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Home >> Infiniti >> 2004 >> M45 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control System >> DTC P0127: IAT Sensor >> Diagnostic Procedure
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Diagnostic Procedure

  1. Check Ground Connections 
    1. Turn ignition switch OFF.
    2. Loosen and retighten two ground screws. Refer to GROUND INSPECTION .
      3. Fig 1: Identifying Engine Ground Wires
      G00795787Courtesy of NISSAN MOTOR CO., U.S.A.
    1. OK or NG 
    2. OK: GO TO 2.
    3. NG: Repair or replace ground connections.
  2. Check Intake Air Temperature Sensor 

    Refer to  2.

    1. OK or NG 
    2. OK: GO TO 3.
    3. NG: Replace mass air flow sensor (with intake air temperature sensor).
  3. Check Intermittent Incident 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    1. : INSPECTION END 
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