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Home >> Nissan-Datsun >> 2008 >> Sentra Base, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS U1000 To P0171 (MR20DE) >> DTC P0127 IAT Sensor >> Diagnostic Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Diagnostic Procedure

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

      Refer to "GROUND INSPECTION ".

      • <=: Vehicle front
      • Body ground (1)

    OK or NG 

    OK: GO TO 2.

    NG: Repair or replace ground connections.

    Fig 1: Identifying Body Ground
    G04925191Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK INTAKE AIR TEMPERATURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 3.

    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 ".

    : INSPECTION END