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Home >> Infiniti >> 2002 >> Q45 >> Repair and Diagnosis >> External Pages >> Different car >> Section 216 (Engine Control System) >> DTC P0171, P0174: Fuel Injection System Function >> Diagnostic Procedure >> 7. Check Mass Air Flow Sensor
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7. Check Mass Air Flow Sensor

WARNING: This page is about a different car, the 2004 Infiniti Q45. However, it is still accessible from the selected car via links, so may be relevant.

With CONSULT-II 

  1. Install all removed parts.
  2. Check "MASS AIR FLOW" in "DATA MONITOR" mode with CONSULT-II.
    1. 3.8 - 5.2 g.m/sec: at idling 
    2. 16.0 - 21.5 g.m/sec: at 2,500 RPM 

With GST 

  1. Install all removed parts.
  2. Check mass air flow sensor signal in MODE 1 with GST.
    1. 3.8 - 5.2 g.m/sec: at idling 
    2. 16.0 - 21.5 g.m/sec: at 2,500 RPM. 

OK or NG 

OK: GO TO 8.

NG: Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or grounds. Refer to DTC P0101 MAF SENSOR  .

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