Fuel Pressure Control Circuit

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 fuel 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

VSV For Fuel Pressure Control Circuit:

INSPECTION PROCEDURE
With TOYOTA hand-held tester













INSPECTION PROCEDURE
With OBDII scan tool (excluding TOYOTA hand-held tester)