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PATH: Engine Cooling > Coolant Temperature Sensor > Testing Testing Animations and Tech Tips Click to view: Testing an ECT sensor 1. Check the instrument cluster fuse condition and replace as necessary. 2. Check the sender wire for damage and repair as necessary. 3. Unplug the sender electrical connection. 4. Attach one end of a jumper wire to the sender electrical connector and the other end of the jumper wire to ground. 5. If the gauge functions properly, replace the sender. 1. Remove the sensor from the vehicle. 2. Immerse the tip of the sensor in container of water. 3. Connect a digital ohmmeter to the two terminals of the sensor. 4. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration. 5. Repeat the test at two other temperature points, heating or cooling the water as necessary. 6. If the sensor does not meet specification, it must be replaced. Submerge the end of the coolant temperature sensor in cold or hot water and check the resistance Click to Enlarge Coolant temperature sensor wiring diagram Click to Enlarge Coolant temperature sensor temperature vs. resistance values Click to Enlarge 1. 2. 3. 4. Remove the ECT sensor from the vehicle. Immerse the tip of the sensor in container of water. Connect a digital ohmmeter to the two terminals of the sensor. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration. 5. Repeat the test at two other temperature points, heating or cooling the water as necessary. 6. If the sensor does not met specification shown in the temperature versus resistance chart, it must be replaced. 7. The sensor may also be checked in the vehicle. Unplug the sensor and attach a digital ohmmeter to the two terminals of the sensor. 8. Using a calibrated thermometer, compare the resistance of the sensor to the ambient air temperature. 9. Repeat the test at two other temperature points, heating or cooling the water as necessary. 10. If the sensor does not met specification shown in the temperature versus resistance chart, it must be replaced. The ECT sensor is usually located near the thermostat housing Click to Enlarge Using a thermometer, a DVOM and some jumper leads, check the resistance of the ECT sensor and compare your readings to those in the chart Click to Enlarge Submerge the end of the coolant temperature sensor in cold or hot water and check the resistance Click to Enlarge Engine Coolant Temperature (ECT) sensor wiring diagram Click to Enlarge Engine Coolant Temperature (ECT) sensor temperature vs. resistance values Click to Enlarge 1. 2. 3. 4. Remove the ECT sensor from the vehicle. Immerse the tip of the sensor in container of water. Connect a digital ohmmeter to the two terminals of the sensor. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration. 5. Repeat the test at two other temperature points, heating or cooling the water as necessary. 6. If the sensor does not meet specification, it must be replaced. Intake Air Temperature (IAT) and Engine Coolant Temperature (ECT) sensor wiring diagram Click to Enlarge ECT sensor temperature vs. resistance values Click to Enlarge 1. 2. 3. 4. Remove the sensor from the vehicle. Immerse the tip of the sensor in container of water. Connect a digital ohmmeter to the two terminals of the sensor. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration. 5. Repeat the test at two other temperature points, heating or cooling the water as necessary. 6. If the sensor does not meet specification, it must be replaced. Submerge the end of the coolant temperature sensor in cold or hot water and check the resistance Click to Enlarge Coolant temperature sensor wiring diagram Click to Enlarge Coolant temperature sensor temperature vs. resistance values Click to Enlarge 1. 2. 3. 4. Remove the ECT sensor from the vehicle. Immerse the tip of the sensor in container of water. Connect a digital ohmmeter to the two terminals of the sensor. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration. 5. Repeat the test at two other temperature points, heating or cooling the water as necessary. 6. If the sensor does not met specification, it must be replaced. Engine Coolant Temperature (ECT) sensor wiring diagram Click to Enlarge Engine Coolant Temperature (ECT) sensor temperature vs. resistance values Click to Enlarge PATH: Engine Cooling > Coolant Temperature Sensor > Removal & Installation Removal & Installation 1. Disconnect the negative battery cable and drain the engine coolant. 2. Disconnect the sensor electrical lead and unscrew the sensor. To install: 3. Install the sensor and tighten it to 17 ft. lbs. (23 Nm). Connect the electrical lead. 4. Connect the battery cable and fill the engine with coolant. Coolant temperature and oil pressure senders-4.3L engines Click to Enlarge Coolant temperature and oil pressure senders-5.0L and 5.7L engines Click to Enlarge Coolant temperature and oil pressure senders-7.4L engines Click to Enlarge Coolant temperature and oil pressure senders-6.2L and 6.5L diesel engines Click to Enlarge 1. Disconnect the negative battery cable. 