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Home >> Infiniti >> 2010 >> M45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P0159 >> DTC P0128 Thermostat Function >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK ENGINE COOLANT TEMPERATURE SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 2.

    NG: Replace engine coolant temperature sensor.

  2. CHECK THERMOSTAT

    Refer to "COMPONENT ".

    OK or NG 

    OK: INSPECTION END 

    NG: Replace thermostat.