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Home >> Infiniti >> 2018 >> QX30 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTC/Circuit Diagnosis) (2 Of 4) >> DTC/Circuit Diagnosis >> DTC P0128: Thermostat Function >> Component Inspection (Engine Coolant Temperature Sensor)
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Component Inspection (Engine Coolant Temperature Sensor)

  1. TEST INTERNAL RESISTANCE OF COOLANT TEMPERATURE SENSOR 
    1. Turn ignition switch OFF.
    2. Remove engine coolant temperature sensor.
    3. Check the resistance between coolant temperature sensor terminals.

      Temperature [ deg.C (deg.F)]

      Resistance (Ohm)

      +

      -

      Terminal

      1

      2

      20 deg.C (68 deg.F)

      3, 010 - 3, 220

      30 deg.C (86 deg.F)

      1, 950 - 2, 070

      40 deg.C (104 deg.F)

      1, 290 - 1, 370

      50 deg.C (122 deg.F)

      880 - 930

      60 deg.C (140 deg.F)

      610 - 650

      70 deg.C (158 deg.F)

      430 - 460

      80 deg.C (176 deg.F)

      310 - 330

      90 deg.C (194 deg.F)

      230 - 240

      100 deg.C (212 deg.F)

      170 - 180

    Is the measured value OK?

    YES

    INSPECTION END

    NO

    Replace coolant temperature sensor. Refer to Component Parts Location .