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Home >> Infiniti >> 1993 >> J30 V6-181 3.0L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Description and Operation >> Basic Description Of Engine Control Systems >> Fuel Pressure Regulator Control System
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Fuel Pressure Regulator Control System

PURPOSE
The fuel "pressure up" control system briefly increases fuel pressure for improved starting performance of a hot engine.


Fuel Pressure Regulator Control Input And Output Chart:





OPERATION
Under normal operating conditions, manifold vacuum is applied to the fuel pressure regulator.


Vacuum Solenoid:




Fuel Pressure Regulator Control:





The vacuum supply hose has a control solenoid intersecting it. During hot engine start, with fuel temperature above 75°C (167°F), the Engine Control Module (ECM) energizes the ON/OFF solenoid connected to the manifold vacuum supply hose. The energized valve vents to the atmosphere. As a result, atmospheric pressure is applied to the fuel pressure regulator to increase fuel pressure.
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