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Home >> Infiniti >> 2008 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS U1000 To P0308 >> DTC P0128: Thermostat Function >> Diagnosis Procedure
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Diagnosis 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

    Check thermostat. Refer to "REMOVAL AND INSTALLATION ".

    OK or NG 

    OK: INSPECTION END. 

    NG: Replace thermostat.

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