LAUNCH X431 GDS Sensorbox Manual
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and the temperature is in inversely proportion (negative temperature
coefficient), which shall be less than 1kΩ during warming up.
Independent testing:
Unplug the wire connector of coolant temperature sensor, then remove the
sensor from the engine; place the sensor into a breaker with water and heat
the water, then use the "Resistance measurement" to test the Resistance
between two terminals of coolant temperature sensor at different water
temperature. Compared the measured value with the standard value, if the
Resistance is not compliant with the standard, then the coolant temperature
sensor shall be replaced.
（2） Output signal voltage testing for coolant temperature sensor
After installed the coolant temperature sensor, plug the wire connector of
sensor, then switch ignition ON, test the output signal voltage between the
two terminals of wire connector. The tested voltage shall be in inverse
proportional with the coolant temperature. When disconnected the harness of
coolant temperature sensor, the voltage shall be about 5V if the ignition
switch is ON.
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