TGE/Troubleshooting 2JZ-GE — VSV Circuit for Fuel Pressure Control (Only for California spec.), page 101

EG-481

ENGINE — 2JZ-GE ENGINE TROUBLESHOOTING

VSV Circuit for Fuel Pressure Control (Only for California spec.)

CIRCUIT DESCRIPTION

The ECM turns on a VSV (Vacuum Switching
Valve) to draw air into the diaphragm cham-
ber 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 then engine is started.

FI6897

VSV
Pressure
Regulator
ECM
Injectors
To
Fuel
Intake
Tank
Manifold
(Return)
From Fuel Tank

WIRING DIAGRAM

Engine Control Module

B-R    3         B-R      1    2 W-L  36
>>EA3                              E9   FPU

GR       8
        >>EA1
                    VSV for Fuel
                    Pressure Control     E01
                                        B+
2    2
5    1
        R/B
3    2  No. 2
        EFI Main Relay
2    2

B-Y
2
R/B
No. 2
EFI No. 1
2A   W-B
B

Battery

GR           24
             E10   M-REL

FI6950