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Home >> Infiniti >> 2013 >> M56 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P0183 >> DTC P0128: Thermostat Function >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK ENGINE COOLANT TEMPERATURE SENSOR 

    Refer to "COMPONENT INSPECTION (ENGINE COOLANT TEMPERATURE SENSOR) ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Replace engine coolant temperature sensor. Refer to "EXPLODED VIEW ".

  2. CHECK THERMOSTAT 

    Remove and Check the thermostat. Refer to "REMOVAL AND INSTALLATION " and "INSPECTION ".

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Replace thermostat. Refer to "EXPLODED VIEW ".

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