Fuel Pressure Control Circuit

CIRCUIT DESCRIPTION
The ECM turns on the VSV (Vacuum Switching Valve) to draw the air into the diaphragm chamber of the pressure regulator if it detects that the temperature of the engine coolant is too high during engine starting.
The air drawn into the chamber increases the fuel pressure to prevent fuel vapor lock at high engine temperature in order to help the engine start when it is warm.
Fuel pressure control ends approx 120 sec. after the engine is started.





WIRING DIAGRAM











INSPECTION PROCEDURE - TOYOTA hand-held tester











INSPECTION PROCEDURE - OBD II scan tool (excluding TOYOTA hand-held tester)