2. Drain the cooling system below the level of the sensor and disengage the sensor electrical connection. 3. Remove the coolant sensor. To install: 4. Install the sensor and engage the electrical connector. 5. Refill the cooling system and connect the negative battery cable. 1. Disconnect the negative battery cable. 2. Drain the cooling system below the level of the sensor and disengage the sensor electrical connection. 3. To install: 4. 5. 1. 2. Remove the coolant sensor. Install the sensor and engage the electrical connector. Refill the cooling system and connect the negative battery cable. Disconnect the negative battery cable. Drain the cooling system below the level of the sensor and disengage the sensor electrical connection. 3. Remove the coolant sensor. To install: 4. Install the sensor and engage the electrical connector. 5. Refill the cooling system and connect the negative battery cable. 1. Disconnect the negative battery cable. 2. Drain the cooling system below the level of the sensor and disengage the sensor electrical connection. 3. Remove the coolant sensor. To install: 1. Install the sensor and engage the electrical connector. 2. Refill the cooling system and connect the negative battery cable. 1. Disconnect the negative battery cable. 2. Drain the cooling system below the level of the sensor and disengage the sensor electrical connection. 3. Remove the coolant sensor. To install: 1. Install the sensor and engage the electrical connector. 2. Refill the cooling system and connect the negative battery cable. PATH: Engine Cooling > Coolant Temperature Sensor > Operation Operation Animations and Tech Tips Click to view: A typical CTS circuit Click to view: A typical CTS circuit Click to view: A temperature/resistance chart About the coolant temperature sensor The coolant temperature sender changes resistance as the coolant temperature increases and decreases. The coolant temperature sensor is a thermistor (a resistor which changes value based on temperature). Low coolant temperatures produce high resistance (100,000 ohms at -40°F/-40°C) while low temperatures causes low resistance (70 ohms at 266°F/130°C). The sensor is mounted in the coolant stream and the ECM supplies a 5 volt signal to the sensor through a resistor in the ECM and measures the voltage. The voltage will be high when the engine is cold, and low when the engine is hot. By measuring the voltage, the ECM knows the engine coolant temperature. Coolant temperature sensor location Click to Enlarge The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the ECM. The ECM supplies 5 volts to the coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the ECM monitors a high signal voltage which it interprets as a cold engine. As the sensor warms (internal resistance low), the ECM monitors a low signal voltage which it interprets as warm engine. Engine Coolant Temperature (ECT) sensor location4.3L, 5.0L and 5.7L engines Click to Enlarge Engine Coolant Temperature (ECT) sensor location-7.4L engines Click to Enlarge The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the ECM. The ECM supplies 5 volts to the coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the ECM monitors a high signal voltage which it interprets as a cold engine. As the sensor warms (internal resistance low), the ECM monitors a low signal voltage which it interprets as warm engine. View of the Engine Coolant Temperature (ECT) sensor Click to Enlarge Engine Coolant Temperature (ECT) sensor location Click to Enlarge The coolant temperature sensor is a thermistor (a resistor which changes value based on temperature). Low coolant temperatures produce high resistance (100,000 ohms at -40°F/-40°C) while low temperatures causes low resistance (70 ohms at 266°F/130°C). The sensor is mounted in the coolant stream and the ECM supplies a 5 volt signal to the sensor through a resistor in the ECM and measures the voltage. The voltage will be high when the engine is cold, and low when the engine is hot. By measuring the voltage, the ECM knows the engine coolant temperature effects most systems the ECM controls. Coolant temperature sensor location Click to Enlarge The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the ECM. The ECM supplies 5 volts to the coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the ECM monitors a high signal voltage which it interprets as a cold engine. As the sensor warms (internal resistance low), the ECM monitors a low signal voltage which it interprets as warm engine. Engine Coolant Temperature (ECT) sensor location— 4.3L, 5.0L and 5.7L engines Click to Enlarge Engine Coolant Temperature (ECT) sensor location— 7.4L engines Click to Enlarge