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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 357 (Engine Control System (DTC/Circuit Diagnosis) (4 Of 17)) >> DTC/Circuit Diagnosis >> DTC P0128: Thermostat Function >> Diagnosis Procedure - Late Production

Diagnosis Procedure - Late Production

WARNING: This page is about a different car, the 2019 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC PRIORITY 

    If DTC P0128 is displayed with DTC P0300, P0301, P0302, P0303, P0304, P0305 or P0306, first perform the confirmation procedure (trouble diagnosis) for DTC P0300, P0301, P0302, P0303, P0304, P0305 or P0306.

    Is DTC P0300, P0301, P0302, P0303, P0304, P0305 or P0306 detected?

    YES

    Perform diagnosis of applicable. Refer to DTC Description .

    NO

    GO TO 2.

  2. CHECK ENGINE COOLANT TEMPERATURE SENSOR 

    Check engine coolant temperature sensor. Refer to Component Inspection (Engine Coolant Temperature Sensor) .

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Replace engine coolant temperature sensor.

  3. CHECK THERMOSTAT 

    Check thermostat. Refer to Removal and Installation .

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Replace thermostat assembly. Refer to Removal and Installation .

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