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Nissan-Datsun
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2004
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Maxima SE, Automatic
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System - DTC
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DTC P0171, P0174: Fuel Injection System Function
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Diagnostic Procedure
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5. Detect Malfunctioning Part
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5. Detect Malfunctioning Part
Check the following.
Fuel pump and circuit (Refer to "
FUEL PUMP CIRCUIT
").
Fuel pressure regulator (Refer to "
FUEL PRESSURE CHECK
").
Fuel lines
Fuel filter for clogging
Repair or replace.