Vacuum Switching Valve: Inspection

WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT VACUUM SWITCHING VALVE

Measure the VSV resistance.

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
1-2	37 to 44 Ω at 20°C (68°F)
1 - Body ground 2 - Body ground	10 kΩ or higher

If the result is not as specified, replace the VSV.

Fig 1: Measuring VSV Resistance

Check VSV operation.
1. When the vacuum is applied to the E port, check that air is sucked into the filter. If the result is not as specified, replace the VSV.
  
  Fig 2: Checking VSV Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery voltage across the terminals. When the vacuum is applied to the F port, check that air is sucked into the E port. If the result is not as specified, replace the VSV.
  
  Fig 3: Checking Air Is Sucked Into E Port
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002