Fuel Pressure Control Circuit

FUEL PRESSURE CONTROL CIRCUIT

CIRCUIT DESCRIPTION



The ECM turns on a 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 approximately 120 seconds after the engine is started.

WIRING DIAGRAM






INSPECTION PROCEDURE

Toyota hand-held tester













OBD II scan tool (excluding Toyota hand-held tester)