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Infiniti
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2004
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M45
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Repair and Diagnosis
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Engine Performance
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Engine Control System
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DTC P0171, P0174: Fuel Injection System Function
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Diagnostic Procedure
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7. Check Mass Air Flow Sensor
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With Consult-II
With Consult-II
Install all removed parts.
Check "MASS AIR FLOW" in "DATA MONITOR" mode with CONSULT-II.
3.8 - 5.2 g.m/sec: at idling
16.0 - 21.5 g.m/sec: at 2,500 RPM