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Home >> Infiniti >> 2006 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U1000 To P0159 >> DTC P0127 IAT Sensor >> Diagnostic Procedure

Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body.

      Refer to "GROUND INSPECTION ".

      Fig 1: Locating Body Ground Screws
      G04185036Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK : GO TO 2.
    2. NG : Repair or replace ground connections.
  2. CHECK INTAKE AIR TEMPERATURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    1. OK : GO TO 3.
    2. NG : Replace mass air flow sensor (with intake air temperature sensor).
  3. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    Refer to "WIRING DIAGRAM ".

    1. : INSPECTION END