Method coolant temperature sensor

EFI car idling occurs when too high, too low, or dilute mixture of black smoke, bad cold engine failure, etc., we often think about the water to be measuredTemperature sensor, the sensor is installed in the engine water on the road, its internal structure is generally used negative temperature coefficient thermistor, the electricResistance will vary with the water temperature, water temperature rises resistance decreases, the resistance value of the resistor and the computer board internal temperature in series form letterRoad side, the side of the open circuit voltage between 4.7V-5V in general, old-fashioned computer board also useful for the 12V. With the change in the voltage value of the thermistorChange, the smaller the lower the voltage resistance, the use of this principle the temperature of the cooling water put into electrical signals supplied to the computer board, as the controlSystem according to engine temperature correction fuel injection, ignition timing and other control parameters of the main basis. Check Engine Cooling Temperature Sensor can be used inRoad and open circuit detection. 1, the road detection method: temperature sensor plugs are generally two lines, one is the signal return line blacksmithAnd the other is the signal line, first unplug the sensor plug, turn the ignition switch, the digital multimeter pen were inserted into two tables unpluggedPlugs at both ends, is displayed on the multimeter voltage should be between 4.7-5.0V, showing negative, interchangeable table pen, if there is no voltage or veryLow, check the wiring and computer board signal terminals are normal. Signal voltage is normal, plug it back in the plug, this voltage is decreased, then startDynamic engine operation, the voltage was observed with different temperature, the higher the voltage the lower the temperature, the higher the temperature the lower the voltage. If this is, Which can be considered the sensor is good. 2, open circuit detection method: Turn off the ignition switch, unplug Engine Temperature Sensor plug from the engineRemove the sensor with a digital multimeter electrical measuring sensor group files between two terminals and case resistance, the resistance should be as megohms or more. With a wildcarTable measuring sensor resistance between two terminals should have 20 kilohms or less resistance values, the water Engine Temperature Sensor probe is placed in a container filled with hot wateBrowser, the resistance varies with temperature, several commonly used models listed below coolant Auto Temperature Sensorresistance and temperature mapping table for reference

Test for most vehicles.