1990 Eagle Premier ESFACTORY OEM SERVICE PROCEDURE

Coolant Temperature Sensor Test

  1. Disconnect electrical connector from coolant temperaute sensor. Coolant temperature sensor is installed in thermostat housing. Using a DVOM, check resistance between ECU connector terminal "C10" to sensor connector and ECU connector terminal "D3" to sensor connector. See Fig 1 .
  2. If resistance is greater than one ohm, repair wiring harness. Measure resistance of sensor between sensor terminals. Refer to COOLANT TEMPERATURE SENSOR RESISTANCE  table. Replace coolant temperature sensor if not within specification.
    COOLANT TEMPERATURE SENSOR RESISTANCE (1)

    °F (°C) Ohms
    212 (100) 185
    160 (70) 450
    100 (38) 1600
    70 (20) 3400
    40 (4) 7500
    20 (-7) 13,500
    0 (-18) 25,500
    -40 (-40) 100,700
    (1) Values given are approximate.
    Fig 1: ECU Electrical Connector Terminal Identification
    G90D03222Courtesy of CHRYSLER MOTORS.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
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  • • You are missing required tools, torque specs, or safe lifting equipment.
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