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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

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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