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Warm Dr2 - Coolant Sensor

  1. Connect voltmeter negative lead to a good ground. Attach positive lead to cavity No. 12 of 13-way ECU connector. Turn ignition switch to "RUN" position. Voltmeter should read 0-1 volt.
  2. If okay, proceed to WARM DR3. If voltage was incorrect in step 1), turn ignition switch off. Unplug coolant sensor connector. Connect ohmmeter between sensor terminals. Ohmmeter should indicate 100-1000 ohms. If not, replace coolant sensor.
    Fig 1: View of ECU Connector, WARM DR1 - Coolant Sensor
    G2474Courtesy of CHRYSLER MOTORS.
  3. If resistance was okay in step 2), reconnect sensor connector. Disconnect 13-way connector from ECU. Connect ohmmeter leads to cavities No. 2 and 12. Resistance should be 100-1000 ohms. If resistance is okay, replace ECU.
    Fig 2: View of 13-Way Connector, WARM DR1 - Coolant Sensor
    G95729Courtesy of CHRYSLER MOTORS.
  4. If no resistance was found in step 3), repair open wires from coolant sensor to ECU.
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