The antifreeze temperature sensor is installed on the water jacket of the engine cylinder block or cylinder head, in direct contact with the antifreeze, and is used to measure the temperature of the engine's antifreeze. The temperature sensor used in the antifreeze temperature gauge is a negative temperature coefficient thermistor (NTC), whose resistance decreases as the temperature increases. There is a wire connected to the electronic control unit ECU. The other is a grounding wire
What are the inspection methods for automotive temperature sensors?
1. Use a multimeter to check the antifreeze temperature sensor
(1) In vehicle detection.
. Turn off the ignition switch, remove the connector of the sensor, and use the Rx1 gear of a car specific multimeter to test the resistance value of the two terminals of the sensor. Taking the THW and E2 terminals of Crown 3. O as an example, the resistance is 4-7k Ω at a temperature of 0 ℃; At a temperature of 20 ℃, the resistance is 2-3k Ω; At a temperature of 40 ℃ for a time, the resistance is between 0.9-1.3k Ω; At 60 ℃, it is 0.4-0.7k Ω, and at 80 ℃, it is 0.2-0.4k Ω. The resistance value of the antifreeze temperature sensor is inversely proportional to the temperature (2) Single piece inspection. Remove the wire connector of the antifreeze temperature sensor and remove the sensor from the engine. Place the sensor in water in the beaker and heat the water in the beaker. As the temperature gradually increases. Use a multimeter to measure the resistance value of the sensor and compare the measured value with the standard value. If it does not comply, the antifreeze temperature sensor should be replaced
2. Detection of the output signal voltage of the antifreeze temperature sensor
Install the antifreeze temperature sensor and plug in the sensor connector.
. When the ignition switch is placed in the ON position, measure the output voltage between the connector "THW" terminal (Toyota) or ECU connector "THW" terminal in Figure 1 and E2. The measured voltage should vary inversely with the temperature of the antifreeze Remove the harness plug of the antifreeze temperature sensor, turn on the ignition switch, and measure that the power voltage of the cooling temperature sensor should be 5V3. Detection of the resistance value of the connecting wire between the antifreeze temperature sensor and ECU
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