Vacuum Switching Valve On-Vehicle Inspection

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	20°C (68°F)	37 to 44 Ω
1 - Body ground 2 - Body ground	20°C (68°F)	1 MΩ or higher

Check operation of the vacuum switching valve.

1. Attach a vacuum pump to port E and check that vacuum does not flow from the filter to port E.
   

   Text in Illustration

   *1	Port E
   *2	Filter





2. Apply battery voltage across terminals 1 and 2.
   

   Text in Illustration

   *1	Port E
   *2	Filter

3. Attach a vacuum pump to port E and check that vacuum flows from the filter to port E.
   If the result is not as specified, replace the vacuum switching valve.
   

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	20°C (68°F)	37 to 44 Ω
1 - Body ground 2 - Body ground	20°C (68°F)	1 MΩ or higher

Check operation of the vacuum switching valve.

1. When a vacuum of 67 kPa (500 mmHg, 19.7 in.Hg) is applied to port F, check that air flows from port E to the filter.
   

   Text in Illustration

   *1	Port E
   *2	Port F
   *3	Vacuum
   *4	Air
   *5	Filter





2. Apply battery voltage across terminals 1 and 2.
   

   Text in Illustration

   *1	Port E
   *2	Port F
   *3	Air

3. Check that air flows from port E to port F.
   If the result is not as specified, replace the vacuum switching valve.