EG-595 ENGINE — 2JZ-GTE ENGINE TROUBLESHOOTING VSV Circuit for Fuel Pressure Control CIRCUIT DESCRIPTION The ECM turns on a VSV (Vacuum Switching Valve) to draw 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 en- gine start when it is warm. Fuel pressure control ends approx. 120 sec. after the engine is started. Fi6969 VSV Pressure Regulator ECM To Fuel Intake Tank Manifold (Return) From Fuel Tank WIRING DIAGRAM Engine Control Module B-R 5 >>EA2 B-R 1 2 W-L 73 FPU E9 GR 8 >>EA1 VSV for Fuel Pressure Control EO1 B+ 2 2 5 1 EFI Main Relay R/B No. 2 3 2 2 2 GR 24 M-REL E10 B-Y 2 R/B No. 2 EFI No. 1 2A W-B B Battery Fi6938