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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
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

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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