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3-Way Solenoid Valve (TWSV)

  1. Disconnect 2 vacuum hoses from Blue TWSV. Blow air into nozzle one. Air should come out nozzle 3 only. See Fig 1 .
  2. Disconnect TWSV connector and connect 12 volts to TWSV connector terminals. Blow air into nozzle one.
  3. Air should come out of nozzle 2 only. If TWSV does not operate as specified, replace valve.
Fig 1: Checking 3-Way Solenoid Valve
G61353Courtesy of GENERAL MOTORS CORP.
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