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Home >> Chrysler >> 2003 >> Sebring Limited, 2.7 R >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.7L - Except Coupe >> Diagnostic Tests >> DTC P0125: Closed Loop Temperature Not Reached >> Testing

DTC P0125: Closed Loop Temperature Not Reached: Testing

WARNING: Never open the cooling system when the engine is hot. The system is under pressure. Extreme burns or scalding may result. Allow the engine to cool before opening the cooling system.
NOTE: If a Engine Coolant Temperature (ECT) DTC is set along with this code, diagnose the ECT DTC first. Inspect the ECT terminals and related powertrain control module terminals. Ensure the terminals are free from corrosion and damage. The best way to diagnose this DTC is to allow the vehicle to sit overnight outside in order to have a totally cold soaked engine. Extremely cold outside ambient temperatures may have caused this DTC to set.
  1. Check the coolant system to make sure that the coolant is in good condition and at the proper level. Is the coolant level and condition okay? If yes, go to next step. If no, inspect the vehicle for a coolant leak and add the necessary amount of coolant.
    2. NOTE: This test works best if performed on a cold engine (cold soak).
  2. Turn the ignition on. With the DRBIII® scan tool, read the ECT Degree value. If the engine was allowed to sit overnight (cold soak), the temperature value should be a sensible value that is somewhere close to the ambient temperature. If engine coolant temperature is above 180°F (82°C), allow the engine to cool until 150°F (65°C) is reached. Start the Engine. During engine warm-up, monitor the ECT Degree value. The temp degree value change should be a smooth transition from start-up to normal operating temp 180°F (82°C). Also monitor the actual coolant temperature with a thermometer. As the engine warms up to operating temperature, the actual coolant temperature (thermometer reading) and the Eng Coolant Tmp Deg in the DRBIII® scan tool values should stay relatively close to each other. Using the appropriate service information, determine the proper opening temperature of the thermostat. Did the thermostat open at the proper temperature? If yes, go to next step. If no, replace the thermostat.
  3. Turn ignition on. With the DRBIII® scan tool in sensors, read the Eng Coolant Tmp Deg value. If the engine was allowed to sit overnight (cold soak), the temperature value should be a sensible value that is somewhere close to the ambient temperature. If engine coolant temperature is above 180°F (82°C), allow the engine to cool until 150°F (65°C) is reached. Start the engine. During engine warm-up, monitor the ECT Degree value. The temp degree value change should be a smooth transition from start-up to normal operating temp 180°F (82°C). Also monitor the actual coolant temperature with a thermometer. As the engine warms up to operating temperature, the actual coolant temperature (thermometer reading) and the ECT Deg in the DRBIII® scan tool values should stay relatively close to each other. Is the thermometer reading relatively close to the DRBIII® scan tool ECT reading? If yes, test is complete. If no, replace the ECT sensor.
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