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Home >> Infiniti >> 2004 >> M45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> DTC P0171, P0174: Fuel Injection System Function >> Diagnostic Procedure >> 5. Check Fuel Pressure
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5. Check Fuel Pressure

  1. Release fuel pressure to zero. Refer to FUEL PRESSURE RELEASE .
  2. Install fuel pressure gauge and check fuel pressure. Refer to FUEL PRESSURE CHECK .

    At idling: 350 kPa  (3.57 kg/cm2 , 51 psi)

OK or NG 

  1. OK: GO TO 7. CHECK MASS AIR FLOW SENSOR .
  2. NG: GO TO 6.