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VACUUM SWITCHING VALVE (For Engine Mounting): Inspection: Inspection

  1. INSPECT DUTY VACUUM SWITCHING VALVE (OPERATION) 
    1. Check the operation of the duty vacuum switching valve when positive battery voltage is applied to its terminals.
      Fig 1: Inspecting Duty Vacuum Switching Valve Operation
      GTY144632Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Positive battery voltage is not applied

      The air from pipe G flows out through pipes E and H.

      Positive battery voltage is applied

      The air from pipe F flows out through pipes E and H.

  2. INSPECT DUTY VACUUM SWITCHING VALVE (RESISTANCE) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 2: Identifying Duty Vacuum Switching Valve Connector Terminals
      GTY183180Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 19 to 21 Ω

      If the resistance is not as specified, replace the duty vacuum switching valve.