T100 Pickup 4WD V6-180.5 2959cc 3.0L SOHC (3VZ-E) (1993)
Vacuum Switching Valve: Testing and Inspection
INSPECTION
1. Check Vacuum Circuit Continuity In Vacuum Switching Valve (VSV) By Blowing Air Into Pipe
Testing Evaporative Emissions System Vacuum Switching Valve.
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Connect the VSV terminals to the battery terminals as illustrated.
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Blow air into pipe E and check that air comes out of pipe F.
Testing Evaporative Emissions System Vacuum Switching Valve.
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Disconnect the battery from the VSV.
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Blow air into pipe E and check that air does not come out of pipe F. If a problem is found, replace the VSV.
2. Check For Short Circuit
Testing Evaporative Emissions System Vacuum Switching Valve.
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Using an ohmmeter, check that there is no continuity between the terminal and the VSV body. If there is continuity, replace the VSV.
3. Check For Open Circuit
Testing Evaporative Emissions System Vacuum Switching Valve.