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Home >> Infiniti >> 2008 >> FX45 >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (VK45DE) - DTC U1000 Through P0153 >> DTC P0128 Thermostat Function >> Diagnostic Procedure

Diagnostic Procedure

  1. CHECK ENGINE COOLANT TEMPERATURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 2.

    NG: Replace engine coolant temperature sensor.

  2. CHECK THERMOSTAT 

    Refer to "REMOVAL AND INSTALLATION ".

    OK or NG 

    OK: INSPECTION END 

    NG: Replace thermostat.

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