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Home >> Infiniti >> 2013 >> FX37 Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Control System - DTCS U0101 Through P0153) >> DTC P0128: Thermostat Function >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Infiniti FX50. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK ENGINE COOLANT TEMPERATURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: GO TO 2.

  2. CHECK THERMOSTAT 

    Refer to "REMOVAL AND INSTALLATION ".

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Replace thermostat. Refer to "REMOVAL AND INSTALLATION ".