toyota Workshop Repair Guides

Toyota Workshop Service and Repair Manuals

Diagram Information and Instructions|Page 2750 > < Diagram Information and Instructions|Page 2748
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Vacuum Switching Valve for Fuel Pressure Control: Description and Operation

PURPOSE

The fuel pressure vacuum switching valve is used to raise fuel pressure during hot restart conditions. 

OPERATION

During a hot restart, the engine control module energizes the vacuum switching valve which redirects the vacuum supply for the fuel pressure
regulator to the atmosphere. When the vacuum is vented, the fuel pressure regulator raises fuel pressure accordingly. 

Diagram Information and Instructions|Page 2750 > < Diagram Information and Instructions|Page 2748