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Fuel Pressure Control VSV Circuit

CIRCUIT DESCRIPTION

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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 start-

ing.

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.

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DIAGNOSTIC CHART

DIAGNOSTIC

CHART

(See page EG–344).

EG–446

–ENGINE TROUBLESHOOTING CIRCUIT INSPECTION

Toyota 3VZ–FE User Manual

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