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Home >> Infiniti >> 2011 >> M37 x >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P0153 >> DTC P0128: Thermostat Function >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK ENGINE COOLANT TEMPERATURE SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Replace engine coolant temperature sensor.

  2. CHECK THERMOSTAT

    Check thermostat. Refer to "INSPECTION ".

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Replace thermostat.

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