°F (67°C), air should be coming from downstream air port of switch/relief valve.
  2. If air is coming from downstream port, go to SOLENOID KICKER CIRCUIT TEST  . If not, go to step 3).
  3. With air cleaner removed and engine running, disconnect vacuum line from air switch/relief valve. Connect a vacuum gauge to line. There should be no vacuum reading. If so, replace air switch/relief valve. If vacuum is present, replace CVSCC valve.
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