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

Diagnostic Procedure

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  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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