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Home >> Infiniti >> 2010 >> FX50 >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System (VK50VE) - DTC U0101, U0113, U1003, U1001, U1024 & P0011 Through P0159 >> DTC P0128: Thermostat Function >> Diagnosis Procedure

Diagnosis Procedure

  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.

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