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Air Switching Operation

  1. Engine must be warm. Stop engine and disconnect downstream air hose from air switching valve. Start engine, noting time with stop watch. For first 70 seconds, no air should come from downsteam port of air switching valve. If okay, go to step  3. If air is emitted, check harness and connectors at CCC and air switching timer.
  2. If connections are good, connect voltmeter between ground and air switching vacuum solenoid feed wire (leave feed wire connected). If voltage is less than 1 volt and air comes from valve, replace air switching valve. If voltage is about 12 volts and air comes from valve, replace air switching timer.
  3. After 70 seconds following engine start, air should come from downstream port of air switching valve. If so, and driveability is still poor, replace CCC and retest. If no air comes from valve (and voltage at solenoid is less than 1 volt), check electrical connections.
  4. If connections are good, replace air switching timer. If voltage is above 12 volts and no air comes from downstream port, check vacuum hoses and source. If good, replace air switching valve and retest.
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