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Home >> Infiniti >> 2012 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P0153 >> DTC P0128: Thermostat Function >> Component Inspection (Engine Coolant Temperature Sensor)

Component Inspection (Engine Coolant Temperature Sensor)

  1. CHECK ENGINE COOLANT TEMPERATURE SENSOR
    1. Turn ignition switch OFF.
    2. Disconnect engine coolant temperature sensor harness connector.
    3. Remove engine coolant temperature sensor.
    4. Check resistance between engine coolant temperature sensor terminals by heating with hot water as shown in the figure.
    Terminals Condition Resistance (kΩ)
    1 and 2 Temperature [°C (°F)] 20 (68) 2.35 - 2.73
    50 (122) 0.68 - 1.00
    90 (194) 0.236 - 0.260
    Fig 1: Checking Engine Coolant Temperature Sensor
    G08260187Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Replace engine coolant temperature sensor.

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