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Home >> Infiniti >> 2004 >> I35 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> DTC P0128: Thermostat Function >> Diagnostic Procedure
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Diagnostic Procedure

  1. CHECK ENGINE COOLANT TEMPERATURE SENSOR 
    1. Turn ignition switch OFF.
    2. Remove engine coolant temperature sensor.
    3. Check resistance between engine coolant temperature sensor terminals under the following conditions.
      Fig 1: Checking Engine Coolant Temperature Sensor
      G00786596Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

    1. OK: INSPECTION END 
    2. NG: Replace engine coolant temperature sensor.
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