Fuel Pressure Regulator: Testing and Inspection

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
LEXUS Hand-held Tester










INSPECTION PROCEDURE
OBD II Scan Tool (excluding LEXUS Hand-held Tester)